Thomas Bellman wrote: > [EMAIL PROTECTED] wrote: > >> try: >> test = Popen(test_path, >> stdout=PIPE, >> stderr=PIPE, >> close_fds=True, >> env=test_environ) > >> while test.poll() == None: >> ready = select.select([test.stderr], [], []) > >> if test.stderr in ready[0]: >> t_stderr_new = test.stderr.readlines() >> if t_stderr_new != []: >> print "STDERR:", "\n".join(t_stderr_new) >> t_stderr.extend(t_stderr_new) > [...] >> The problem is, that it seems that all the output from the subprocess >> seems to be coming at once. Do I need to take a different approach? > > The readlines() method will read until it reaches end of file (or > an error occurs), not just what is available at the moment. You > can see that for your self by running: > > $ python -c 'import sys; print sys.stdin.readlines()' > > The call to sys.stdin.readlines() will not return until you press > Ctrl-D (or, I think, Ctrl-Z if you are using MS-Windows). > > However, the os.read() function will only read what is currently > available. Note, though, that os.read() does not do line-based > I/O, so depending on the timing you can get incomplete lines, or > multiple lines in one read. > > be carefull that you specify how much you want to read at a time, otherwise it cat be that you keep on reading.
Specify read(1024) or somesuch. In case of my PPCEncoder I recompiled the mencoder subprocess to deliver me lines that end with \n. If anyone can tell me how to read a continues stream than I am really interested. cya -- http://mail.python.org/mailman/listinfo/python-list
