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Asked: 2026-05-11T13:06:48+00:00

Below is my message filter: bool MyFilter::PreFilterMessage(Message %m){ switch(m.Msg){ case WM_CLOSE: case WM_DESTROY: case

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Below is my message filter:

bool MyFilter::PreFilterMessage(Message %m){     switch(m.Msg){     case WM_CLOSE:     case WM_DESTROY:     case WM_NCDESTROY:     case WM_QUIT:         Debug::WriteLine(L'Gone!');         break;     case WM_MOUSEMOVE:         Debug::WriteLine(L'A mouse! Catch! Catch!!! CATCH!!');         break;     }     return false; }

I verified that I am filtering most messages without a problem. However, I am not receiving any messages dispatched after the window’s close button is clicked (WM_CLOSE, WM_DESTROY, WM_NCDESTROY and WM_QUIT). Why is this?

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1 Answer

  1. IMessageFilter.PreFilterMessage() is only called for messages in the message queue. Messages like WM_CLOSE are sent directly to WndProc() with SendMessage(), they bypass the queue. You also won’t get messages like WM_ACTIVATE, WM_GETTEXT, etc. Input events, that’s about it.

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