Re: [ros-dev] [ros-diffs] [mjmartin] 47059: [win32k] - Fix a problem where application that used WH_CBT hook procedures were receiving destroy window notification on windows that were never created.

[Michael Martin]

It could be, ill look at it a bit. Thou I havent seen that bug since i made the change,
though it did show rarely.
Sorry but the bug that I said that patch fixed isn't fully correct.

We have other issues with hooks, being:

1. Hooks are called more times then they should be. When co_HOOK_CallHooks is called in
co_IntCreateWindowEx, the application that installed the hook calls CallNextHookEx, this
leads the the hook proc being called again. Havent looked at this yet.

2. A bigger problem is when two CBT hooks are installed, which im looking into now. After
installing the second CBT hook, im seeing cases where co_HOOK_CallHooks is returning a non
zero value though the Hook proc is returning a zero value. I beleive this is the real
cause of the bug i thought the commit fixed. 

Damnest of things is that its returning the hook that is returned in the call to 
Hook = IntGetFirstValidHook(Table, HookId)
in function co_HOOK_CallHooks line 345.
This value is being returned from the call KiCallUserMode. So maybe some stack trashing
going on.

Michael


>   Date: Thu, 29 Apr 2010 18:56:36 -0500
>  From: jimtabor.rosdev(a)gmail.com
>  To: ros-dev(a)reactos.org
>  Subject: [ros-dev] [ros-diffs] [mjmartin] 47059: [win32k] - Fix a problem	where
> application that used WH_CBT hook procedures were	receiving destroy window notification on
> windows that were	never created.
>  
>  Michael!
>  
>  Good work!!!!
>  
>  Do you think this might be one of the reasons we are reentering
>  co_UserDestroyWindow? The DCE is cleared and (not cached) at first
>  then we go back a second time and hit the assert...?
>  
>  http://www.reactos.org/bugzilla/show_bug.cgi?id=5320
>  
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