[python-win32] detect file modification event

[Tim Golden]

[Jim McCoy]

> The only warning I would add here is that you should be aware of the
fact that your watcher 
> thread will block waiting for a change to occur in the directory; you
cannot cancel the 
> blocked ReadDirectoryChangesW call using the standard pywin32
bindings. 

If it causes a problem it might be worth considering one of the other
techniques, eg

http://tgolden.sc.sabren.com/python/win32_how_do_i/watch_directory_for_c
hanges.html#use_findfirstchange

which uses the standard WaitForSingleObject approach which admits of a
timeout.

> We have put together some patches for ReadDirectoryChangesW in
pywin32-204 
> that enable you to do this check using an io completion event so that
you do 
> not end up blocking on the directory you are watching.  I have been a
lazy 
> bum and left these things sitting in a directory waiting to send off
to Mark... 
> I guess I should pass them along.

Please do. I, at least, would love to grapple with it.

Jim
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