question about system exce.vi

[happybird]

I got a question using System exec.VI, attached is my code, when I input "cmd /c help" in the command line, i can not get anything in the standard output, any one can tell me the reason for that, thanks.

Mike 

[AnalogKid2DigitalMan]

just typing help in the command line control yielded expected results on my machine

[mikeporter]

You can drop the cmd /c part. Several versions of Windows ago (like early WinNT) you needed that sort of explicit call to the command processor, but not now.

Mike...

[happybird]

are there anyway I can input the command continuesly? now i can only input one command a time, i can not use a while loop,because the command prompt will apear every time. So can I modifiy it so that it is just like a command prompt embedded in Labview?

[mikeporter]

There's an input that tells the VI to not open the command prompt window (Run Minimized?) that defaults to false. Set it to true and you should be in good shape.

Mike...

[happybird]

I have modified the code (see attached), but it still doesnt work, it apprears that there's an error.

[Dennis_Knutson]

I don't get any error as long as I send a valid command and enter that command in the string control before running the VI. What command are you sending and what kind of error do you get?

[AnalogKid2DigitalMan]

What version of LabVIEW and what OS are you using?

[happybird]

My LV version is 8.0 in WinXP.

[happybird]

When I input "help" ,i can get the correct output, but when I try to enter a sub-directory like" cd Tcl", i will get the error status.