[python-win32] Opening and enumerating resource many times

[Mark Hammond]

On 30/01/2009 5:09 AM, Gustavo Tabares wrote:
> Hi all,
>
> I'm having a problem when opening and enumerating a network resource
> many times.  For example:
>
> i = 0
>
> while i<  10000:
>         handle =
> win32wnet.WNetOpenEnum(win32netcon.RESOURCE_CONNECTED,
> win32netcon.RESOURCETYPE_ANY, 0, None)
>         partial_nr_list = win32wnet.WNetEnumResource(handle)
>         while partial_nr_list:
>             partial_nr_list = win32wnet.WNetEnumResource(handle)
>         win32wnet.WNetCloseEnum(handle)
>
>         i += 1
>
>
> This eventually fails with:
>
> Traceback (most recent call last):
>   File "C:\qtest.py", line 17, in<module>
>     partial_nr_list = win32wnet.WNetEnumResource(handle)
> MemoryError: VirtualAlloc error in WNetEnumResource
>
>
> I took a look at the source for win32wnet.WNetEnumResource and it
> seems to be doing the correct thing in terms of memory. My application
> isn't doing the above exactly, however it does open/enumerate many
> times. Any ideas on what may be going on?

It appears if we change the memory-free calls in that function to:

VirtualFree(lpBuffer, 0, MEM_RELEASE);	// free the working buffer

The leak goes away.  Unless I hear it is a bad thing, I'll check it in...

Cheers,

Mark.