WMassey

I too had first tried Google, both with and without the URL-specification and came up empty.

Searching for this rather specific text:

when I made the "Trim Whitespace.vi" be reentrant 

does seem to work though.  

I maintain that the forum search function is just not very good.  It may be a clone or relative of the one used by NI because theirs is not so great either. Or since even Google has problems, perhaps some randomly selected older threads are kept hidden from the search engines just to annoy us as we are forced to try other ways to search.  After all, looking for a result that is being withheld does expose us to more of the advertising that litters the bogus results. 

Given that I knew this topic existed, but was having a hard time finding it...

 

And that I tried searching for it in this manner:

 

I don't think that this should be the result.

The "Number to Proper Engl Text" and "Place Number to Proper Engl Text" VIs found on the OpenG string palate are a couple of neat VIs that were just what I needed when I went looking for a test data source that would turn a loop index into a constantly-changing text string.  Since this was the first time I had ever used them, I initially investigated them just a bit and was mildly surprised to see what they returned when fed a negative value. 

If this pair ever gets tweaked in the future, perhaps it would be worthwhile to also update their built-in VI documentation to say that they are only meant to work with non-negative numbers.

1) On the NI web page devoted to the OpenG library, on the overview tab, the contact information is wrong.  It refers to "Website: http://forums.openg.org/" which is incorrect.

 

2) The VI documentation for the "Merge_Directories" VI states:

 

"Copies the contents of source directory into the destination directory.  If source directory has subdirectories they will be copied into the destination directory recursively.  Optionally, existing files may be overwritten, by setting the "Overwrite Existing Files?" input to TRUE.  If you attempt to overwrite an existing file without setting to TRUE an error will be returned.   If FALSE, existing files will not be overwritten and no error wil be returned, Optionally, read-only files may be overwritten, by setting the "Ignore Read-Only?" input to TRUE.  If you attempt to overwrite a read-only files without setting to TRUE an error will be returned. Optionally,  by setting the "Delete Source?" input to TRUE the source directory will be deleted upon merge completion if no errors occured."

 

The two highlighted statements conflict with each other. After observing the operation of the VI, it appears that the second of the two statements needs to be deleted.

CAR# 378165

LabVIEW Version 11.0.1f2

In a VI for a FPGA target, if an error cluster is wired to one input of an OR gate that has a Boolean wired to the other input, then in the "generate intermediate files" process that precedes the Xilinx bitfile generation, "stage 1 of 7" (analyzing VI hierarchy) will very repeatably crash while processing the VI. See attached PDF.

It turned out that the problem was a slightly misformed URL.

GET does indeed return the requested file in the "body" string if no path is attached to GET and it drops it into the file if a valid path is provided.

Thank you again Shaun!

I had tried feeding the URL (URI?) for the target CSV file to GET.VI and all I got in response was a "you are being redirected" in the "body" return string (or else the designated file if I passed a file name to GET). If GET truely is the correct way to do this then I guess I need to revisit my methods of producing the request...

Thanks.

In this topic I was helped to understand how to use the HTTP Client VIs to connect to a HTTPS server.

I have manged to use those Client VIs to gather sufficient (dynamic) information from the server to form the dynamic download links for a series of CSV data files that the server can provide. The HTTP Client VIs seem to me to be able to only return web page header and body information. I have not found a way to use them to grab a file specified by a URL. Is there a way to do this with them? The HTTP Client VIs make use of "Client Handle" RefNums to identify the open connection. Are there other VIs available in the VI library that can also use these same Client Handles and which can transfer a file?

Thanks!

You might consider checking out libcurl. They have a C binding, so you should just be able to drop CLNs and go nuts with it. I have had excellent luck in the past using libcurl (via php) to automate HTTP/HTTPS transactions.

Thanks for the suggestion and link. If I cannot get LabVIEW bent to my will then I'll consider it.

You are connecting to an SSL address (https) but not configuring the internet session to use SSL.

Put a "ConfigSSL.vi" after the open.

Thank you! That did seem to help! I had tried using it (ConfigSSL.vi) at one time with this test code but had no luck and got scared away from it by all the inputs to the VI that I did not know how to use. After your suggestion I tried it again. My first try again yielded the error #42 but then I saw that the VI had a default-True boolean input telling it to check/use all those other inputs. I set the "verify server" input to false and the error went away and, based on the redirection and cookie I'm seeing, it appears like the login worked!

Thank you!

I recently looked this up and saw at the time that it was built-in functionality. This link says "All CompactRIO, FieldPoint and Compact FieldPoint controllers have built-in network monitors. If you enable the network watchdog and the controller loses communication with all hosts or clients over the network, controller sets the output channels to predefined values corresponding to the watchdog state."

There are also these if you you want to do it yourself:

Uni-Directional Network Watchdog Reference Example

Fail-Safe Control Reference Design for CompactRIO

I am trying to use the HTTP Client VIs to implement a version of the C# code found HERE. Unfortunately there are no NI examples of how the client VIs are to be used and my various attempts to string them together only seem to result in "Error 42" (LabVIEW: Generic Error) from the POST vi, rather than returning the headers and body text.

I have also tried using DOTNET calls and was at least able to get the login page returned but could not seem to trigger the login.

I switched to the HTTP Client VIs because they offered an alternate hope and I could at least see where to attach a cookie file with them (though a cookie file may not be the same as reserving space for a session cookie).

Any guidance would be appreciated!

QUOTE(CTITech @ Feb 21 2008, 11:15 AM)

Ok. I have a string of concatenate and i need to get it to go into a write to spread sheet vi. Since Im new to this whole thing I could just be over looking something extremly easy

I suspect you do need to put a bit more effort into learning this on your own before saying you need help.

The library ships with examples and Example #1 shows a situation where the "Write Strings" vi is used to write strings to a spreadsheet. The strings to be written by way of this vi do have to be in an array to make the connection to the vi, but you do know that arrays can have only one element don't you? You just might be forced to pass your string through the build-array function before connecting up to the vi.

QUOTE(CTITech @ Feb 20 2008, 10:22 AM)

I cant seem to find the library to download

It's right there in post #4 of the other discussion thread to which I referred you.

It was "http://sine.ni.com/apps/we/niepd_web_display.display_epd4?p_guid=B45EACE3EF0056A4E034080020E74861&p_node=print' target="_blank">Excel Toolkit (GOOP)" just like here and the link works.

QUOTE(CTITech @ Feb 20 2008, 04:38 AM)

I dont have the tool kit at my work, is there a way I can do it without the tool kit?

Well you can download and use the library (it's free) . But if your rules at work don't allow for that sort of thing, you can build the functionality from the ground up. That's what Martin Vernhout of Philips Research did when he put the library together in the first place. But you'll need a good understanding of the internals of Excel and how to access them through Method & Property nodes with ActiveX.

This is an example of his subVI to write an array of text values to a specified set of locations on a selected worksheet:

http://lavag.org/old_files/monthly_02_2008/post-2800-1203521435.png' target="_blank">

In it you can see the Worksheet method and the Range property node used to transfer the string arrays to the Excel process.

I've attached the help files associated with the library for your consideration.

So far, the only thing about the library I've found so far that I don't care for is that the lowest-level "excel objectRepository" vi has a locked block diagram, but that doesn't keep it from being perfectly usable and a great help to have. Besides using the library to read and write native .XLS files, I've used it as a learning tool and have expanded on it to the point where I can even create graphs on the Excel worksheets with it.

I, for one, am grateful Martin chose to share this with the rest of us.

Try it, you'll like it!

All you want to do works easily enough if you have the Excel toolkit mentioned in this discussion:

check here

I had also asked Neville directly if he still had this tool and he replied that it was "lost in the mists of time."

After some digging I found that the property is available through this path (LV v7.1.1 with scripting enabled):

I'll try, when time allows, to get it built into a tool.

QUOTE(tcplomp @ Oct 28 2007, 10:29 AM)

See http://forums.lavag.org/Shared-Variables-LV-820-problem-t4388.html#' target="_blank">here, where I posted some code that uses VI analyzer to check for this.

Ton

Thanks but VI analyzer is not an option at the moment.

Did anyone ever build a "find coercion dots" tool?

I found an old email that hinted that Neville Dholoo & David Edwards were working on one but I never did find anything beyond that.

Can you access the port using the latest version of MAX (measurement & automation explorer) on the systems with the problem? It's got to work with MAX first.

Version 1.71??? The latest VISA driver is v3.5. Get it here (for Windows, otherwise see the link I posted above).

When you get done installing VISA, you should also have something called "Measurement & Automation Explorer" (a.k.a. MAX)installed too. You can use that to do primitive serial communications tests. If you can communicate using MAX then you can communicate using LabVIEW if you program it correctly.

Usually when you see an error number with no explanation like this it is an indication that the software for that device (which would include the error explanations) is not installed. Try getting a VISA driver from here, install it and run your code again.

Parts of this discussion remind me of this show that TechNow! recently broadcast about a study of world events affecting random number generators.

Hi Warren, this question is out of curiosity.

Untill now I have only been involved in sending and recieving bytes through pin 2 and 3 of the serial link. Does LV support the idea of controlling each individual pins on the serial port. I.e. I only use pin 2 & 3 to send and recieve, but what if I want to use pin 4 of the serial port to just send a single bit ( a binary 1 ). Im not sure how I could get a more of a HARDWARE controll over the serial port pins. any idea?

Pin #4, let's see, according to the 9-pin RS-232 spec, pin #4 is the DTR (Data Terminal Ready) pin (see the Serial Quick Reference guide found here).

This is something I didn't know you could do until I just now went here and did a search on these three words: control DTR pin which turned up this posting (along with several others).

The search pages, both here and at NI should be everyone's first stop when trying to find out something you don't know.

Anyway, this appears to be how it would be done.

I have a new Latitude 610 and I load very little software other than NI and the Microsoft viruses. LV 801 still crashing at least once per day

Well I think that's your problem. You've got to stop installing those Microsoft viruses. Heck, if I were you I'd make a point of uninstalling any that you have installed. Everyone knows that Microsoft has a particularly poor record when it comes to producing viruses (though I hear that they have been known to produce code that supports others efforts in this area). :laugh:

Seriously though, I too have seen the broken run arrow and nothing in the error list and this is with v7.1.1 so it's not necessarily something new with v8. I find that I can usually "fix" it by closing and then reopening all the VIs. That'll usually make the errors appear but, if I remember correctly, in at least a couple of cases it made the errors and the broken arrow disappear. I have no idea what causes it.

I'm still working on the eye-tracker.

Vision system watches my eyes and moves mouse to where I am looking.

Left blink = left mouse, etc.

(Don't hold your breath)

Ben

Actually you might have to (hold your breath that is).

One wrong move and you might end up deleting a whole day's work.