Ter, 2005-11-15 às 12:44 +1300, Tim Evans escreveu:
> Paul Malherbe wrote:
> > nephish wrote:
> >
> >> Hey there,
> >>
> >> i have a program that calls another program to execute on a button
> >> click. Its another pygtk app. And i am using the
> >> os.system('python /home/my/myprogram.py') to bring it up. It comes up
> >> ok, but when i close its window, the program that called it up is locked
> >> up. Um, what could i do about this?
> >> thanks.
> >
> > Hi
> >
> > Instead of using os.system(), try:
> >
> > os.spawnv(os.P_WAIT, ...) to execute the child process and wait for it
> > to end or
> > os.spawnv(os.P_NOWAIT, ...) to executr the child process and continue
> > without waiying for it to end.
> >
> > Regards
> > Paul
>
> The variable sys.executable contains the path of the current python
> interpreter. It's good to use it (rather than just 'python') when
> starting other python scripts. On some systems this might be
> '/usr/local/bin/python2.4' for example.
>
> For a more pleasant and powerful API than os.spawn*, you might want to
> look at the 'subprocess' module that is new in Python 2.4. To start a
> process, use:
>
> p = subprocess.Popen([sys.executable, '/home/my/myprogram.py'])
>
> To wait for that process "p" to complete, and get it's return code:
>
> retcode = p.wait()
>
> If you don't want to block, but still want to know when the process has
> completed, this simplest solution is probably be to use a timeout
> handler to poll the process:
>
> def display_process_complete(retcode):
> """Modify the interface to show that a process has completed"""
> pass
>
> def wait_for_process(p):
> retcode = p.poll()
> if retcode is None:
> return True # repeat the timeout
> else:
> gtk.threads_enter()
> try:
> display_process_complete(retcode)
> return False # stop the timeout
> finally:
> gtk.threads_leave()
>
> p = subprocess.Popen([sys.executable, '/home/my/myprogram.py'])
> gtk.timeout_add(500, p)
>
> A more accurate watch could be kept on the subprocesses by handling the
> SIGCHLD signal, but this would be more complex and not portable to
> Windows. I'll leave it as an exercise for the reader :)
http://pygtk.org/pygtk2reference/gobject-functions.html#function-gobject--child-watch-add
--
Gustavo J. A. M. Carneiro
<[EMAIL PROTECTED]> <[EMAIL PROTECTED]>
The universe is always one step beyond logic.
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