shell command from python plugin

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On 17/09/2012 at 08:02, xxxxxxxx wrote:

Hi everybody,

i am trying to write a plugin for c4d to start an external render or to send a command to our renderfarm to render a specific c4d file. well, i didn't came far. i am stuck with sending a command to the operating system to run a program (wich is our server client). so the basic idea is just simple: by clicking on the plugin, it just sends a command over the system shell. later if this runs i want to parse specific informations of the c4d scene (like start and endframe, file location, render location etc. but that's simple, shouldn't be a problem). I was trying to achieve this via the subprocess library of python.

question now is: 
- what is the right way to send a command to the shell of the os?
- is it even possible to send such commands from within c4d-python?

here is the testcode i've written. i have been trying several variations of this but none did work...
i am on osx 10.6 mac...

here's the testcode:
-----------------------------------------------------------------------------------------------
import c4d
from c4d import gui
import os
import subprocess

def main() :
    print("Hello!") #to test if it's running
    
    subprocess.Popen(['cd /Applications/rprccmd && ./rprccmd'], shell=True)

if __name__=='__main__':
    main()

-----------------------------------------------------------------------------------------------

i wrote a testprogram in c++ via xcode which worked. when i did put it in c++ plugin structure for c4d it didn't work either...

any ideas would be highly appreciated

cheers,
Michael

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On 17/09/2012 at 08:43, xxxxxxxx wrote:

If all you want to do is run another program, use the SDK function GeExecuteProgram - assuming that's available in Python.

What I don't know is whether you can pass a command line to the program using this method.

Steve

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On 29/09/2012 at 08:00, xxxxxxxx wrote:

You can pass a command line as the second parameter, but unfortunately C4D will wrap the second parameter in quotes (probably because it's a Filename and not a String).   It should work if your command line is something that can deal with quotes around it, or any other munging C4D does with a Filename (removal of illegal characters?).  Sadly the quoting is not working for me and I'm having to find ways around it.

There is a more promising "GeExecuteProgramEx" command, which is listed as private...but looks to have the proper form with a String array for args.  Hopefully Maxon will give us something here eventually...

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On 30/09/2012 at 10:02, xxxxxxxx wrote:

Hello VUCX_DE,

read the documentation of subprocess.Popen more carefully. The constructor expects a list of
arguments, not a list of commands. You can use shlex.split to convert a command-string into a list
of arguments (as demonstrated in the subprocess.Popen documentation).

-Niklas

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On 04/10/2012 at 01:19, xxxxxxxx wrote:

Thanks for your posts!
I'll try it!