Unable to start a process with subprocess Popen()

Gabriel Genellina gagsl-py2 at yahoo.com.ar
Tue Sep 9 20:53:03 CEST 2008


En Mon, 08 Sep 2008 13:35:21 -0300, <dudeja.rajat at gmail.com> escribió:

>            cmd = subprocess.Popen([batchFilePath], \
>                                   shell = True, \
>                                   stdin = subprocess.PIPE,
>                                   stdout = subprocess.PIPE, \
>                                   stderr = subprocess.PIPE \
>                                   )
>            cmd.stdin.close()
>            outPipe, errPipe = PipeThread(cmd.stdout),  
> PipeThread(cmd.stderr)
>            outPipe.run(), errPipe.run()
>            retcode = cmd.wait()
>            out, err = outPipe.getOutput(), errPipe.getOutput()
>
> Although, this solved my problem. But I know there is no need for using
> threading in this problem. This problem could've been solved just by the
> subprocess module.
>
> I'm unnecessarily using the threading module.

Not only that, you're misusing the Thread class. To actually create a  
separate execution thread, you should call outPipe.start() instead of  
outPipe.run() (same for errPipe).
Note that if your batch file emits a large output it really may be  
necesary to use a separate thread to read the output.

-- 
Gabriel Genellina




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