CODEWITHSUNDEEP
pythonc++subprocessstdoutpopen
theCember
theCember

Reputation: 71

Capture cout from c++ by subprocess in my pythonscript

in my django python script i run my .cpp program. I want to capture my standard output (cout) in c++ by subprocess in python. In c++ I tried to make a stream which buffers all of my couts and return it in main(), but the only value I can return in main function is integer. So my question is: is there any other possibility to capture c++ couts by python to value in any other way? Thanks in advance!

I tried using popen by:

command = 'g++ -std=c++0x mutualcepepe.cpp -D "bomba = ' + str(strT) + '"'
process = subprocess.Popen(command, stdout=subprocess.PIPE, shell=True)
output = process.communicate()
print output

Other possibility which I used before, was to invoke line below, which gives me output file containing couts from c++.

os.system('g++ -std=c++0x mutualcepepe.cpp -D "bomba = ' + str(strT) + '" -o mutualout')

Upvotes: 2

Views: 1518

Answers (1)

Ben
Ben

Reputation: 6348

In Python3, the simplest way to grab stdout from a subprocess is to use subprocess.getoutput:

import subprocess
output = subprocess.getoutput('ls ./my_folder')
print(output)

This method has been replaced in Python3.5 and the recommended way is now:

result = subprocess.run(['ls', './my_folder'], stdout=subprocess.PIPE)
print(result)
print(result.stdout)

You may want to turn the stdout to a string as well:

result_string = result.stdout.decode('utf-8')

Upvotes: 2

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