[python-win32] win32api.FindWindow returns 0 sometimes

[Elias Fotinis]

Running Vista x64, PythonWin 2.6.1 x64, pywin32 214 x64.
win32api.FindWindow sometimes returns 0 instead of raising an exception. I 
suppose that's a bug and will submit it if so. Can anyone verify? I tried 
peeking into the code, but I have no clue about SWIG.  :o)

Example code:
   import win32api
   import subprocess

   subprocess.Popen('notepad')
   while True:
       try:
           w = win32gui.FindWindow('Notepad', None)
           print w
           if w:
               break
       except win32gui.error:
           print 'not found'

Sometimes it works as expected:
   not found
   not found
   not found
   10684490

but sometimes it produces this:
   not found
   not found
   not found
   0
   0
   2623920


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