calling perl script from labview

[SL_Ong]

Hi,

I have a perl script and I would like to call the perl script from Labview

anyone can help me with that?

I used system exec but I'm getting an error.

Anyone have a working example like calling a simple perl script from Labview.

Thanks

SL Ong

[falkpl]

Did you protorype the ssytem exec on the command line prompt to verify that the command is the correct system exec?  What error do you get? 

[SL_Ong]

This is the error that I get

GetConsoleMode failed, LastError=|6| at C:/Perl/site/lib/Term/ReadKey.pm line 264.

but it's ok when I run at the command prompt.

[cmpowell]

Could you post the actual command are you giving System Exec? 

[falkpl]

Some things to consider (I dont do perl) the error seems to be related to not running in a console.  Try using wait for completion = True and wire up the standard input.  This is just a guess since I dont know anything about the script.  I have had some decent luck with the command line prompt in the past.

Paul

[Joseph_Loo]

Readkey is used for simple terminal control. Evidently when labview takes over control it removes some of the controls the perl script needs to control the keyboard. I suggest you start a dos session that invokes the perl script. This in turn should open up a separate dos window that the perl script can grab control of.

Could you specify the string you used when you invoke the perl script.

[SL_Ong]

Hi,

Thanks for the reply from everyone.

The attached is my code to call Perl script and after calling this, I need to query the Perl Script by sending command like @help. Do they have a way to query the Perl script by sending command like @help and get the return result. 

I think Joseph you are right, but how do I get the return result if I invoke it in a separate dos session.

SL Ong

[NoahR]

Hi SL Ong,

Thanks for contacting National Instruments.  That definitely sounds like a good idea and path that you are heading down right now.  I am not much of a Perl expert either, but I agree with what was said earlier in this thread where setting the "Wait for Completion" input to True is a good way to go when using System Exec.  I hope you are able to get some more input about the actual Perl script soon and good luck with your application!

[Joseph_Loo]

Try piping the results to a file. When it completes, read the results from the file.

[SL_Ong]

Hi,

Yeah, I already tried that but I can't get the script working when called from Labview,

it still give out the error. Anyway, can National Instrument develope something to interface with a Perl script like

a Mathlab node? It could help a lot of people out there, I guess.

But, at the moment, how can I get the script run in command prompt but with Labview running at the background

emulating the keyboard and retrieving the command prompt output? Is that possible?