Close execution of .exe started with SystemExec

[V.Life]

Hello. I used the SystemExec function to launch a .bat file that opens an application (MyProgram.exe file). Then I see that the application run in the black window (like the command prompt window). In the upper part of the window it's called as "C:\WINDOWS\system32\cmd.exe".

I need to close the execution of MyProgram.exe after a fixed time. I tried some test with the SystemExec function but I haven't found a solution.

Inside the .bat file there is only this line:

@MyProgram.exe -v

[pincpanter]

Use the taskkill program. Launch another cmd with this command line:

cmd /c taskkill /IM MyProgram.exe

Of course, this will abruptly terminate MyProgram.

Generally speaking, the best way would be to be able to send a "message" (e.g. using UDP) to MyProgram.exe that would terminate itself.

[V.Life]

I tried but it opens for an instant a new black window and then close it, but the original one with the execution of the program remains open.

[cordm]

What is the output of taskkill? I tried it and it works with notepad.exe

[pincpanter]

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@V.Life  ha scritto:

I tried but it opens for an instant a new black window and then close it, but the original one with the execution of the program remains open.

---

Try

taskkill /IM etc.

in a standard command prompt window and see what happens

[V.Life]

I used the SystemExec block with this command line:

cmd /c /taskkill /IM MyProgram.exe

The value of return code of the SystemExec block is 1, standard error is "Not found".

[zou]

You can close a window more properly using Windows API:

https://forums.ni.com/t5/LabVIEW/How-to-run-an-exe-as-a-window-inside-a-VI/m-p/4096356/highlight/tru...

[Andrey_Dmitriev]

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@V.Life wrote:

I used the SystemExec block with this command line:

cmd /c /taskkill /IM MyProgram.exe

The value of return code of the SystemExec block is 1, standard error is "Not found".

---

First, you should remove the forward slash / before taskkill:

cmd /c /taskkill /IM MyProgram.exe

Second, you can add the /F switch to forcefully end the process:

cmd /c taskkill /F /IM MyProgram.exe

Refer to the taskkill documentation.

Also, keep in mind that if the process you want to kill is running with higher privileges, you cannot terminate it with taskkill from a program with lower privileges — this is obvious and expected behavior.

[V.Life]

This VI is missing "PostMessage Master.vi".

[V.Life]

Out of Labview I managed to open and close the prompt window using PowerShell. Can I use the SystemExec block to launch it and execute the same commands that I tried out of Labview? Thanks.