Catching error from subprocess.Popen() when executable fails

Question

Could anyone recommend some improvements to the following script such that if the Application.exe file fails, the script ends rather than just becoming hanging indefinitely?

application = r'.\Application.exe'
input_params = '-i Input_1 -j Input_2

process = (application,input_params)
p = subprocess.Popen(" ".join(process),shell= True, stderr=subprocess.STDOUT, stdout = subprocess.PIPE)
p.communicate()

When the application file failed there was no exception thrown, is it possible to have subprocess throw one in such an event?

Edit: Implemented the p.returncode statement.

To revise my original question, when the Application.exe program fails it displays the following window

It is only after I close this window does the program proceed (eg: p.returncode will return the value 255).

Is there a way to either have this window not be displayed or automatically closed or have the program proceed despite having this window displayed?

Regards

György Pákozdi · Accepted Answer · 2019-03-19 15:03:49Z

2

How to catch exception output from Python subprocess.check_output()?

try:
    subprocess.check_output(...)
except subprocess.CalledProcessError as e:
    print e.output

from subprocess import Popen, PIPE

p = Popen(['bitcoin', 'sendtoaddress', ..], stdout=PIPE, stderr=PIPE)
output, error = p.communicate()
if p.returncode != 0: 
   print("bitcoin failed %d %s %s" % (p.returncode, output, error))

answered Mar 19, 2019 at 15:03

György Pákozdi

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1 Comment

JimmyBuffet_Express Over a year ago

Thanks for the link! I implemented the changes and will need to make some changes to my original post.

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