[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. The window was never created because the application had returned a non zero value when it was notified of window creation, which effectively destroys the window and returns failure for window creation. See CBTProc Function on MSDN. Fixes bug #4461.

Author: mjmartin
Date: Thu Apr 29 15:41:32 2010
New Revision: 47059

URL: http://svn.reactos.org/svn/reactos?rev=47059&view=rev
Log:
[win32k]
- Fix a problem where application that used WH_CBT hook procedures were receiving destroy
window notification on windows that were never created. The window was never created
because the application had returned a non zero value when it was notified of window
creation, which effectively destroys the window and returns failure for window creation.
See CBTProc Function on MSDN. Fixes bug #4461.

Modified:
    trunk/reactos/subsystems/win32/win32k/ntuser/window.c

Modified: trunk/reactos/subsystems/win32/win32k/ntuser/window.c
URL:
http://svn.reactos.org/svn/reactos/trunk/reactos/subsystems/win32/win32k/nt…
==============================================================================
--- trunk/reactos/subsystems/win32/win32k/ntuser/window.c [iso-8859-1] (original)
+++ trunk/reactos/subsystems/win32/win32k/ntuser/window.c [iso-8859-1] Thu Apr 29 15:41:32
2010
@@ -2468,7 +2468,23 @@
 
 CLEANUP:
    if (!_ret_ && Window && Window->Wnd && ti)
+   {
+      ULONG SavedHooks;
+      /* HACK: co_UserDestroyWindow will call CBT proc with code HCBT_DESTROYWND.
+         Applications can choke on this as a hwnd was never returned from this call */
+      /* Save the flags */
+      SavedHooks = ((PTHREADINFO)PsGetCurrentThreadWin32Thread())->fsHooks;
+
+      /* Temporary remove the flag */
+      ((PTHREADINFO)PsGetCurrentThreadWin32Thread())->fsHooks &=
~HOOKID_TO_FLAG(WH_CBT);
+
+      /* Destroy the window */
       co_UserDestroyWindow(Window);
+
+      /* Restore the flag */
+      ((PTHREADINFO)PsGetCurrentThreadWin32Thread())->fsHooks = SavedHooks;
+   }
+
 //      UserFreeWindowInfo(ti, Window);
    if (Window)
    {