[python-win32] Silent crashes in calls to a COM object in Python

Deniz Pelvan i_pelvan at hotmail.com
Tue Apr 24 06:55:38 CEST 2012

Hello Mark,As I mentioned, I ran my COM interface with another Win32 test app under a MSVC debugger for hours without any problem. I attached a debugger to the Python process but with Python, the script goes all the way to that call, waits about a minute in that call and then without throwing any exceptions or errors, the script stops running (i.e. the next line in the script never gets called) and Python drops back to the prompt. Nothing gets caught by the debugger. I was wondering if there are any options either in the Python interpreter or in pywin32 (or maybe a debug version) that can show what is happening internally, especially over the COM dispatch...Thanks in advanceDeniz

> Date: Tue, 24 Apr 2012 11:08:12 +1000
> From: skippy.hammond at gmail.com
> To: i_pelvan at hotmail.com
> CC: python-win32 at python.org
> Subject: Re: [python-win32] Silent crashes in calls to a COM object in Python
> Python and pywin32 don't impose any time limits for timeouts and I can't 
> think of what could cause this other than (say) an exception handler in 
> your script that ignores exceptions and terminates the process.  Even if 
> Python actually crashed I'd expect Windows to show the "app crashed" 
> dialog.  If you have MSVC you could try running the python process under 
> it to see if it reports anything strange.
> Mark
> On 24/04/2012 8:09 AM, Deniz Pelvan wrote:
> >
> > Hello guys,I am having trouble with the Python interpreter crashing
> > silently (no exceptions or errors thrown) when I make a call to a
> > very CPU-intensive method in my COM/ATL component using Pywin32. The
> > method is an FFT analysis for audio files and hits about 25% CPU on a
> > single core and runs for about 1 minutes. I have tested the COM
> > method intensively via normal win32 applications and there are no
> > problems with it (I can run the same method over and over again 1000s
> > of times in a win32 app).- Also the same Python script (with a call
> > to this COM method) will run successfully on different machines and
> > will fail at the same machine only randomly (i.e. on some machines,
> > it never fails, while on others, it has ~50% failure rate). - This
> > specific method is the most CPU-intensive one in the COM component
> > and other methods do not fail on any of the machines. Because of
> > this, I think the problem might have something to do with either the
> > CPU usage or a timeout feature on Python or pywin32. Are there any
> > tools that would help me narrow down the cause or maybe increase the
> > CPU/time limits for Python/PyWin32? I haven't seen anything in the
> > documentation that'd help.Thanks in advanceDeniz Pelvan
> > _______________________________________________ python-win32 mailing
> > list python-win32 at python.org
> > http://mail.python.org/mailman/listinfo/python-win32
> >
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