Capture output from stderr
klappnase at web.de
Wed Aug 6 02:26:49 CEST 2003
I am trying to program a Tkinter application for linux, so I want to
run a shell command from the gui and capture its output on the fly
while the process is still running in order to display the progress
messages in a toplevel window so the user may watch what is going on
(the execution of the shell command may take a few minutes). Because
the output is printed to stderr I thought I should use a popen2.Popen4
instance for that, like:
self.pp = popen2.Popen4("exec cmd")
I tried something like
msg = self.pp.fromchild
newmsg = msg.read(100)
to get the output, but this way the process gets horribly slowed down
and even if it worked it would be hard to check the whole output for
the information that I want to be displayed.
I think I would need something like
but this only returns after the process has finished.
Does anyone know how to handle this?
I would be very thankful for any help.
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