Using Python to grab output from a C++ program (thru cout)

Question

I have the following code in Python

import subprocess
import time

info = subprocess.STARTUPINFO()
info.dwFlags |= subprocess.STARTF_USESHOWWINDOW
info.wShowWindow = subprocess.SW_HIDE

t1 = time.clock()
h = subprocess.Popen([r"C:\Users\MyName\Desktop\test.exe"], startupinfo=info) 
h.communicate()
t2 = time.clock()-t1

print "Return Code:", h.returncode
print "Duration:", t2

This works great if I am looking for the program's return code but what if I want to grab things that the program simply cout's to the screen and manipulate them as variables in Python?

Amber · Accepted Answer · 2012-06-09 05:33:43Z

1

Use the return values from .communicate().

answered Jun 9, 2012 at 5:33

Amber

531k89 gold badges643 silver badges558 bronze badges

Sign up to request clarification or add additional context in comments.

2 Comments

MyNameIsKhan Over a year ago

Do I need to access it through the communicate() that's already there? what do I output at the end? When I output h.stdout, it returns None

Amber Over a year ago

If you're using communicate() you might as well access it that way. The other option is to pass stdout=subprocess.PIPE to the Popen constructor, which will result in h.stdout being populated. But that's kind of overkill when you're already using communicate().

Collectives™ on Stack Overflow

Using Python to grab output from a C++ program (thru cout)

1 Answer 1

2 Comments

Your Answer

Hot Network Questions

Collectives™ on Stack Overflow

1 Answer 1

2 Comments

Your Answer

Sign up or log in

Post as a guest

Related