windows background process

[Podi]

Hi,

I am using Python 2.4.4 on Windows XP SP2.

I am trying to start a process (infinite loop application) in the
background and I've tried several options and none of them seem to
work.

Any help would be much appreciated.

Thanks,
P

1.
# This works on PythonWin interactive window, but the python.exe
process hangs until mycmd.exe process dies

>>os.popen("myc md.exe myargs") # works

if __name__ == '__main__':
os.popen("mycmd .exe myargs") # hangs

2.

>>os.system("my cmd.exe myargs") # hangs, as expected

3.
os.spawnl(os.P_ NOWAIT, 'mycmd.exe', 'myargs') # mycmd.exe not started
os.spawnv(os.P_ NOWAIT, 'mycmd.exe', tuple('myargs') ) # mycmd.exe not
started

4.
# Works, but not portable. My code is expected to run on *nix later on
os.system('star t /B "dummy title" "mycmd.exe" myargs')

[Podi]

Re: windows background process

Some update...

I just found out that the following seems to work,

import subprocess
subprocess.Pope n(' myargs', executable='myc md.exe')

However, it does not work with "my path\\mycmd.exe "

subprocess.Pope n(' myargs', executable='"my path\\mycmd.exe "') # error

[Gabriel Genellina]

Re: windows background process

At Wednesday 22/11/2006 21:27, Podi wrote:

>3.
>os.spawnl(os.P _NOWAIT, 'mycmd.exe', 'myargs') # mycmd.exe not started
>os.spawnv(os.P _NOWAIT, 'mycmd.exe', tuple('myargs') ) # mycmd.exe not
>started

os.spawnl(os.P_ NOWAIT, 'mycmd.exe', 'mycmd.exe', 'first_arg', 'second_arg')
That is, you must provide explicitely the value for argv[0] (executable)
Remember to quote appropiately any parameter with embedded spaces
(including the executable). On Python 2.5 you could use subprocess.list 2cmdline


--
Gabriel Genellina
Softlab SRL

_______________ _______________ _______________ _____
Correo Yahoo!
Espacio para todos tus mensajes, antivirus y antispam ¡gratis!
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[Gabriel Genellina]

Re: windows background process

At Wednesday 22/11/2006 22:05, Podi wrote:

>Some update...
>
>I just found out that the following seems to work,
>
>import subprocess
>subprocess.Pop en(' myargs', executable='myc md.exe')
>
>However, it does not work with "my path\\mycmd.exe "
>
>subprocess.Pop en(' myargs', executable='"my path\\mycmd.exe "') # error

Same as before, executable should be the first argument, so it's seldom used.
Try subprocess.Pope n((full_path_to _mycmd, full_path_to_my cmd, arg1, arg2))


--
Gabriel Genellina
Softlab SRL

_______________ _______________ _______________ _____
Correo Yahoo!
Espacio para todos tus mensajes, antivirus y antispam ¡gratis!
¡Abrí tu cuenta ya! - http://correo.yahoo.com.ar

[Podi]

Re: windows background process


Gabriel Genellina wrote:

os.spawnl(os.P_ NOWAIT, 'mycmd.exe', 'mycmd.exe', 'first_arg', 'second_arg')
That is, you must provide explicitely the value for argv[0] (executable)
Remember to quote appropiately any parameter with embedded spaces
(including the executable). On Python 2.5 you could use subprocess.list 2cmdline
>

Right, this works. Before, I didn't realize that the full path goes to
the 2nd and 3rd argument of spawnl.

Thanks for the help.
P