Here are my basic requirements:

1. It has to be web based. I move between different computers and I want to see the exact same thing on all of them, so not Outlook.
2. It has to be able to import my Reader subscriptions.
3. It has to allow the option of looking at each feed separately (If I understand correctly Outlook basically throws everything into your inbox and I don't want something like that).
4. I don't need something with a mobile app or anything like that. I usually only access these from PCs.

here is my last xnode (LV2012) , "Select" ... but with n inputs. (100% polymorphic)

2 menus :

1) select mode : after&before , only after, only before

    select output : top , center

2) add input (after) , remove input

ouadji,

(for a quick test ... unzip ---> QUICK_TEST.vi)

                   I tried to use 5122 daq using ni scope for acquiring signal continuously. I attached the VI for this. But the is not fetching continuously.. To fetch continuously what are the modifications required?? Can anyone suggest?


                                                                            Thanking you,

                                                                                           Manu

I'm editing the VI Icon Template for one of my classes. It's simple with a colored header and text. I set the header to dark green in the editor and everything looks great.

When I close out of the editor, the actual icon color becomes brownish green. If I apply the template to all my methods, then my method icons also show brownish green. I verified it's actually a different color using the Dropper tool. But when I go back to look at it in the class's Icon Template editor, it's still dark green.

Anyone seen anything like this? Screenshot below.

I would like to use SQLite API to read and plot very large data. I have learnt how to select data from db, but I don´t know how to change range so that I couldn't stop the program. I have tried event structure, while loop, but nothing works.

Could anybody help me with that?

Thank you very much. 

I am trying to create an Update.vi for a lvclass but when I rt clk the lvclass select

 new> VI for Override... Update.vi

Update.vi does not appear in the menu

I took the CLD exam for my first time two weeks ago and I failed, due to a broken arrow. I know this is a very silly mistake with terrible consequences... Now I do not know why, but at the exam I did not give this issue the importance it takes, despite I have read about that in the forums...

The fact worries me most is that I could not complete the exam in these 4 hours, I try to do it as simple as I could (with a simple SM) but I left two states unprogrammed.. now I do not know why, (I think that the "to be under pressure factor" counted for that) but I thought that they were going to evaluate the programming despite of that thing, and the conlusion is that I ended failing the exam. Style: 12,5 points, Documentation: 10 points and Functionality: 1 point.

I hope reading of this case will prevent others to do this mistake, and me to learn and do it right the next time.

Despite all of that, I probably will take the exam again in three weeks, and I would want to know your advices. When I try the sample exams, I wasn´t able to finish them in 4 hours, I think I can´t code that fast at this point in my life, maybe with more experience on my back, but not today, so being aware of that, I decided to do the exam with the most simple architecture I could build, despite of the fact that I rather prefere the QSM because of his flexibility, I could not code the QSM that fast, and face the exam with a SSM.

So, maybe I have to learn quick-drops in order to improve my speed? 

I am commited in this time to do every sample exam in both SSm and QSM twice if posiible, timing myself and put here the answers in order the community can correct my mistakes.

I will be so grateful if anyone could indicate me where I could get aditional material (I have downloaded the Sample Exam Kit already)

or has any advice for my goal..

Thank you very much!!

I am trying to mark all post forum as read to have a clearer view on what is priori to my inscription and what is not... But I am failing at finding the option. 

Does this option exists and I am too blind to find it or not?

Thanks in advance

I am reading data from TCP Port and i have received ASCII Code data and i need to convert it into Hex.

so, kindly help.

I have attached sample ASCII Code Input and their Hex Output.

I have a problem getting variable form Göpel Boundary Scan DLL.

All my SW works fine except when I want to get a variable from the DLL.

The documentation from Göpel is here:

My LV(8.2.1) has this setup.

Am I doing something wrong?

Thanks in advance

/Bjarne Jørgensen

I am new here and Labview, sorry for my english wrongs. I am from Brazil.

Please help me

• Make the Messages public. Enforce encapsulation by "remembering" that the caller should never enqueue any of these messages.
   
• Set the Messages to community. Add the necessary friend relationships between Actors to allow the child Actor access. Don't really like using community scope in general because it feels hard to maintain.
   
• Put the child Actor class into the same LVLIB as the parent, so that they share access to the private messages. Show organization using virtual folders (one called "Messages for Parent" and the other "Messages for Child X" or similar). Concerned this could complicate things in ways I don't anticipate. For example, what if I want to create self-enqueued messages that are only available to the child Actor? Are these now automatically available to the parent?

Are any of these the right solution? What have others done in the past and is there an established best practice?

Thanks.
 

EDIT: I see this question has ]been answered here. It seems like a lot of overhead to create a protected message but I guess it's also the cleanest way to go.

            I am trying to find phase difference between two acquired signals. In this project I varies frequency of input voltage continuously using for loop and measure two output voltages corresponds to each frequency from my circuit. I need to find the phase difference between two voltages accurately. Here I used "frequency amplitude" vi.. but each time when I execute the program with same circuit for particular frequency, phase difference changes... Is there any other method suitable for this project to calculate phase difference... I attached my vi along with this post.

                                             Thanking you,

                                                    Manu

A warning would be much appreciated.

The updated information wrote in the file is "Keyboard got triggered key was: ##"

## is some number, and the line ends with a LF character

 

I want to write some code that can extract relationships between classes (some being processes and some being messages) and then feed that data into a tool to visualize the relationships in my application.  The end goal would be something like the http://www.visualthesaurus.com/.  Unfortunately, the software behind that tool starts at $5k.  I am hoping to find something a bit less expensive.  Has anyone found a solution they like?

thanks,

-John

I've been using XControls for several months and have slowly learned how they work largely via (1) random forum searches and (2) trial and error. Thus, my knowledge/understanding of XControls is fairly patchwork. The LabVIEW help and examples were illuminating in getting started, but lacking in a lot of concrete details.

I've mostly gotten by via changing as little as possible from the examples. When I've had to make big changes, I cross my fingers and hope it's not a problem. When it is, I'm in for lengthy debugging sessions trying to understand when Facade events are triggered, when I need to set the Data Change and Display Change boolean flags, etc.

Is there a document or perhaps a more involved XControl example that could clarify proper coding guidelines/style for XControls, as well as when to use different Facade events?

Thanks.

The tornado ripped through Moore, OK this afternoon.  16 miles north of our offices.  It's heartbreaking to watch the coverage. Preliminary report is EF4 or bigger.

Our CEO, Jim Kring, gave a talk at the Summit called “Connecting LabVIEW to Everything Else.” Jim discussed the business value of providing application programming interfaces (APIs) to all (or nearly all) components of software systems created using LabVIEW.  Jim demonstrated how API designs allow JKI to develop embedded instruments that can be controlled with a touchscreen, or via SCPI commands, or even from external Python code running on remote network machines (via TCP/IP). Treating APIs as a first-class citizen in the software design process ensures the software remains open and modular, and allows text-based and other external programming environments to control the system remotely – powerful stuff!  For the grand finale, Jim showed how these same APIs made it easy to control the system from an iPad tablet using the LabVIEW Data Dashboard.

If you missed the Summit, you can catch up on what you missed by watching the video of Jim’s talk below. You can also follow along with the slides below that.

Are you spinning your wheels trying to make your applications work with other non-LabVIEW systems? Do you want the Python guys at your company to love you? We can help. Give us a call and tell us the problem you need to solve. 

(The video is an hour long. If you don’t have time to watch it all, scroll down for links to the highlights.)

Direct Links to Video Highlights

2:00 – You are an API Designer
6:30 – Business Value of APIs
10:30 – Instrument APIs using SCPI
15:05 – Embedding LabVIEW Becoming More Practical
16:06 – Demo: LabVIEW-powered instrument with SCPI API
23:54 – SCPI API Implementation in LabVIEW (Outline & Demo)
31:20 – API Technologies
36:05 – Language Bindings, External vs. Internal APIs
42:26 – Demo: Calling into LabVIEW from Python
51:00 – APIs and Systems (Discussion)
57:50 – Touch / iPad interfaces to LabVIEW instruments (Overview)
58:50 – Demo: iPad interface to instrument

           I  am trying to acquire voltages from circuit. I got a waveform that I attached to this post. I just want signals from time .002 to .007 in that graph. For selecting particular sample, what will I do? I don't have enough knowledge in labvie... So please help me.

                   Thanking you,

                                  Manu

I have been dealing with the issue of determining the pose of an object following the: http://zone.ni.com/reference/en-XX/help/372916M-01/nivisionconcepts/spatial_calibration_indepth/

I have calibrated my camera system and tried to determine the Rotational matrix and Translation vector following the documentation (please see the attachments below saved for LV2011).

I have also calibrated my system with Matlab calibration toolbox and the focal distances and optical centers are basically the same (so the intrinsic calibration is correct). But the calculated Rotational matrix and Translation vector are correct in Matlab, but incorrect in Labview.

Could someone with more experiences pleas helpe me to understand what am I doing wrong? I think I am mis-interpreting the NI Vision documentation. But it is stated that the camera matrix and projection matrix (homography) can be used to determine the Rotational matrix and the Translation vector (homography matrix).

Thank you and best regards,

K

P.s.: The correct values should be approximately (Matlab results):

Translation vector [mm]

-84.665374 -67.225807 384.071521

Rotational matrix

0.003979 0.999874 0.015387
0.858000 0.004490 -0.513631
-0.513635 0.015246 -0.857873

If you have a diagram like this below, and you like to add a +1 here:

The result becomes like this:

Enough is enough, I can't live without this feature but I tweaked it so it actually works.

Or at least it seem to work, please feel free to test it.

Place the attached VI in the Plugin folder:

..\resource\dialog\QuickDrop\plugins

Update the Insert.vi plugin and add this Sub VI here:

 Insert_GuessInsertPoint.vi   12.23K   4 downloads

(I've updated this sub VI)

Did it work for you?

Cheers,

Mike

]]> Fri, 17 May 2013 12:54:54 +0000 http://lavag.org/topic/9313-how-do-i-move-the-axis-label-on-a-graph/ http://lavag.org/topic/16820-cursor-drag-error-on-intensity-graph/ Ok, so I found another interesting issue while programming today. This one took a while to debug and isolate the source of the problem.

So, the story goes like this. I was having this error in one of my projects, where I would drag a cursor on an intensity graph using my mouse, but every so often I would lose control of the cursor and it would drop wherever my mouse was hovering. This was abnormal function, because if you keep your mouse pressed down while dragging, you should be able to move a cursor around indefinitely.

I figured out that I could remedy the issue by disabling a section of code where I called the "write to spreadsheet file.vi" in the File I/O Pallette. After some debugging, I figured out that if the file path inputting to this VI was inside of a LabView project folder that was auto-populating, then the error was happening. When I turned off  the auto-populating setting forthe folder, the issue was gone.

So now I've figured out the source of this issue, but I don't understand why this relationship would occur. What does saving a file have to do with my cursors in an intensity graph. Shouldn't they be running on completely different threads?

Any help on this matter would be greatly appreciated.

 test_cursor_moving.vi   15.64K   6 downloads

The Linux-server will respond "OK" if the command is valid, and "ERROR" if it is not. The messages are variable length and not fixed length. My vi sends the command to the server when I first run the VI, but if I try to send another command, it doesn't send, nor does it receive any new data from the server.

Any help is appreciated!

 

I'm new here and actually working in a Localization Algorithm using LabView. I tried to extract walls contour from a simple floor plan to use it in my algorithm later. At first I thought doing it manually but then I realized there's a lot of high level VI's in Labview for computer vision. In example, "Extract contour" would give me the coordinates found in an image, so I wrote a simple piece of code to test it. But first, I need to select a ROI. I used "Rectangle to ROI" and added the imputs programmatically, but the Extract Contour VI doesn't accept it as a valid ROI and returns an error. I have absolutely no idea what's going on, because I create the same cluster that the info suggests as a valid input.

You can try my attached code to see the problem by yourself using any image.

Thanks in advance.

I have a strange problem with LV2012 SP1 f2.

I have an application which has a Getting Started Window (GSW), similar to that in LabVIEW, that allows basic operations (such as open project etc) to be performed. Whenever I do an action I launch another GUI and hide the GSW. Then when I am finished with the other GUI I re-show the GSW. Things work fine in the IDE, but in an executable when I re-show the GSW I get the window except with none of the contents drawn in. This includes the menu, static graphics and all buttons, as shown (i.e. missing) in the picture attached.

My code is really simple, I am just directly setting the FP.state property (to either hidden or standard), and it is obviously working as its doing what is should in the that the GSW is being hidden and then displayed.

I say things work fine in the IDE, well this is not exactly true, I have on some occasion seen "similar" behaviour where some of the contents of the GSW are not drawn.

I have tried several different things to force a re-draw, and I can get individual items to be redrawn if I update them, but this surely should not be necessary?

Had anybody seen similar behaviour before, or have any ideas what could be causing this?

cheers

n

I have a message object that carries a variant and this object gets sent via a user event. What I was seeing was "serious" (I know serious is relative but 10-20 ms) jitter in a loop parallel to the one actually sending data. This jitter was causing my DMA FIFO to overflow (It should be noted this parallel loop with the jitter introduced was running at a very fast rate already, 10 ms).

Using diagram disable structures, I finally narrowed down the cause of the jitter to be the sending of an object with a cluster in the variant. But, per my coworkers suggestion, I tried flattening the cluster to a string first and putting this string in the variant. I found if I flatten the cluster to a string, and put that string in the variant, the jitter issue went away.

Can anyone think of why this may be? 

produces the following symbol

I tried some other characters after the backslash. Some remain the same while some result in other pseudo-graphics.

It is new for me. Is these any description of such a behavior? And why does it happen?

Thank you

Basically, if I make a new selection on an enum or ring, while using the "set cell value" method on a table, error 1604 is generated.

I want to understand why this is happening and also be able to fix it.

I am experiencing some problems with the time scale of a Waveform chart. I am using LabVIEW 2012 SP1 on a Win7 PC.

The vi here attached updates the waveform every second and shows on the Y scale the seconds passed (modulo 60).

The graph seems to flow more quickly as the X scale. After 4 minutes and 35 seconds the graphs is shown full, but the X scale is 5 minutes.

What is going wrong here? Is there a problem with the code?

An additional question is why the difference of the current time - initial time gives: 1 hour, 4 minutes and 35 seconds while it should be only 4 minutes and 35 seconds?

Any hint is welcome.

After trying to find an answer to a issue I was having with Requirements Gateway last week and not finding a users group, I have created a Requirements Gateway User Group on the communities and I invite you all to join.  There isn't much content at the moment since it's still a bit of a fledgling.  Please join and add your content, questions, and tips.

You can join by going to https://decibel.ni.com/content/groups/requirements-gateway-users-group

See you there.

Wire Warrior

VI Package Manager 2013 is here! Click here to download it. VIPM 2013 continues the refinement and improvement of VIPM for LabVIEW teams and add-on creators.

This year’s update makes VIPM easier to use and maintain on multiple machines, adds new features suggested by users on the VIPM Idea Exchange, and brings the Mac version of VIPM up to date with the Windows build.

If you’re already a VIPM Pro user, your upgrade is either free or $349. For new purchases, VIPM Pro is still just $499. Of course, VIPM Free is always free for everyone.

Here are a few of the most important changes in VIPM 2013. For full details, read the release notes or just go to the download page to get started.

Package Building Improvements

• Support for .ctl files in the Functions palette. Now you can add controls/typedef’s to your package’s Functions palette. When you drop them on the block diagram, you’ll get a constant.
  
• Better Pre- and Post-build action handling. VIPM 2013 does a better job of handling pre- and post-build actions in error situations, and also prompts the user if they try to execute an action that’s disallowed in VIPM Free.
• Improvements to license file management for users who do their own custom license binding.

Repository Management Improvements

• Multiple Repository Management. Switch between multiple VI Package Repositories without leaving the Repository Manager window.
  
• Easier Package Publishing. Publish packages by dragging them from the VIPM Main Window into your Repository window.

VIPM Installer Improvements

• No more separate Run-Time Engine download. The Windows and Mac VIPM installers both contain the necessary components of the LabVIEW RTE, so installation is a breeze.
  
• Silent command-line install support. VIPM can now be installed silently from the command line, to enable automated installation.

Mac OS X version in sync with Windows

Until now, the latest version of VIPM for Mac OS X has been VIPM 2010. This release brings the Mac version back up to parity with its Windows cousin. Mac users can take advantage of everything VIPM has to offer:

• Repository Management
• Package Building
• VIPC File Creation
• …and more.

View the full article]]> Mon, 13 May 2013 14:13:25 +0000 http://lavag.org/topic/16811-jki-news-vipm-2013-now-available/ http://lavag.org/topic/16801-mass-compile-bad-vi/ Hey Guys,

I had to use mass compile first time in my life and now I'm wondering what some of the errors wants to tell me?! 

The VIs which are colored in the attached picture are definitely not broken, no broken arrow or were there any problems with them for now.

So, how to get rid of these errors? Or why do I get these?

Thanks

Sagi

Error 363507 - LabVIEW could not verify the authenticity of the server

Shown below, this code demonstrates the issue. The 'workaround'? Set the 'verify server' flag to false.

Shown at the bottom is a simple HTTPS connection to Google works no prob -- could this indicate a misconfiguration on my web service?

Any ideas? Thanks!

http://ardalis.com/when-to-comment-your-code

Yup, my post count is taking a hit today.

I am quite new with TestStand. I know how to develop a test sequence already. Now my project becomes more complicated with checking if it is the first test sequence to implement some extra task such as scan bar code for a set of test sample. What should I do to make this happen?

Thank you for your time!

Thang Nguyen

Name: JSON LabVIEW
Submitter: drjdpowell
Submitted: 04 Oct 2012
Category: General
LabVIEW Version: 2011
License Type: BSD (Most common)

JSON is a data interchange format (sometimes compared to XML, but simpler). There are multiple projects to create a JSON package for LabVIEW. This is yet another one motivated by this hijacked conversation originally about a different project to convert JSON into LabVIEW Variants.

This project uses a set of LVOOP classes to match the recursive structure of JSON, rather than variants. It allows conversation to and from JSON. All functionality is available through two polymorphic VIs: Set and Get. In addition to Get and Set VIs for common data types, one can also convert directly to or from complex clusters via variant-JSON tools.

Copyright 2012 James David Powell, Shaun Rumbell and Ton Plomp.

Click here to download this file

Is it possible to parse and evaluate a boolean expression stored in a string with standard LV VIs? I can't find anything..

Expression like this one: 1==2 && (2!=5 || 2 > 5)

I'm building a configuration xml-file with if-attributes for conditions:

<item name="xyz" if="{namespace:variable} == 3" />

The first step is replacing the variables within {} with actual values. This is the easy part. The hard part is to evaluate the results...

But this feature would be nice.  I was wondering if anyone had a method for invoking a menu item from a VI, and if anyone knew if/when this feature will be implemented?  I noticed there is a similar invoke method for an application, but this makes me think it won't work for a VI specific menu item.

So this is a bad example but I have a Help >> About Us menu item, how could I problematically call that as if the user pressed the menu item?  There are many, work arounds I just thought this would be one of the cleanest for my setup.

I have no idea why it is doing this but it is really annoying.  Especially since everything is in version control, I end up having to check the parent out just to save the project.

The reason given for the need to save the parent is 'Item moved within library'.

The parent class is in a lvlib.

I am running LV 12.0f3.

Any ideas?  Is there a CAR for this or am I just doing something wrong?

thanks,

-John

Because it doesn't update smoothly I would like to try another approach: determine the number of 'Recorded Result' actions in the entire sequence at initialisation.

However, I haven't found a way to accomplish that. I can get the names of the sequences in the sequence file, I can get the names of the steps in these sequences, but I can't retrieve the reference to the sequence that is called from the MainSequence.

Can anyone tell me how to accomplish this?

Greetings,
Bart

I have an existing program that calls quit LV function inside of it. After installing OpenG library, every time the program quits, there will be a ~30 seconds delay. Anybody else see this?

Thanks!

Bo

If you want to try a preview release, you can download it here:

https://jki.box.com/s/d3ux8pknhu39znpc0re8

It supports Package configurations, building, repositories and The LabVIEW Tools Network. All the same cool stuff that the Windows version has. The power of LabVIEW allowed us to use the same code base for both Windows and Mac versions which was pretty awesome.

Let us know if you have any issues.

Best Regards

Batimba

I'm currently working on the control of a machine that does a specific measurement while the sensor (composed of several strain gauges) slides along a sled.

I would like to acquire the sensor Data and to relate it to the position of the sled. The machine also has simple User inputs as Buttons and simple outputs as LEDs. The motors are controlled by relais which are connected to DOs.

I wanted to use the cRIO Wfm reference library for my project because it seems to be great at this task.

My current problem is that whenever I try to start a measurement, I get the error message

CompactRIO:  (Hex 0xFE4C) You have entered a data rate that is not supported by the selected module and oversample clock frequency.

As a matter of fact though, I know that the Delta sigma strain gauge modules support a sampling rate of 10.000S/s but I seem to get the error from the FPGA.

I'll attach my FPGA VI and the Measure VI (which is normally located inside a statemachine) for your reference. - all of them written in LV2012.

I also get the same error when Using the example VI provided in the RIO Wfm Library.

Thank you for reading and eventually helping

I've got a .NET assembly that was provided by a manufacturer that controls some hardware. We are calling the higher level .NET functions from Labview and they work. But we aren't getting acceptable performance for the high level calls, so we are trying to drill down into the lower level calls.

One of the .NET methods requires an ICollection<T> input, there in this case T is a channel object that is created elsewhere. The ICollection function is described the in the MSDN article: http://msdn.microsoft.com/en-us/library/92t2ye13

For reasons I don't really understand, Labview doesn't apparently support a constructor to ICollection. Something about Labivew not supporting calls to .NET generics, but I'd be lying if I said I understood that. But it seems like it should be possible to create a .NET assembly that creates a reference to an ICollection .NET object that can be passed to Labview. But I can't get it to work.

I've written a simple program that contains two methods. The first method GetUInt32 simply returns an input integer and was written as a test to see if I could write and assembly and call it from Labview. It works great.

The second method, GetICollection, is a test case to create a collection of UInt32 integers. Should be really simple, but it generates a compiler error. I suspect I'm doing something really basic incorrectly, but I'm at a loss to understand what. Can someone point me in the correct direction?

I'm developing an OpenCL add-on for Labview and the one issue that is really causing grief are unhandled exceptions in OpenCL kernels.  It is really easy for the end user to write an OpenCL kernel that goes outside the bounds of the memory that was allocated in Labview.  Unfortunately, there isn't really a way to prevent the user from doing this except warning them in the manual.

Accessing memory outside of what is allocated by Labview causes an Unhandled Exception in which causes Labview to just quit.

I've tried all sorts of stuff in C/C++: try/catch, __try/__except, enabling SEH exception handling, and trying SetUnhandledExceptionFilter.  

Does anyone know any tricks that can prevent Labview crashing on an Unhandled Exception?  

The next option is to write everything in C# and try out the error handling there, but OpenCL doesn't have a verified C# implementation at this point.

Thanks,

Austin

I connected the device on the counter and on the ground, considering that the USB6009 is "at high level" and that it can measure just on decrease

The problem is that for each input the counter "measures" 4 or 5 counts (not stable).

It does not depend on the reed, I also did a test with a simple switch.

Any idea how to solve this trouble?

thank you alot

GM 

This is my thought process:

1. Register for the VI Activation Event of the top level project.

2. Open a reference to newly selected VI.

3. Use the Register For Events node to register for the BD Selection Change on the VI ref that I just opened.

4. Perform my action on the new selection.

Seems like it'll work, but if I Click on the block diagram of a VI in edit mode i get the following error from the Register Events node 

Error 1027, Saying "For the requested operation, the reference cannot be reserved as requested, is in an improper reservation mode, or the execution state must be set to running or reserved."

I guess this isn't completely unexpected, it's not often you want to register for an event of a VI that's not running. This gets me thinking though, when will the BD Selection Change Event ever be used? You can't select something on the block diagram of vi that IS running, and you can't get events on a VI that ISN'T running.

Am I missing something? See attached scratch code.

I can't seem to find a way to do this easily, anyone know how?

~Jon

I need to control a vi sending event (keydown) from a different vi. Want I'd like to do is some kind of keylogger, so i want to cacth the keystroke,log it and then send it to the second vi.

I guess it's possible to do it with register events subvis.

• 7+ years’ experience in Labview (Must have worked end-to-end Architecture/Design/Test)
• DLL development in Labview
• Minimum 5+ years’ experience in hardware test/design environment.
• Solid EE skills
• Hardware Test experience
• Experience using test equipment (multi-meters, o-scopes etc.)
• Experience with sensors a big plus
• Project management experience is a big plus
• .Net, ActiveX, Vision, Motion, DAQ, instrument communication, TCP/IP, source code control, state machines
• TestStand experience is a plus
• C++/C# experience is a plus

Northwest Contract Services offers very competitive wages, a comprehensive Medical/Dental/Vision plan - 100% of premiums paid by NWCS , and a 4% Match 401K program. This opportunity is a long-term position with an opportunity for growth and sustainment. Qualified candidates will receive an immediate response.

Aaron Edgington

Northwest Contract Services

aaron@nwcontract.com

253-350-4980 (cell)

To get all LV developer in my team to use the same shortcuts, I push the same shortcuts to everyone, but how do you remember all the different shortcuts?

To solve that I made a small Quick Drop Practice application, feel free to play and modify it so it suites you.

And if you have time to improve it, upload your version :-)

How it works:

It reads your current QD BD Shortcuts, and adds them to an array.

It then opens an empty VI BD and asks you to drop a VI (e.g. Build Array), on the BD.

If you haven’t figured out the shortcut within 5 seconds, it shows the shortcut so you can memorize it.

After it find the right VI on the BD, it deletes it and moves to the next shortcut.

Have fun.

 QD-Practice.vi   62.03K   22 downloads

So, I include few VI-s with my test program (LabView 2012), LabVIEW Run-Time Engine 2012 f3 and Vision Run.Time Engine 2012.

An attempt to install in a blank Windows-XP computer resulted in such an error:

.\Distribution.cpp(2065): InstallerError 11004

Developer Error. Distribution contains invalid dependencies:

1. Product NI Vision Run-Time Engine 2012 SP1 ({5D9D2C64-6D70-44CB-860C-4C624A03D870}) depends on

    product with upgrade code {409BEFA9-EB3E-472F-AD77-271A4A1D5927},

    version [12.10.35.0,), language in {}

    which is not in the distribution.

2. Product NI Vision Run-Time Engine 2012 SP1 ({5D9D2C64-6D70-44CB-860C-4C624A03D870}) depends on

    product with upgrade code {CBA7EDB3-A142-43B6-B68B-A723624F1375},

    version [3.7.50,), language in {}

    which is not in the distribution.

3. Product NI Vision Run-Time Engine 2012 SP1 ({5D9D2C64-6D70-44CB-860C-4C624A03D870}) depends on

    product with upgrade code {5D6378B2-B24D-4AD6-5DA2-FAEFDB81A250},

    version [12.0.7.0,), language in {}

    which is not in the distribution.

Correct the distribution and try again.

<No Debug Message>

As I understand, more items must be included in the installer. But how can I understand which parts? Upgrade codes and versions without names of products are little confusing.

I would be very glad if someone teaches me how to decrypt such error messages. Thank you.

The Error:

-1073807360,Property Node (arg 1) in ...(my top level vi).vi

The Code:

Thanks for the help!

Notice how the noise spike is approximately at the 0.9 minute mark on the horizontal axis. However after about 40 seconds, the scale is no longer aligned with the grid and data.

Note the grid does follow the data. The behavior is perhaps better visualized in a video.

The code that updates the charts is really simple, I'm not fidgeting with property nodes or anything:

The VI in the middle simply extracts relevant data from the Data object that comes in as event data. The blue wire only contains state information so the the UI knows which data to extract to each chart, it doesn't contain refnums or anything like that which get operated on when the chart is updated.

Any ideas?

m

Does anyone know how to do this on the Mac?

How many years have we preached to users, "Do NOT ever click on links that go to websites you do not trust? Avoid websites that redirect you to new servers?" Well, that's exactly what bit.ly does, and it relies upon the security blindness of most of the populace to be a viable system. The advantage of a bit.ly link is all in the market tracking -- it allows a website to hand out different bit.ly masks to different media outlets and then track which URL is the most used for getting back to the site.

But how do I know that this funky bit.ly URL, with its garbled characters, is actually going to the reputable URL that it claims to be going to? I can't. So, frustrated, I have avoided clicking on many links. But I've found a workaround. You can do this...

tl;dr:

Take the bit.ly URL and add a + to the end of it. This brings up the statistics page for that bit.ly link AND it displays the real URL that the link goes to. Then you can copy/paste that real link into your browser or, if you don't mind the tracking, you can go remove the + and let bit.ly do the redirect for you.

Annoying, but at least straightforward.

I've been running into a bizarre issue with some actors.

Below are some YouTube links that explain the basic purpose of my code and demo the problem. I've also included some text that describe the issue.

VIDEO:

1. Config Demo: Shows how Config Manager works and its basic purpose.
   

2. Config Crash: Demonstrates the crash bug.

3. Config Code: Shows the basics of the Launch and Stop code.

TEXT DESCRIPTION:

I have a Controller actor which I launch from my GUI. This Controller actor launches 6 nested actors, each with its own purpose. When the Controller finishes its operations, it calls Send Normal Stop to all 6 nested actors (from within its own Stop Core).

I built the Controller using demo launching and shutdown code, then moved the launch/shutdown code into my real application's GUI.

When in the demo, everything started up and shut down with no problems.

When I moved it into the application GUI, I can observe every Actor's Stop Core being called as expected (via breakpoints). But if I then stop the main application, I find that the Controller code and nested Actor code is locked, as though something is still executing. I also can't close the project, because something is still running.

After running the main application once, I can try running it again. The application starts as normal - but calling the Controller actor again causes LabVIEW to crash completely! It's a memory Access Violation, though the exact hex code changes.

WHAT I'VE TRIED:

I wrapped the demo launch/shutdown code into subVIs and dropped them into my main application to ensure the code was as similar as possible. But the demo runs perfectly and shuts down cleanly, while the main application does not.

I have verified with breakpoints that the Stop Core of every Actor is reached.

I have verified with breakpoints that all parallel UI loops in Actor Core overrides are stopped.

Today I will work on checking the condition of all stopped Actors using Handle Last Ack. This will involve some changes, because right now my Controller sends out the Stop Core message to all nested Actors only RIGHT BEFORE shutting itself down.

Any other suggestions for things I can try in debugging? Or anyone seen anything similar and can point to what might be causing the Actors to hang?

Thanks.

I want to display few items in the combobox in ascending order.

A small problem but do please help..

Thanks in advance.

This took me about 4.5 hours (though I had to pause overnight at 2.5 hours). I didn't do any planning at all: code-and-go all the way.

The UI is the only actor. I really wanted to make the file I/O an actor of its own, as well as a countdown timer (so their FPs could be shown during DEBUG==True), but I'm not THAT fast. Overall, I'm happy with it, for the time spent. Comments are welcome.

 my ATM AF Solution.zip   703.71K   44 downloads

my issue is described in much more detail here http://forums.jki.net/topic/2103-rename-vi-dependencies

i think that most of my issues can be solved by implementing this http://ideas.jki.net/topic/167846-rename-dependencies-without-renaming-package-files/

Thanks!

I can't even run the uninstaller to try a fresh installation because apparently the uninstaller needs a copy of the Run-Time Engine present as well.

Any suggestions?

At present i have one main vi that generates a signal and i've collected waveform data and displayed this data on a a chart. The web service uses a static folder containing html and javascript files. The html file calls the js file which parses the waveform data and returns to html to be stored as a chart_div. I have all the controls and indicators in one VI, connected by terminals using GET method.

I am looking for a way of scripting a request form so that when called by the html file, the client user can input a control and change the values on the waveform graph. I also have an update button that requests updated data. 

If anyone could suggest a method of how to accomplish this it would be SO helpful

Thanks, Chris

Any help or advice would be most appreciated.

Thanks

]]> Mon, 29 Apr 2013 14:04:38 +0000 http://lavag.org/topic/9250-getting-labview-scripting-out-of-the-shadows/ http://lavag.org/topic/16772-incorrectly-claimed-lvclass-ctl-files/ Hello all,

I have some classes that inherit form a parent class. All these lvclass' ctl files (including the parent's) report "incorrectly claimed by a library". Now I noticed the NI report classes (NI_HTML, NI_Standard Report, and NI_report.ctl) report the same on their ctl files. Is this 'normal' behaviour that I can safely ignore?

Thanks & greetings,

Bart

Enable may be a bit unique being an NI Alliance Partner and Mobile App development house. However, I thought I'd ask and see if anyone else plans to be there.

Might be great to share thoughts on LabVIEW / App interfacing.

Turns out we got lucky, and secured 2 tickets to WWDC 2013 before they sold out in 2 minutes.

Ben

Some one have idea?

Thanks

I' d like to display an intensity graph with a non linear and non regular X-scale, in other words an X-scale with time dicontinuities (see image in attachment).

I have a solution by adding a slide above the X-scale, but as I have to manage cursors, is' not very easy.

I'd like to know if someone has a better solution...

Thanks in advance

Mathilde

I have a LabVIEW real time based application.

Currently I am using PXI 8108 in RTOS mode with following cards:

1. PXI 6259

2. PXI 6514

3. PXI 6723

4. PXI 6608.

While running my Real Time exe (developed using LabVIEW) in RT 8108, the CPU usage is 8-10%.

I am not using any timing and synchronization feature of PXI.

Can I use a high quality desktop PC converted as real time target along with PCI cards for this application? will there be any issue related to performance?

Thanks.

Himan

I would like to create some  algorithm or function for automatic peak detection from ECG signal, but here is the problem because I don´t know how to start. I have detected peaks thanks for cursor, but now I would like to create something new. 

Is here anybody who has any idea? 

Thank you very much.

I'm trying to figure out how to keep a semaphore reference persistent in memory so it doesn't get destroyed.

At first I had the semaphore reference inside the Actor's private data and that was fine. I could throw the reference into the Actor data and retrieve it at will, no problems. It was never destroyed as long as the Actor was running.

Today I moved the semaphore reference into a File IO class and dropped an instance of File IO into the Actor private data. This led to immediate problems when I tried to re-run my code; the reference would get destroyed and I would get 1111 errors. I tried Obtaining the reference directly in one of the Actor methods and then feeding it into the File IO object via an accessor method, but this didn't improve the result.

I'd like to have the semaphore in the File IO class; that's where it makes the most sense to have it. That way restricting and releasing access to my data file is handled entirely in the File IO class. But the semaphore reference drops out of memory if it's not directly in the Actor private data (rather than bundled in an object that is then stored into the Actor data).

Any suggestions? I haven't used semaphores extensively, so if I'm misunderstanding the root problem, clarification would of course be greatly appreciated.

Iv'e been able to simulate data via a waveform indicator using a simple simulate signal vi, but i can't seem to find a solution anywhere that will allow me to extract and display points from a signal from within a simulation loop.

I've tried using the indexer funtion which seems to be limited and using the collector funtion which I am struggling to get to grips with.

If anyone could help me find a solution or give me advice on how to go about solving this problem I would appreciate it so much!

Thanks, Christian

Get Data Name.vi
 
Returns the name of the data wired on input.
 
Please visit http://www.OpenG.org to learn about the Open Source LabVIEW software movement.
 
NOTICE -- YOU MUST LEAVE THIS NOTICE IN PLACE.  PER THE TERMS OF THE LICENSE BELOW, YOU MAY SUBLICENSE THIS SOFTWARE IN ANY WAY THAT DOES NOT CONFLICT WITH THIS LICENSE.
 
### BSD License (http://www.opensource.org/licenses/bsd-license.php) Begin ###
 
Copyright © 2002, Jean-Pierre Drolet <drolet_jp@hotmail.com>
Copyright © 2002-2006, Jim Kring <jim@jimkring.com>
 
All rights reserved.
 
Redistribution and use in source and binary forms, with or without modification, are permitted provided that the following conditions are met:
 
    * Redistributions of source code must retain the above copyright notice, this list of conditions and the following disclaimer.
    * Redistributions in binary form must reproduce the above copyright notice, this list of conditions and the following disclaimer in the documentation and/or other materials provided with the distribution.
    * Neither the name of SciWare, James Kring, Inc., nor the names of its contributors may be used to endorse or promote products derived from this software without specific prior written permission.
 
THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
 
### BSD License End ###

Please visit http://www.OpenG.org to learn about the Open Source LabVIEW software movement.
 
NOTICE -- YOU MUST LEAVE THIS NOTICE IN PLACE.  PER THE TERMS OF THE LICENSE BELOW, YOU MAY SUBLICENSE THIS SOFTWARE IN ANY WAY THAT DOES NOT CONFLICT WITH THIS LICENSE.
 
### BSD License (http://www.opensource.org/licenses/bsd-license.php) Begin ###
 
See VI Description for Author information
 
All rights reserved.
 
Redistribution and use in source and binary forms, with or without modification, are permitted provided that the following conditions are met:
 
    * Redistributions of source code must retain the above copyright notice, this list of conditions and the following disclaimer.
    * Redistributions in binary form must reproduce the above copyright notice, this list of conditions and the following disclaimer in the documentation and/or other materials provided with the distribution.
    * Neither the name of OpenG, nor the names of its contributors may be used to endorse or promote products derived from this software without specific prior written permission.
 
THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
 
### BSD License End ###

I was wandering if it would be a good idea to have the "variant to data" behave the same way, instead of returning an error 91, shouldn't it try and see what does match between the data available in the variant and the data type passed to the "Variant to Data" primitive?

I find it not easy to explain what I mean so here's an example :

And here's the code.

 my variant to data.zip   52.65K   20 downloads

I know there are some limitations, not all data type are supported (refnums, arrays, waveforms, etc...) and unique names are required.

If someone wants to know when this can be useful, the answer is this : when you develop custom steps for VBAI and you want to add some parameters without losing all the ones that were already there.

Maybe there are other use cases for this?

Any feedback will be much appriciated.

I’m looking to recreate this line of C code in a similar manner in LabVIEW. Any contributions are greatly appreciated, thanks.

sscanf(aline, "%d%*1c%1c%1c%*1c%2c%*1c%f%f%d%f%f%*1c%5c%*1c%3c%*1c%5c%*1c%5c", &ic,c1,c2,comm,&axial,&radial,&angular,&efbhs, &holdinch,rext,amppercent,testcode,iac)

below are three sample data strings that this function can read:

    626        8.45  2.03 226 0.04  0.00           2    13.01   626
    627 C      8.47  1.30 293 0.10  0.00  1.00     27            0
    628 C      8.48  1.32 296 0.12  0.00  2.00     28   13.01    1

If Child 1 is in the middle of running Method A and Child 2 ALSO wants to run Method A, then what happens?

Does Child 2 have to wait until Child 1 is done running Method A?

Or did Child 2 get its own copy of Method A, thus making methods inherited from a parent "semi-reentrant"?

Left mouse button dragging moves the curtain; right mouse button dragging cuts through the curtain.

The power and simplicity of the software engineering tech stack shown here is.... beautiful. Inspiring.

(tested in Chrome and IE10; YMMV for <IE10)

I have a problem after compilation an application. RFSA and RFSG are working in same While Loop which stops on Error, controls have their own While Loop which stops when button "Ready" is pressed (see attached files). It was done for preset some controls. After starting Application and setting one(!) control the VI seems to be hang... I can't set any other control. Help pls...

P.S. sry for my English

I have seen in rare occasions (where I was messing with memory in ways I shouldn't) that caused the quit function to take up to a minute to actually exit.  What does this quit primitive do?  Why does quitting take longer than it should?  As a test I replaced the Quit LabVIEW, with a task kill operation on the EXE name.  Now when I hit the close button my application does the clean up on each Actor as it should, and then kills the program.  This operation now feels instant.

So is there something wrong with killing my program my way, after all logs have been closed, and hardware sessions closed?

EDIT: Okay so a search with Killing LabVIEW brought up this work around for killing an Actor based EXE.  So does this mean there is nothing wrong with killing other LabVIEW EXEs using this method?

A) Yes

B) No

C) <Head banging against wall> Thump…Thump…Thump...

D) All of the above

I need to control up to 32 serial port devices (RS232) using Labview.

Can any body recommend a product that will do this?

I have been looking at Terminal Servers (e.g. http://www.perle.com/products/Terminal-Server.shtml)

Does anybody know if I can use this device with Labview to access each RS232 device.(NB: I can currently access each device using TeraTerm).  The recommended retail price for a 16port unit is £800.

Can anybody suggest a cheaper solution?

Thanks in advance.

Cheers

Ian

Here's the situation I'm working with.  There's an existing cRIO based software that needed a quick fix.  In order to do so and report back to the Windows host a Network Shared Variable was added.  This variable is updated during the initialization, but is polled during an idle state in the RT code main process.  The NSV is not wired with error wires (currently) in this idle state.  No buffering or RT FIFO is enabled.  I have an intermittent problem where the NSV in that idle case is claiming that a part of the initialization failed though it hasn't (it's sole purpose is to monitor this).  Here's the question:  Is it possible that the NSV in the downstream loop and case structure is being populated before the initialization completes?  It is my understanding that a structure will act similarly to a subvi in that *nothing* inside it will execute until all the inputs to the structure are available.  However, this is the only sane explanation I can come up with to describe this behavior. 

I have the problem that the projects that I and a colleague developed cannot be built by our automatic build system, there are VIs missing which are part of an lvlib which we created. I managed to reproduce the problem by checking out to the same path as the automatic build does and there the lvlib does not find it's VIs either. Looking into the lvlib file with a text editor I saw paths (or URLs as they are called there) that equal our development environment. For trying I changed them in the text editor to the location where the build shall happen and, voilà, the lvlib would find it's VIs again.

So these URLs are for sure absolute paths which are used to find the VIs. But from what I've read I understood that the lvlib (at least outside of vi.lib and user.lib) stores relative paths, so either I didn't get the point or something goes wrong there or it's a LV bug.

Whatever it is but I really need to get this working so one option is to change the paths for the time being to relative paths. I tried with the format "./<subfolder>/<VI name>" but the dot is then replaced by the library name (which is, of course, not a valid directory). Does anybody know how to enter there a valid relative path?

Thanks and cheers,

flintstone

This is my first post on LAVA, so here it goes:

I am creating an application that involves reading data on two RS-422 serial ports. Everything was going just dandy until it was time to build my application into an executable. I've spent time debugging my issue and have been able to narror down where the source of the error is coming from, but I can't figure out why it's happening or how to fixt it. I created a simple VI that clearly demonstrates the error.

The VI  first configures two serial ports using VISA. It then gets the number of bytes at the port and reads from VISA resource in a loop. Finally the resource refs are closed. Before building into an executable (development mode), everything works fine. When I build this single VI into an executable, there are errors anywhere there is an Instr Propert Node. The error code is -1073807246 (which I can't find anywhere).

Does anyone know why I'm having this issue? Is this some sort of dependency issue? Maybe I'm not really including some VISA functions in my dependenices?

I'm trying to create a VI Analyzer test that verifies certain properties of the containing lvproj of a VI reference.

For quite some time I thought I was doing well, until I noticed the lvproj I was verifying was already in memory. And when it isn't, OwningApp can't provide its reference. Is there a way to open the lvproj programmatically? Or another way to obtain the lvproj reference?

Thanks in advance & greetings,

Bart

I didn't receive any feed for the last week and already got worried...

Check following link:

http://lavag.org/rss/forums/1-lava-forums/

For me it shows up nothing (see picture attached).

The other feeds seem to work quite fine, so I'm wondering whats going on...

I had to leave early so I apologize to all I was not able to say goodbye to.

it was a great experience meeting so many talented Architects, I wish I could meet more people but I didn't have enough time. 

I wanted to especially thank Aristos Queue for his invaluable insights during the summit (answering a lot of questions with an impressive accuracy!)

Hope you all enjoyed your stay in Paris! 

dynamically and its contents not been seen by my user? Thankyou.

                     I am using Labview 2010 . Through DAQ Assistant we can communicate with NI based Boards but how to communicate with    

                     other than NI Cards ,I have a VME based Processor Card and i need to communicate with Lab View.

Thanks and Regards,

S.Naseer

I am coming up with the following code:

Is this the preferred method?

An alternative (probably faster) would be:

Ton

For my application I need to perform 25 operations in series that requires opening and closing of switches and checking the system parameters and all should be in sequence. I do not want a sequence stucture for every task. Please recommend a suitable alternative.

I am using Labview 2012 on windows 7

Regards,

Sofia

We need custom VIs to compare floating point values using a tolerance.

I just discovered something via scripting:

The Floating Point Equal? primitive which does exactly that.

Can anyone imagine why it is missing from the standard palette?

It's in LV since version 8.0 ...

                     I am using Labview 2010 . Through DAQ Assistant we can communicate with NI based Boards but how to communicate with    

                     other than NI Cards.

Thanks and Regards,

S.Naseer

Lets say I have a class "Dialog" and from that I have a child class "Channel Config Dialog" The Dialog class accepts Dialog Pages and puts them in its private data, and the Channel Config Dialog accepts Channel Config Dialog Pages (a subclass of dialog page), but wants to reuse the fact that its parent already caries around pages. So there is a protected set method defined in the dialog class that allows the Channel Config Dialog to put Channel Config pages into the Parent Dialog Class's private data. 

So, I do this by having a static method in the child class, call it "set pages," and this method only accepts Channel Config Dialog Pages on its connector pane. This method then calls the protected method of the parent class to set the pages in the parent data. However, now the pages are being carried around on a parent Dialog Pages wire. If I want to call a Channel Config Dialog Pages method I'm out of luck. So, I was using to more specific class, assuming it's fairly safe because I have specified the connector pane on the child class's "Set Pages" method to not accept any Dialog Page type other than the type it expects. What I can't determine is if this is Ok or if it's pointing to a bad design decision and there is a better way.

If you are confused hopefully the attached code helps

I'm a beginner in Labview and I would like use some Vis in the OPenG ZIP Tool Library.

I would like being able to extract a file in an archive protected with a password and the possibility to overwrite it.

First, I have used the "ZLIB Extract All To Dir" Vi. It works fine except if the extracted file is already present.

There is no OverWrite Option possibilities for this Vi.

2nd, I wanted to try to use the "ZLIB Open Unzip + ZLIB Extract + ZLIB Close Unzip Archive"

However, I think I haven't understood the correct syntax to use the "ZLIB Extract" Vi.

There is no Example about his usage in Help.

On Target Path input, I have linked the Application Directory Constante (The place where I want to find the extracted file)

On The Internal Name input , If there is nothing linked, I have the n°7 error that appears.

If I link a string constante which countain the name of the unique file I want to extract, I have the n° 1059 Error that appears.

PS : In each Case, the file is not extracted. The correct password is also linked to the password input.

Is there anyone could help me about that ?

Kind Regards

Do you guys use Git or GitHub?  What client app do you use?  Any recommendations?

I am specifically leaving the topic scope open, so feel free to praise/rant/headscratch.

• I'm working on a large project, and I'm running LV2012 32 and 64 bit on Windows.
• I have an typedef enum inside a class. The enum happens to be the sole member of the class private data.
• The enum is public and is used here and there all over my application
• I decide to add another value to the enum and ... BAM! ... All instances throughout my project are reset to the first value of the enum.

Kind of defeats the purpose of the enum, don't you think?!

What do other people do? Define all enums fully during the design phase and never change them again? Label each instance of the enum with the desired value to provide some insurance against morphing? Don't use typedefs and update them all manually?

I'm trying to abort call and forget VIs that don't get shutdown properly.

I'm launching using 0x80 (call and forget)

Problem is, I can't seem to find them in memory using VI server.

If I "trick" labview and just start opening a VI by name, and put in the correctly (guessed) clone name

i.e. dameon.vi:3

and it just so happens to be the right name I can find it.

Why isn't it appearing in all VI's in memory?

Is there any way to find clones of a VI through server?

Stranger still:

the name of the VI when i hover over the abort button is something like dameon.vi:Hostdaemon:ProxyCaller.234908238:3

wtf?  how can I abort call and forget VIs problematically?

Lastly, I'm aware of Abort.vi which I forget who programmed.  I got it off lavag at some point, see attached.

~Jon

Oh yeah, even if I get the right clone name from VI server through my educated guess, I still cant abort it problematically with the abort method.

Showing the front panel with an invoke node does work however (wtf? why?)

I can then hit the abort button on the front panel of the daemon, and it does stop.

~Jon

The problem is that this is part of a time sensitive test. using plink has too much overhead. I also have to make a new connection everytime I want to use it.

The tunnel method does not work as suggested by many. I don't believe a ssh tunnel will encrypt and decrypt data for you.

labSSH provides vi's for sftp, scp and ssh terminal which are things I tools I would like to have but I would like to know what experiences people have had with it.

OR better still if there is a solution that is open source.

Matthew L.

The event I'm getting is:

Event ID: 3299

Level: Error

Source: LabVIEW

LabVIEW information:  Error: 404 "Not Found" for "testtcpservice", file "c:/program files (x86)/national instruments/shared/ni webserver/www/testtcpservice": Can't access URL

LV2012, AF package 4.1.1.33

 my AF Boiler Solution.zip   882.13K   36 downloads

I am working on electrical characterization of Semiconductor Devices. I am using the HP 4280A C-V Plotter for that reason.

I have just developed a program that control the instrument just in C Mode. the C-V and C-t Modes doesn't work enough and I found errors in reading the data (the data recorded is only the first one).

open the "HP 4280A C-V Mode.vi" example.

Please help me as soon as possible.

Thank You in Advance.

Best Regards.

The problem I have run into is how the messages are linked to one another.  Since the sender application must construct the message and send it, they need a copy of the message class.  On the receiver application side, the message is executed and within that method, I create the other messages to be sent to internal processes, populate their properties and send them.  Due to this, my original message contains a static link to the class of every message it will send internally.  And if those messages in turn send other messages as part of their execute methods, then those will also be statically linked.

The end result is my sender application has dependencies on nearly every message class in my receiver.  Something I definitely do not want.

This seems like a situation that AF users might run into so I am wondering if there is a way to break this dependency so the sender only needs the message class of the object that will be sent to the other application.  I tried to think of a way to do this with dynamic loading classes, but the need to set the properties of the message to propagate means that I still need to cast the object and am therefore creating a static link again.

Thanks for any ideas.

-John

The attached library provides extensions to the Actor Framework to facilitate the broadcast of messages from one actor to several others. Listeners subscribe to a message when they want to receive it from the Broadcaster, and they unsubscribe when they want to stop receiving it. The library provides a set of common interfaces that decouple Broadcasters from Listeners so any two actors in a messaging hierarchy can communicate via broadcast without having the same caller.

This library extends the Actor Framework; it does not modify the core framework in any way, so it may be used in existing projects as well as new ones.

Documentation for the library and the included example program is attached.

So, for example, I may have a channel and when it is out of a specified range it sets a digital out or closes a relay, or sets another analog voltage etc. My idea was to have a "condition check" class that was injected into a channel data class. That way I could define subclasses of check condition such as range check, frequency check, digital line change check with a must override "condition met" VI. This would allow me, between systems, to easily define new classes for checking data changes and plug them in. I then wanted to also inject a class defining what to do when condition is met. For example, close relay, set digital out, notify user etc.

This all seems like it will be extremely flexible which is great, but it breaks down for me due to the fact that it's on a per channel basis. I could process 50 channels and x  number of them could all have a digital out to set based on a met condition. If all those digital outs are in the same DAQmx task, I don't want to make 3 individual calls to the DAQmx write function. I want to compile them all into one message "set these digital outs on this task" with an array of the lines to set so I can call the DAQmx Write function a single time.

So what I'm wondering is 1) is my best bet when processing channels to keep track of all the conditions I will set on a per channel basis, then have a method to compile all the ones I can into a single message (i.e. set all these digital lines on this task) or 2) Is there a better way that would greatly simplify this?

Thanks, and Happy Easter!

http://www.automatic.com/

i trying to conduct various tests on my cc1101 and adf7021-N transceiver.i think i require RFSG and RFSA and labview modulation tool kit for doing the tests moreover the hardware which i have cannot be interfaced with labview so can anybody is there  tool kit which will enough for me to do the complete testing of my rf transceivers as i feel buying all those three equipments is costly

candidate should be good at chinese  and english 

email:cherry.wang@gcjobnet.com

skype:cherry.wang84

I have two projects that share several libraries and classes.  One is a client application and one is a server.  In order to test my code, I need to open both projects at the same time and run the main VIs.  When I open the projects, the common libraries and classes are locked and I cannot edit them.  So far, this appears to be normal.  Where it gets strange is when I close one of the projects.  If I have run the VIs to test something and then stopped them, closing the owning project of one of the main VIs DOES NOT cause the VI to also close.  The correct project name is still indicated in the VIs window (lower left) and the project is clearly closed but the VI is still hanging around.  The second thing that is weird is the common libraries and classes remain locked. Even closing the other project and returning the to the start-up screen does not correct this.  The only way to edit those files again is to close LV completely and then reopen it.

This is getting a bit tiring and I am just starting to develop this project.  I am working with LV2012f3 but have not yet tested this in the 2013 beta.  (I really do not want to port the whole project over at this time).

Any thoughts?  Anyone else seen this?  I checked the known issues link and did not see anything related.

http://www.ni.com/white-paper/13993/en

thanks,

-John

I am facing problem of screen resolution, when i am switching from low resolution(1280*1024) to high resolution(1920*1200) my front panel object got stretched and deformed.

i have tried VI properties but it still same.please help.

Thanks,

Pravin

I need to be able to make a transparent color box.  One would think that selecting the "Allow Transparent" property, and picking the transparent box on the color selector tool would make the box transparent, but no.  It makes the box white with a capital T in it. 

My understanding of the definition of "transparent" is that if something is transparent, you can clearly see anything behind it.  Not that you can see a white box with a "T" over top of it.

Am I missing something?

There are lots of links to cludgey work-arounds, in versions of LV before "Allow transparent" was an option (I guess).  But this should be a trivial thing, considering the property is there.  And any other control that is allowed to be transparent is actually transparent. 

(In the actual app, I've got a cluster of arrays with a total of 1000+ color ramps representing sensor channel values.  I need an overlay of color boxes to mask out unused channels with one color, bad channels with another color, and transparent boxes for good channels.  Except transparent color boxes aren't actually transparent...  I could cludge this by using booleans or something instead, but it seems like this is what a color box should be for.)

Further, the parent can (awesomely) declare "Must Override" per Dynamic Dispatch method, a contractual requirement of the subclass to implement the method. We're cool so far -- this is just a definition of how things work.

Here's where things get tricky: it's *so nice* to have that "Must Override" flag, yet you wish that implementations had a different ConPane than the parent method. Clearly, Dynamic Dispatch would be the incorrect choice, yet it hurts to give up "Must Override".

So what do you think: could there exist a concept of "Must Implement"? It's like "Must Override", yet does not require the subclasses implementation to adhere to a ConPane interface.

These Implemented methods act like a static method of the the class, only callable by the class and its descendants (this is not like Dynamic Dispatch, since a broken wire would result from wiring a Parent object to an Implemented method). The parent simply requires implementation -- the existence of a method -- without defining the interface.

Do other languages have this concept? Are there design patterns that address this need? Or is this desire for "Must Implement" indicative of poor OO design choices?

Name: Wire And Connect Quick Drop Plugin
Submitter: bbean
Submitted: 03 Apr 2013
Category: *Uncertified*
LabVIEW Version: 2012
License Type: BSD (Most common)

This Quick Drop (QD) plugin complements the functionality of the built-in QD plugin (CTL-Space-CTL-D) by wiring between selected controls, indicators, constants, and SubVIs.   

Click here to download this file

(My wife had to explain to me that "nephrotic" refers to a "nephron," which is the basic functional unit of the kidney.)

 QSM Evolution.zip   250.83K   36 downloads
Code used in presentation video detailing why the typical QMH is fraught with issues that we have all run into

Credit to Daklu for it's creation and sharing

I have remote application (i.e. telnet server) using command prompt I use telnet client for example telnet 127.0.0.1 9001 and sending command to the application. And it works fine but I want to use labview based telnet client using TCP to send command to the remote application.                                                                                                             

By using command prompt (telnet client) i can send command directly to the application, but I have tried with TCP and it can't give me proper output please find below code snapshot and please reply.

Thanks

Pravin

We’re proud to note that the JKI team hatched this idea at the Americas CLA Summit 2013. The energy and creativity of the Summit really got our juices flowing, and we’ll have more blog posts about our CLA Summit experience coming soon!

How’d we do it? LabVIEW Scripting, of course. Want to know more? Post in the comments!

I want a neumeric Indicator which can easily represent how much a range is filled. For example I have a range which is -2 to 2 and I get from somewhere that the range is full from -0.5 to 1 the indicator should correctly represent those.

The XControl behaves like an array, so when an element is added or removed, I want the bounds of the XControl to resize dynamically. This will allow me to do some dynamic arrangement of controls based on the XControl's new height and width. I get error 1148 ("read only property value") when trying to set the Front Panel Bounds inside the XControl, using the Facade VI reference.

I've gotten around this problem by calculating the "visible height" of the XControl and returning that value as a property. But this feels like a very hackish way of solving the problem.

Any ideas?

Do you know of a simple way to check programmatically if a VI (any LV file actually) is compatible with different LV targets (Desktop, Real-Time, FPGA)? Currently I plan on scripting an empty project, add Real-Time and FPGA targets, add the VI under each target and check for execution state. Since I expect this approach to be slow as ****, and a broken (e.g. under construction) VI will defeat the check in any case, I'm looking for a better alternative.

Is there some private VI Server methods that can tell me if my subject LV file is compatible with this or that target? Preferrably while loading as little as possible of the file into memory. Of course a VI and its dependencies need to be loaded to check for compatibility, but I want the process to stop as soon as a problem is encountered (since by then I know the answer is "not compatible"), and I definetely don't want the "searching..." prompt to appear if a dependency is not found at the expected path.

Looking forward to your input here!

Cheers,

Steen

This is Engineering

 
 
This one even has LabVIEW in it!!!

ENGR Nights

So here is today's problem. I have 6 instruments and each instrument takes 6 controls. So I have 36 controls. Now I want to sync with that instrument so I made up a subVI which reads all the 6 settings from the hardware and gives me those in the output. But now to sync with all the 6 instruments in my main VI I have to have 6 instances of my subVI and then wire 6 value property nodes to them. This looks pretty big and maybe will slow down the VI. So what can I do to avoid this?

One scheme I thought up was to put the subVI in a for loop and use array index node to give me each value. But of course, that looks worse than the original way.

Is there a way in LV to avoid this? Or should I just give my 6 subVIs and be done with it?

A: Not much.

I've made an interesting observation.

Roughly a month ago, two ideas were proposed within a day of each other.  My suggestion was that Error Wires should be placed under other wires, and Darin suggested that the Read/Write status of property nodes should be determined by how you wire them. Both ideas were fairly straight-forward, both are coding-related, both had a simple image and clear explanation, and as of now, both have attracted about the same number of comments (12 vs 16) and kudos (65 vs 70).  I haven't fully compared the kudos, but it appears there's even about the same number of NI voters and "high-rank" voters for each.

However, and I don't think it would be just my opinion, Darin's idea is infinitely more useful and valuable than mine.  It's an idea that would allow faster and easier programming, and be a noticeable improvement.  Whereas error wire layering - it would be "nice" if it was implemented, but it's just cosmetic, not a game-changer.  Yet they've attracted about the same number of kudos.

So I can now understand when AQ and other NI reps say that popularity of an idea is a pretty poor indication of its value.

PS - go vote for Darin's idea if you haven't already.

I'm just beginning to feel out what would be required to write a driver for a 3rd party PCI card in LVRT. The outline is thus:

I have a laser interferometer card from Agilent, there are no drivers that I'm aware of for pulling information from the card directly into the RT system. My lab has been using a custom built hardware interface which taps off the hardware-out lines on the card when it is installed in a windows box, and reads the lines into an FPGA card in the RT box.

This means we have to maintain two systems, a windows box to host the card, and an RT box where we're doing all our control. I'd like to simplify the system by doing whatever is necessary (driver?) to install the card direct into the LVRT box.

My initial google has turned up resources for Veristand (I'm not familiar with it at all, and assume it isn't what I want), and not much else.

The install disc I have provides an API (headers with function declarations and register maps) but doesn't expose the functions themselves (they're in a compiled dll I think) There is also a pretty comprehensive manual about the register layout. My RT operating system is Pharlap, which can apparently call functions from a .dll (linky). The driver is a .sys file, could it be as simple as ftp'ing this into the right place along with the .dll and using "Call Library Function"? I couldn't find any information about what type of driver file Pharlap (and LVRT) expect, but I suspect it's not .sys (too good to be true).

Anyway, I'm wondering if someone could point me in the right direction? Possibly with a link to any tuts/white papers about LVRT driver development?

Many thanks for your time!

Kind regards,

Alex

I have started worked on a new project which require using Keyence Laser Marker MD-F3000 series to  mark serial number. I cannot find any documents about control this device programmatically such as input a certain string with different parameters and tell the controller mark it.

If anyone has experience with this device please give me advice how this one work or where I can find document about it.

Thank you so much!

We're about to try to do an ambitious experiment that if it works will drastically change the look and feel of our software.  I wanted to see if someone has already done this or if it's been tried before by smarter minds than ours and shown to be un-doable.

Our software allows people to create display windows (like graphs and tables) at will that in turn open up in separate windows.  We would love to be able to constrain these windows within our program window, bind them to tabs on the main window, do soft-snapping with other windows, allow them to be docked, bind them inside window panes so that if there are too many of them you can scroll up/down to see them rather than have a mess of windows all over your screen, and all kinds of other spiffy things that you can do in other programming languages.  However, LabVIEW doesn't seem to be up to the task from what I can tell of it's vi property/invoke nodes.

I recently was successful at making something closer to  what we want, however.  I made a fake window toolbar from a picture control, put a subpanel underneath it, and put another control at the bottom right of the subpanel control for resizing.   I then captured mouse clicks and mouse drag events to detect the picture control being clicked on and drug to move the "window" around and similarly for the window resize control.  Attached is an image of the fake window

Doing this I was able to have this "fake" display window contained within a tab on our main application window that was able to be moved around and could even be moved off the screen but accessed via the scroll bars.

Now the question is whether we can scale this up.  We're going to try to create an Xcontrol which has the titlebar, subpanel, resize control and handles mouse events.  I'm not sure this is possible, however.  Whether we can get all the mouse event handling worked out and passed to the proper Xcontrol, and whether this scheme will put too much load on the processor.

So...  Anyone done this before?

today I received a newsletter for the NI USRP platform so I looked a bit into it and now I wonder what kind of hardware this is. When comparing with the USRPs sold by  Ettus Research which is the "standard" USRP supplier it seems that the NI 2920 USRP is either the USRP N200 or N210, the only visible difference from outside is the NI logo vs the Ettus logo. I'm really curious about this, does somebody know which hardware the NI USRP is?

Best regards,

flintstone

http://lavag.org/topic/16567-script-new-lv-class-with-private-data/

This is what it looks like:

I am finding that I cannot have both the main vi and the subpanel process both registered for the same set of events without

LV crashing.  If anyone would care to take a look I would appreciate it very much.  

Just unzip and run the Aircraft Emulator vi with one event enabled, observe the event generation and reception counters are keeping up with each other.

Now enable the 2nd event and watch LV crash.  BTW, I have tried running the process outside the subpanel and it still crashes.

TIA

I wanted to get people's opinions on the following idea. I am currently writing many lvlibs that we intend to reuse in many different applications we are developing. The interface of the lvlib needs to properly designed in order to avoid any problems down the road: if an interface needs to be redesigned, then many of the applications could have their structure modified. The rework could be extremely painful. If you do as much as remove one input terminal, you need to go through and fix all the places where that terminal was connected to.

Now suppose the interface to every single vi becomes the following: typedef cluster in, error in, typedef cluster out, error out. If you remove one terminal in your input cluster, you may have places where you need to remove "Bundle by Names", but you may save yourself some time in places where that terminal did not matter. Has anyone experimented with this? Has this worked/not worked for anyone out there? 

Thanks,

Carlo 

I first filed some bug reports at SourceForge, before realizing that the bug tracker there has been quiet for a year. Is this the preferred place to file reports?

Anyway, the two bugs are:

• String to 1D Array output is empty, if delimiter not found
• String to 1D Array doesn't recognize End of Line Constant

I've got some plugins for the quick drop built with LV2009. I used them many times. Now I'd like to used them on my labview 2010 and labview 2012 but I can't find the right location where to copy them! Where I have to copy them to be able to use them while I'm developing?

Thank you guys in advance!

I have a image control as input. I would like to know how to check if the image data is valid or not.

I tried to search this on Google but I cannot find answer so if there is already answer, I am sorry but help me point to it.

Thanks!

Thang Nguyen

My basic goal was to build something that could replace the old school messaging in my pre-LVOOP applications.  So, I wanted something that allowed for flat messaging (all processes are peers and can direct message each other) and had some type checking on the messages (I replaced the old typedef'd enum and variant with a message class).

I also wanted it to be easy to extend with additional features, such as a message log or the ability to send messages between application instances.

Along the way, I added a way of building hierarchical message systems like Actor Framework.

I also added subscriptions like JAMA.

And I tried out dynamic processes and well as static ones.

I am attaching a series of example projects, each one contains the core message architecture components so if you unzip them all, it will overwrite those parts each time.

The basic concept of the architecture is comprised of four components:

The system class defines the overall functionality of the message system

The message class that all messages inherit from

The transport class that defines the generic interface for sending and receiving messages

The process class that creates the message handler.  (This is roughly equivalent to an Actor in AF.)

The examples demonstrate remote messaging, dynamic processes, hierarchies of processes and message subscriptions.

Most basic example:   Message System Basic Example.zip   623.76K   44 downloads

Examples for demonstrating client-server network messaging:

 Message System Client Example.zip   1.21MB   22 downloads

 Message System Server Example.zip   899.33K   23 downloads

Example of dynamically loaded processes:   Message System Dynamic Process Example.zip   984.07K   27 downloads

Example of a hierarchy of message systems (like AF):   Message System Isolation Example.zip   713.13K   25 downloads

Example of message subscriptions (like JAMA):   Message System Subscription Example.zip   715.48K   27 downloads

Please comment (good or bad) on the system overall and how it is organized.  I am sure there is lots of room for improvement.

Thanks for the feedback!

-John

ps. If you have any ideas for what to name it, let me know,  YAMS? (yet another message system) TUMS? (the ultimate message system  ) Any other ideas?

Suppose I find a big horrible bug in LabVIEW, the kind of bug that only happens at runtime and that only happens when my LV build EXE runs on Windows 7 64bit, never happens when my EXE is ran on Windows 7 32bit. So I would contact NI Support, give them the source code (~2k VIs) and the details to reproduce, try to narrow down the issue by eliminating parts of the code, etc... and then after a couple of months no solution has been found so I'm left with my wounds to lick, being told I should try and convince those who use my product that they should only use a 32 bit OS.

And let's also suppose that my company is a gold member of the NI alliance program, and that I've already sold 50+ licences of my product, each of which also includes about $10k of NI products.

If anyone was ever in a similar situation, what could they do to sway NI to put real effort into solving the issue?

But again this is just a rhetorical question!

My Definitions

·         Running = Some element of the vi is currently executing

·         Reserved = This vi is a sub VI of a running VI, but this vi is not actually running

·         Idle = In memory and not running or reserved

Execution State property definitions

·         Running = Some element of the vi is currently executing   OR   this vi is a sub VI of a running V

·         Idle = In memory and not running

Since each vi's front panel displays a running arrow when the vi is running and a reserved arrow when the vi is reserved there must be some way to programatically distinguish between these two states.  I hope that this distinction is exposed to programmers.