GUI application as DLL. Repaint is blocked.

[Grinchman]

Hello!
I have Qt4 GUI project. It`s implemented as DLL. The main application which uses my DLL calling interface functions from MainThread. Here is the message loop of main application:

while(buckets_rendered<numRects && events!=0)
 {
  while(PeekMessage(&msg, NULL, 0, 0, PM_REMOVE)) 
  {
   TranslateMessage(&msg);
   DispatchMessage(&msg); 
  }
 
  stat = MsgWaitForMultipleObjects(numHandles, handles, FALSE, INFINITE, QS_ALLINPUT);
  if(stat == (WAIT_OBJECT_0 + numHandles))
  {
   continue;
  }
  else // message comes from the events
  {
   id = stat - WAIT_OBJECT_0;
   --events;
 
   // ...
  }
 }

while(buckets_rendered<numRects && events!=0)
 {
  while(PeekMessage(&msg, NULL, 0, 0, PM_REMOVE)) 
  {
   TranslateMessage(&msg);
   DispatchMessage(&msg); 
  }
  
  stat = MsgWaitForMultipleObjects(numHandles, handles, FALSE, INFINITE, QS_ALLINPUT);
  if(stat == (WAIT_OBJECT_0 + numHandles))
  {
   continue;
  }
  else // message comes from the events
  {
   id = stat - WAIT_OBJECT_0;
   --events;
 
   // ...
  }
 }

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All works fine with Qt 4.7.3, but when we use Qt 4.5.3 my DLL is ‘blocked’! When I click some button in my GUI app, nothing happens. But when next I click right mouse button some events occure and I see an effect from the first left mouse button click and an effect from right button click…Why only right mouse button click force repaint? I`m confused…