Pyqt: Execute Command

Question

I am trying to execute command lines in a pyqt application, here is what I am doing so far:

stdouterr = os.popen4(cmd)[1].read()

simple, and for the most part it does work, but when I open up a text file for example, the pyqt programs stops until the text file is closed. Is there a way I can have something like that open and not stop my application.

Edit:

Okay I almost figured it out. I am currently doing this:

Popen(cmd, shell=True,
         stdin=None, stdout=None, stderr=None, close_fds=True)

which does want I want it to, but is there a way to read stdout and stderr after the process is done running?

the os.popen family of functions is deprecated. Use the subprocess module instead. — mata
– mata, Commented Oct 5, 2013 at 17:28

zerubits · Accepted Answer · 2018-03-21 08:08:34Z

2

#my pyqt knowledge is not the best but this works for me... didn't use your example. hope you get it still.
from PyQt5.QtCore import QProcess

process = QProcess()
process.start("yourcommand")
process.waitForStarted()
process.waitForFinished()
process.readAll()
process.close()

'''
from PyQt5.QtCore import QProcess
process = QProcess()
process.start('driverquery')
process.waitForStarted()
process.waitForFinished():
process.waitForReadyRead()
tasklist = process.readAll()
process.close()
tasklist = str(tasklist).strip().split("\\r\\n")
print(tasklist)
'''

edited Mar 21, 2018 at 8:08

answered Mar 21, 2018 at 8:03

zerubits

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1 Comment

rollstuhlfahrer Over a year ago

While this code may answer the question, providing additional context regarding why and/or how this code answers the question improves its long-term value.

shanet · Accepted Answer · 2013-10-11 02:16:35Z

0

You can read from stdout and stderr like so:

process = subprocess.Popen(cmd, shell=True, stdin=None, stdout=subprocess.PIPE, stderr=subprocess.PIPE, close_fds=True)

stdout, stderr = process.communicate()
print stdout
print stderr

edited Oct 11, 2013 at 2:16

answered Oct 6, 2013 at 6:48

shanet

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