[python-win32] Python crash after win32com.client.CastTo?

[Nathan Edwards]

> For what it's worth, -1073741819 is hex C0000005, which is 
> STATUS_ACCESS_VIOLATION: a general protection fault.  That's usually a 
> wild address or a null pointer dereference.  Is it possible that one of 
> those last two parameters is actually (in,out) and not just (out)?
> 

The generated function declaration indicates they are both out 
(PyOleMissing object type), but who knows what the library internally 
expects...

 >>> help(theWF2.GetScanDescription2)
Help on method GetScanDescription2 in module 
win32com.gen_py.5F259202-611C-11D1-A9C6-0060977F5C78x0x1x0:

GetScanDescription2(self, sample=<PyOleEmpty object>, period=<PyOleEmpty 
object>, experiment=<PyOleEmpty object>, cycle=<PyOleEmpty object>, 
forChromatogram=<PyOleEmpty object>, scanDescription=<PyOleMissing 
object>, fixedMass=<PyOleMissing object>) method of 
win32com.gen_py.5F259202-611C-11D1-A9C6-0060977F5C78x0x1x0.IFMANWiffFile2 
instance
     method GetScanDescription2

Its only weak evidence, but when I feed in invalid input parameters, 
which for other functions in this library generates exceptions, the 
crash happens anyway (implies that even the parameter checking doesn't 
get done, and since this usually is done first, before any other stuff 
happens, it suggests we don't even make it into the library function 
proper.)

Cheers!

nathan

-- 
Nathan Edwards, Ph.D.
Center for Bioinformatics and Computational Biology
3119 Agriculture/Life Sciences Surge Building #296
University of Maryland, College Park, MD 20742-3360
Phone: +1 301-405-9901
Email: nedwards at umiacs.umd.edu
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