[python-win32] Win32 COM cache problem

[Marc-André Belzile]

The buffer overflow occurs after the __init__file.py has been re-created:

1:40:02 PM	XSI.exe:3836	QUERY INFORMATION	C:\Python25\lib\site-packages\win32com\gen_py\__init__.py	SUCCESS	Attributes: A	
1:40:02 PM	XSI.exe:3836	OPEN	C:\Python25\lib\site-packages\win32com\gen_py\269C4D8C-E32D-11D3-811D-00A0C9AC19A9x0x1x0.py	NOT FOUND	Options: Open  Access: 00010080	
1:40:02 PM	XSI.exe:3836	OPEN	C:\Python25\lib\site-packages\win32com\gen_py\269C4D8C-E32D-11D3-811D-00A0C9AC19A9x0x1x0.pyc	NOT FOUND	Options: Open  Access: 00010080	
1:40:02 PM	XSI.exe:3836	OPEN	C:\Python25\lib\site-packages\win32com\gen_py\269C4D8C-E32D-11D3-811D-00A0C9AC19A9x0x1x0.pyo	NOT FOUND	Options: Open  Access: 00010080	
1:40:02 PM	XSI.exe:3836	CREATE	C:\Python25\lib\site-packages\win32com\gen_py\269C4D8C-E32D-11D3-811D-00A0C9AC19A9x0x1x0\__init__.py	SUCCESS	Options: OverwriteIf  Access: 00120196	
1:40:02 PM	XSI.exe:3836	QUERY INFORMATION	C:\Python25\lib\site-packages\win32com\gen_py\269C4D8C-E32D-11D3-811D-00A0C9AC19A9x0x1x0\__init__.py	SUCCESS	FileFsVolumeInformation	
1:40:02 PM	XSI.exe:3836	QUERY INFORMATION	C:\Python25\lib\site-packages\win32com\gen_py\269C4D8C-E32D-11D3-811D-00A0C9AC19A9x0x1x0\__init__.py	BUFFER OVERFLOW	FileAllInformation	
1:40:03 PM	XSI.exe:3836	WRITE 	C:\Python25\lib\site-packages\win32com\gen_py\269C4D8C-E32D-11D3-811D-00A0C9AC19A9x0x1x0\__init__.py	SUCCESS	Offset: 0 Length: 1024	
1:40:03 PM	XSI.exe:3836	WRITE	C:\Python25\lib\site-packages\win32com\gen_py\269C4D8C-E32D-11D3-811D-00A0C9AC19A9x0x1x0\__init__.py	SUCCESS	Offset: 1024 Length: 1024	
1:40:03 PM	XSI.exe:3836	WRITE	C:\Python25\lib\site-packages\win32com\gen_py\269C4D8C-E32D-11D3-811D-00A0C9AC19A9x0x1x0\__init__.py	SUCCESS	Offset: 2048 Length: 1024	

For some reasons, pywin recreates it if 269C4D8C-E32D-11D3-811D-00A0C9AC19A9x0x1x0.py doesn't exist. This also happens for other typelibs added to the python engine.

-mab

-----Original Message-----
From: python-win32-bounces at python.org [mailto:python-win32-bounces at python.org] On Behalf Of Thomas Heller
Sent: May 30, 2007 12:08 PM
To: python-win32 at python.org
Subject: Re: [python-win32] Win32 COM cache problem

Marc-André Belzile schrieb:
> I dig a bit more and it appears that the python win32 com module requires all target typelibs to be in the app current directory. Otherwise the cache is systematically re-generated anytime a new scripting engine is created. 
> 
> Am I doing something wrong ? Thanks in advance...
> 
> -mab
> 
> -----Original Message-----
> From: python-win32-bounces at python.org 
> [mailto:python-win32-bounces at python.org] On Behalf Of Marc-André 
> Belzile
> Sent: May 28, 2007 6:28 PM
> To: python-win32 at python.org
> Subject: [python-win32] Win32 COM cache problem
> 
> Hi,
> 
> My win32 app is hosting python 2.5 via the scripting ActiveX object. Everything works perfectly but the win32 COM cache behaves strangely if the app current folder (e.g. c:\temp) is different than the application path (e.g. c:\bin\MyApp). At some point when the app needs to create a new python scripting engine, the whole cache gets re-created from scratch which makes things pretty slow. This will not happen if the app is executed from it's normal application folder.
> 
> Is there anything I can do to avoid this problem other than running the app from its normal application folder ?
> 
> Below is an excerpt of a filemon log that shows the cache generation.
> 
> Thanks for your help.
> 
> -mab
> 
> 5:47:26 PM XSI.exe:4964 OPEN 
> C:\Python25\lib\site-packages\win32com\gen_py\269C4D8C-E32D-11D3-811D-
> 00A0C9AC19A9x0x1x0.py NOT FOUND Options: Open  Access: 00010080
> 5:47:26 PM XSI.exe:4964 OPEN 
> C:\Python25\lib\site-packages\win32com\gen_py\269C4D8C-E32D-11D3-811D-
> 00A0C9AC19A9x0x1x0.pyc NOT FOUND Options: Open  Access: 00010080
> 5:47:26 PM XSI.exe:4964 OPEN 
> C:\Python25\lib\site-packages\win32com\gen_py\269C4D8C-E32D-11D3-811D-
> 00A0C9AC19A9x0x1x0.pyo NOT FOUND Options: Open  Access: 00010080
> 5:47:26 PM XSI.exe:4964 CREATE 
> C:\Python25\lib\site-packages\win32com\gen_py\269C4D8C-E32D-11D3-811D-
> 00A0C9AC19A9x0x1x0\__init__.py SUCCESS Options: OverwriteIf  Access: 
> 00120196
> 5:47:26 PM XSI.exe:4964 QUERY INFORMATION 
> C:\Python25\lib\site-packages\win32com\gen_py\269C4D8C-E32D-11D3-811D-
> 00A0C9AC19A9x0x1x0\__init__.py SUCCESS FileFsVolumeInformation
> 5:47:26 PM XSI.exe:4964 QUERY INFORMATION 
> C:\Python25\lib\site-packages\win32com\gen_py\269C4D8C-E32D-11D3-811D-
> 00A0C9AC19A9x0x1x0\__init__.py BUFFER OVERFLOW FileAllInformation
                                                                                                                                                 ^^^^^^^^^^^^^^^ Have you investigated why the above call fails?  To me this looks like pywin cannot determine something about the file, and then recreates it just in case...

Thomas

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