I need to capture the stdout of a process I execute via subprocess into a string to then put it inside a TextCtrl of a wx application I'm creating. How do I do that?
EDIT: I'd also like to know how to determine when a process terminates
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2 Answers
From the subprocess documentation:
from subprocess import *
output = Popen(["mycmd", "myarg"], stdout=PIPE).communicate()[0]
3 Comments
kettlepot
output = subprocess.Popen("echo hello", stdout=subprocess.PIPE).communicate()[0] gives an error that says "Impossible to find the specified file"; what is the problem?
Walter Mundt
If you want to execute a whole command in a string, you have to pass
shell=True. Otherwise, you need to pass the command and args as a list of strings: subprocess.Popen(["echo", "hello"], stdout=subprocess.PIPE).communicate()[0]
towry
It will blocking the program.
Take a look at the subprocess module.
http://docs.python.org/library/subprocess.html
It allows you to do a lot of the same input and output redirection that you can do in the shell.
If you're trying to redirect the stdout of the currently executing script, that's just a matter of getting a hold of the correct file handle. Off the top of my head, stdin is 0, stdout is 1, and stderr is 2, but double check. I could be wrong on that point.
