[pywin32-bugs] [ pywin32-Bugs-1085454 ] Py 2.4 + MS Excel COM --> crash

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Bugs item #1085454, was opened at 2004-12-15 09:47
Message generated for change (Comment added) made by mhammond
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Category: com
Group: None
>Status: Open
>Resolution: None
Priority: 5
Submitted By: sitecap (sitecap)
Assigned to: Nobody/Anonymous (nobody)
Summary: Py 2.4 + MS Excel COM --> crash

Initial Comment:
Any code that tries to dispatch an Excel (2003)
application ends up crashing Python 2.4.

(Used bForDemand=1 in makepy to generate MS Excel 11.0
Object Library, otherwise makepy itself crashes.)



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>Comment By: Mark Hammond (mhammond)
Date: 2005-01-26 20:32

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Thanks Roger - I'll dig a little deeper on this.

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Comment By: Roger Upole (rupole)
Date: 2005-01-26 16:27

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Python still crashes when you invoke one of the methods 
whose generated code caused the original crash. Looks to be 
related to this bug in the tokenizer:
www.python.org/sf/1089395
It hits an assertion failure on lines longer than 512.
For a workaround, remove the mbcs encoding tag in genpy.py
and makepy works correctly even with bForDemand=0.



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Comment By: Mark Hammond (mhammond)
Date: 2005-01-25 20:53

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gencache.py (1.30)
makepy.py (1.19)

From that checkin message:

Avoid crashes on Python 2.4 by defaulting to bForDemand=True
- ie, each typelib actually creates a "skeleton" Python
package, and populates the package as each interface is
requested.

Cause of the underling crash is that the generated .py
causes an overflow as the byte-code is generated - something
in 2.4 bloated the byte-code for these modules.


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Comment By: barney dalton (barneyd)
Date: 2004-12-16 21:07

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I'm having a similar problem with Excel 2002 in Python 2.4.
The script:

#>

from win32com.client import gencache
gencache.EnsureModule('{00020813-0000-0000-C000-000000000046}',
0, 1, 3, bForDemand=1)

import win32com.client

ExcelApp=win32com.client.Dispatch("Excel.Application")

#<

Causes a access violation in python

AppName: python.exe	 AppVer: 0.0.0.0	 ModName: ntdll.dll
ModVer: 5.1.2600.1217	 Offset: 00033905




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