Eugen Graf

Hello, I would parse a boolean cluster but get some problems(Look attachment). Should I realy make a workaround with Cluster->Array or are there another ways to solve it?

I want also interpret a boolean element as a boolean(=1 Bit) not as a Byte.

Thank you, Eugen

I would ask them to announce all plans for the future (like in LV7.0 we implement event driven programming, in LV 8.2 GOOP and so on).

Eugen

QUOTE(frentzen @ May 29 2007, 12:28 PM)

Hi,

i need to read data from a .xls file (i can not attach the file) and i want to show the data as a graph.

If somebody can help, would be great.

Thanx for your support.

1) Look Excel ActiveX examples from LV Example Finder. It should be not difficult.

2) Try to open this XLS-file with a Text-Editor. May be its only a spreadsheet file and you can read it as a text file.

Eugen

QUOTE(crelf @ May 27 2007, 10:49 PM)

FYI: Tagscanner has moved to a new home - the page is in Russian, but if you mouse-over the links at the top, you'll see one for downloading (the software is still in English).

Here the english version of this site:

http://www.xdlab.ru/en/index.htm

Eugen

Actually I use mixed form to communicate between tasks. I have some Queue, Notifier and User Event Tasks. All of them have advantages and disadvantages. Here the snipped of my Open Refnums VI.

http://forums.lavag.org/index.php?act=attach&type=post&id=5918

For communication I use Flatten/Unflatten binary String VI, it's seems to be better than Variant, because I can parse the remainig string after parsing the command.

http://forums.lavag.org/index.php?act=attach&type=post&id=5919

Generally is my construction like queued state machine in each task. Every state in every task can be set by own task AND by other tasks if it's allowed by program. Here snippets of my reading task.

http://forums.lavag.org/index.php?act=attach&type=post&id=5920

http://forums.lavag.org/index.php?act=attach&type=post&id=5921

And this one shows the state if I get new settings in my reading task if I get any from the main task. As you can see, I switch my reding task to the state "read data" after I got new settings.

http://forums.lavag.org/index.php?act=attach&type=post&id=5922

Any comments?

Thank to all replyers.

Eugen

QUOTE(John Rouse @ May 20 2007, 02:33 AM)

The thing about reading from an RS232 device is I do not know a way to have the device tell me (my LV APP ) that new data is available as an event.

Thus all I know how to do is poll the receive buffer for characters and extract them when they are available. But it is still polling and thus every so many milliseconds I have to use that resource to check.

Yes, it's possible:

http://forums.lavag.org/VISA-events-t7626.html''>http://forums.lavag.org/VISA-events-t7626.html' target="_blank">http://forums.lavag.org/VISA-events-t7626.html

Eugen

QUOTE(tcplomp @ May 19 2007, 10:53 AM)

Hi Eugen,

you can do event driven data acquisition. Register for the DAQmx event 'number of samples' acquired!

Ton

Sorry, I don't understand you. How is my application related to DAQmx(I have never used it)?

I want to make a template for my projects.

My read-task should be universal, undependent from interface. And as I know DAQmx is created for analogue data aquisition and it doesn't support interfaces like serial, CAN or TCP/IP with NI-unknown protocolls.

Eugen

It's okey if my read-task triggers itself?

Eugen

QUOTE(Michael_Aivaliotis @ Apr 18 2007, 06:40 PM)

Are your devices, serial? I think only serial devices really need to be closed to release the port for others to use. GPIB devices don't have to be opened or closed. At least not anymore. Other than Visa Open or Visa Close, I'm not sure what kind of instrument command you want to send.

Regardless. If this is still the case, you can do this with queues as well. Keep in mind that you will need different queues for different types of tasks. The example shown assumes that you are working with the instrument task queue. Also, I haven't used any subvi's to keep the example simple but I would suggest encapsulating the enqueue functionality into subvi's.

http://forums.lavag.org/index.php?act=attach&type=post&id=5545 http://forums.lavag.org/index.php?act=attach&type=post&id=5548

http://forums.lavag.org/index.php?act=attach&type=post&id=5546 (LabVIEW 8.0)

There are many solutions to your problem. User events can be used as well. However, I would even argue that you don't need parallel tasks anyway. Why can't you just do everything in the main state machine? I'm not sure of the benefit in your case. Perhaps data saving would be better off in parallel if you have lot's of data. What is the speed of the overall system?

Like I mentioned, there are others who will suggest solutions different to mine. I have also used user events and various GOOP frameworks, however this is all I have for now.

Dear Michael (or anybody else),

could you say me how I can implement your mechanism for read-tasks? Sorry, I can't guess it right. Your solution is really good, but fits IMHO only for write-tasks. The difference is: a write-task waits on commands from main, but a read-task shoud wait for data from interface AND for commands from main. How can I implement it.

Thank you. Eugen

QUOTE(Jim Kring @ May 17 2007, 12:31 AM)

If that is an illegal download, then you should be reporting it to NI, not posting it on LAVA.

It's a legal download. You can ask german labviewer.

Eugen

But here you should find a full version of LV 6.1 for Linux & Mac.

http://www.heise.de/software/default.shtml...neu&srt=dat

Eugen

Yes, thank to all, I understood all, what was needed.

Eugen

Here an example what I opine.

Eugen

Thank to all, I thought on

#define

in C/C++.

Is it possible to make something like this in LV?

Eugen

Hello, how can I create a global constant. Should I take a global variable? Or can I do it with typedefs?

Eugen

Programming my first OOP-Project I get a comic Impression: allmost all classes I create are only wrappers for in LV existing objects like file-refnums, VISA interface refnums and so on. I only adapt this objects for my application.

Eugen

Here is my workaround, thank to all.

Eugen

QUOTE(robijn @ May 9 2007, 11:20 PM)

You could try my Time scan/format functions (http://robijn.net/labview/''>http://robijn.net/labview/' target="_blank">http://robijn.net/labview/). They still use the DBL time format, but work fine. I have not updated much lately, I do have a "modern timestamp" version laying around but I yet have to finish the Excel conversion function yet.

You could use a modulus 100 twice as well.

Joris

Wow, some time ago I so needed the julian <-> gregorian convertion and didn't know that it exists(I implemented is by myself).

To my problem: I will try your VI tomorrow.

And thank you.

Eugen

P.S. It's really a big problem for me now. Can anybody help?

QUOTE(JFM @ May 9 2007, 06:57 PM)

I'm sorry I didn't realize you were on LV8.01, in LV8.2 this issue seems to be resolved (except in that %3u does not work with comma).

How do you want the string "155529.00" to be interpreted, as 15:55:29.00?

/J

Yes, it's a UTC time stamp from GPS receiver.

155529.00 should be 15:55:29.00

P.S. NMEA sequence GPGGA

P.P.S. I know, I can split the string by hand, than bundle it to cluster and convert it to a timestamp, but should I really do it?

QUOTE(JFM @ May 9 2007, 06:26 PM)

I don't think the original code and the workaround produces the same result.

According to the probe in the picture, the input string is "155529.00".

The workaround converts the string to a DBL value, i.e. 155529.00, and then to a Timestamp equal to "1904-01-02, 20:07:39.000", i.e. the value contained in the string is interpreted as seconds since "12:00 a.m., Friday, January 1, 1904, Universal Time"

The original code, where you used the format string "%.;%<%H:%M:%S%3u>T", indicating that you expect the string to be parsed as 15:55:29.000 which is completely different from the result of the workaround.

The solution therefore depends on what kind of time value you have in the input string:

• If you want it to be interpreted as 15:55:29.000, use the format string "%.;%<%H%M%S%3u>T", i.e. remove the colons (there might still be an issue with the localization).
  
• If you want it to be interpreted as seconds, use your workaround or use "%.;%t" as format string and convert to TimeStamp afterwards.
  

Hope this make sense.

/J

Thank you, you have right and the problem is not solved yet. And your solution don't realy help. See the attached screenshot. Any more?

Eugen

QUOTE(crelf @ May 9 2007, 05:41 PM)

I don't have time to answer all your questions right now, but here's a few comments:

• Yes, Endevo's GOOP costs extra $, but if you need the extra functionality it's worth it
  
• There are several other GOOP implementations out there that are free or very cheap, including (but not limited to) dqGOOP and OpenGOOP
  
• As for understanding LVOOP Vs GOOP, I don't agree: I think it's what you're first introduced to. For example: do you use the config file VIs on the palette? If so, then you're using GOOP. LV-OOP certainly is an excellent step in the world of LabVIEW, but for those of us who learned by-reference first, it's tricky to change our habits, as it's a different underlying paradigm.
  

Sorry for my briefness...

Thank you,

arriving a class by reference or by value makes me no difficulties.

Eugen

QUOTE(robijn @ May 9 2007, 05:48 PM)

I don't think so, because the dot is already formatted/scanned by the %u thingy.

I think the internal time format/scan functions don't understand/use the %.; that was placed in the format string. So it's a bug if you ask me.

Joris

I think just as you.

Eugen

QUOTE(Aristos Queue @ May 9 2007, 03:56 PM)

Read the FAQ about this:

http://zone.ni.com/devzone/cda/tut/p/id/3573#toc2' target="_blank">LVOOP & GOOP

I would prefer LVOOP for GOOP, because I automatically get updates and upgrades, because it's implemented in LV and supported by NI. Endevo's GOOP should cost extra money and NI's LV I just have. LVOOP has indeed any disadvantages to GOOP, but I hope in future versions of LV new OOP features will be implemented. And I think it's easier to understand LVOOP as GOOP.

Why I should use GOOP instead of LVOOP for this issue(project described in this topic)?

Eugen

Yes, it works. But I don't know if I think right in LVOOP. Can anybody critic my first project.

Thanks, Eugen

Hello, I have a problem scanning a timestamp from string on a german PC. Look attached snippet. If "use localized decimal point" is set in the environment than I get this error, if not it runs without errors. It's a bug?

Eugen

Now I replaced Scan From String with String To Float and then convert To Timestamp. No more errors. But where was the problem?

Eugen