[pywin32-bugs] [ pywin32-Bugs-1226744 ] win32com: WMPlayer.OCX + threading doesn't work

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Bugs item #1226744, was opened at 2005-06-24 14:12
Message generated for change (Comment added) made by mhammond
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Category: None
Group: None
>Status: Closed
>Resolution: Invalid
Priority: 5
Submitted By: thinkinfinity (thinkinfinity)
Assigned to: Nobody/Anonymous (nobody)
Summary: win32com: WMPlayer.OCX + threading doesn't work

Initial Comment:
I'm trying to create an alarm of sorts.  I narrowed the
problem down to this:

------------------ problem.py ------------------
#!/usr/bin/env python

import threading
from win32com.client import Dispatch

class MPlayer:
    def __init__(self, filename):
        self.filename = filename
        self.mp_handle = Dispatch('WMPlayer.OCX')
       
self.mp_handle.currentPlaylist.appendItem(self.mp_handle.newMedia(filename))
        
    def play(self):
        self.mp_handle.controls.play()
    
mplayer = MPlayer('audiofile.mp3')
threading.Timer(5, mplayer.play).start()
#time.sleep(5)
#mplayer.play()
-------------------------------------------------

It seems like I can't get any other thread than the
main one to do the actual playing:

Interchanging:
threading.Timer(5, mplayer.play).start()

with:
time.sleep(5)
mplayer.play()

doesn't work either so its not just threads.

pywin32 Build 204

Thanks

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

>Comment By: Mark Hammond (mhammond)
Date: 2005-06-26 22:44

Message:
Logged In: YES 
user_id=14198

These are "features" of COM itself and nothing to do with
Python.

In general, you can not simply pass COM objects between
threads - they must be marshalled via
CoMarshalInterThreadInterfaceInStream and all other COM
threading rules must be observed.

In your most recent problem, the issue is almost certainly
the lack of a message loop.  Substitute time.sleep() for
pythoncom.PumpMessages() and it is more likely to work
(although you will need to press Ctrl+C, or call
PostQuitMessage, to exit the message loop.

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

Comment By: thinkinfinity (thinkinfinity)
Date: 2005-06-24 23:30

Message:
Logged In: YES 
user_id=1191227

Actually, now nothing is working for me except when I play
it through clicking a button on a gui.  For example, the
following script doesn't work:

#!/usr/bin/env python

from win32com.client import Dispatch

mp = Dispatch ("WMPlayer.OCX")
TUNE = mp.newMedia ("audiofile.mp3") # here error occurrence
mp.currentPlaylist.appendItem (TUNE)
mp.controls.play ()
raw_input ("Press Enter to stop playing")
mp.controls.stop ()

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

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