[python-win32] Shell extension debugging

Tim Golden mail at timgolden.me.uk
Tue Jun 30 14:54:07 CEST 2009


Thomas Heller wrote:
> Gertjan Klein schrieb:
>>>> 2) I see print statements in the source code, but I have no idea where
>>>> they go; I checked the event log, but they are not there. Are they
>>>> logged anywhere? If not, why are they there to begin with?
>>>>
>>>> Any other tip on how to effectively debug this stuff would be most
>>>> welcome as well.
>>> The print statements go into empty space because there is no stdout for
>>> that process.  You can try using the logging module to log to a file, or
>>> you can use ctypes to write to kernel32.OutputDebugString and using a
>>> kernel debug log monitor to read them.
>> The logging module reminds me of Java too much. :(  I think I'll try to
>> write to a file, I have no idea if I have a kernel debug log monitor.
> 
> For stuff like this you should look around at the sysinternals site.  They have
> a DebugView utility that displays these log strings.  ProcessExplorer is also
> a very nice and useful replacement or addition for the task manager.

I second the sysinternals visit. But just in case you fancy the
exercise, you can use Python to trap OutputDebugString calls:

http://timgolden.me.uk/python/win32_how_do_i/capture-OutputDebugString.html

TJG


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