On Jun 21, 6:32 pm, Ratko <[EMAIL PROTECTED]> wrote: > Hi all, > > I have a python gui app that launches multiple applications using > subprocess.Popen class and prints their output in the gui (using > PIPEs, threads and wxPython). Everything works great but the problem > is that some applications should run in the background (ie they don't > close when the gui closes) so next time when you start the gui it will > not have a handle on those processes that are still running and > therefore won't be able to print their output. > > So, I was wondering if there is any way to "preserve" the Popen object > of those background processes and reload them when the gui is > restarted? Ideally I would like to have the whole Popen object > preserved but I could also get by with just the Popen.stdout file > object. I can save the Popen.stdout.fileno() integer because that's > what I use in os.read() to read the output anyway but that doesn't > work. > > I have doubts that this could even conceptually work but I thought I'd > try asking anyway. I don't have a full understanding of how processes > and pipes work on the system level... > > Thanks, > Ratko
Sounds like you might want to consider running the backround task as either a service or daemon and communicate via a TCP/IP connection or a named pipe rather than using STDIN/OUT. Actually you could use either idea without actually setting up a daemon. Also, you're generally supposed to wait() for your children to die (even if you stop the gui) rather than let them become zombies. Cheers, Aaron -- http://mail.python.org/mailman/listinfo/python-list
