[Nuke-python] subprocess.Popen stdout without freezing MainThread?

[Andreas Frickinger]

Hi,

I've looked through some similar threads but couldn't really find the answer to my question. Is it possible to launch a command with subprocess.Popen and get back stdout on a line-by-line base without freezing the MainThread?

Here is a simple example:

proc = subprocess.Popen(['ls','-l'], stdout=subprocess.PIPE)
while True:
    line = proc.stdout.readline()
    if not line: break
    print line

It basically freezes the GUI for the time it's in the while statement. I tried to do this via threading, which seems to ALMOST work:


import subprocess
import threading

proc = subprocess.Popen('ls -l', shell=True)

def test(input):
    print input

def getResult(proc):
    while proc.poll() == None:
        if proc.poll() == 0:
            break
    threading.Thread(name='MainThread' , target=test, args=('test output',)).start()

threading.Thread( None, getResult, args=(proc,) ).start()


This seems to do what I'm expecting, the problem is that I can't get back to the main thread and therefore cannot open up nuke.message or nuke.display as this is only possible from the Main Thread.

Any ideas?


thanks,
andy

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