[PyKDE] Launching an App from PyQt
Jens.Nie at uos.de
Thu Jan 16 20:32:00 GMT 2003
Am Donnerstag, 16. Januar 2003 18:59 schrieb Jonathan Gardner:
> I'm feeling really stupid about now.
> I think I remember seeing a thread about someone trying to launch an
> application from an application. I am running into that problem right now.
> Coming from a perl world, I never gave a second thought about how to do
> this. Now I am befuddled by the variety of options: system, popen, spawn,
> and so much more.
> I've tried a few of the above with varying amounts of success. I think the
> best was something like:
> os.system("python theapp.py &")
> although I know that this isn't quite right. Anyone have a favorite idiom
> they like to use from PyQt?
Well. There are several ways to do this in python. I don't think this is PyQt
The quick and dirty way will be:
status, output = command.getstatusoutput('Application')
# some error handling of course
this will launch your Application in a subshell. It is only available in Unix
the more elegant and portable way is to use the exec* or spawn* methods. This
is the direct way.
os.spawnl(os.P_NOWAIT, 'pathtoyourApplication', 'pathtoyourApplication',
using os.P_NOWAIT you can prevent your calling application to wait for the
called Application to finish. use os.P_WAIT to wait for it. notice the
/dev/null as the last parameter. As in C the function call has to be
terminated. I think this is the tricky thing using these methods. The exec*
methods work just the same way, and besides the /dev/null statement just as
to process output you can use the os.popen* calls. They return filehandles to
your application, so you can feed it and read from it.
Hope that helped
Dipl.-Phys. Jens Nie
Research & Development/Physics, Rosen Inspection, Lingen
JNie at RosenInspection.net, http://godot.physik.uni-osnabrueck.de/~jnie
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