Rüdiger Ranft wrote:
Hi all,I need to call some programms and catch their stdout and stderr streams. While the Popen class from subprocess handles the call, I get the results of the programm not until the programm finishes. Since the output of the programm is used to generate a progress indicator, I need a way to acces the values written to stdout/stderr as fast as possible. Beneath is a test which shows what I did TIA Rudi ----8<-------8<-------8<-- iodummy.cpp -8<-------8<--- #include <iostream> #include <unistd.h> int main() { for( int i = 0; i < 10; i++ ) { std::cerr << i << std::endl; sleep(2); } } from subprocess import Popen, PIPE from time import sleep p = Popen('./iodummy',stdin=PIPE, stdout=PIPE, stderr=PIPE) sleep(3) # now I expect '0\n1\n' in stderr, but read() blocks until # the end of iodummy. print p.stderr.read() p.wait() ------------------------------------------------------------------------ -- http://mail.python.org/mailman/listinfo/python-list
======================== Take a look at lib.pdf section 14.1.2 popen3 avoids PIPE problems Steve -- http://mail.python.org/mailman/listinfo/python-list
