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  1. PO
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    <p>Since your message is being posted to the same window that is being resized, <code>DispatchMessage()</code> will send the message to the window's procedure like any other message targetting that window. So either:</p> <p>1) process the message inside of <code>windowProcedure()</code>:</p> <pre><code>LRESULT CALLBACK windowProcedure(HWND hWnd, UINT message, WPARAM wParam, LPARAM lParam) { switch (message) { case WM_SIZE: std::cout &lt;&lt; "window resized" &lt;&lt; std::endl; if (!PostMessage(hWnd, WM_ENV_RESIZED, 0, 0)) { std::cout &lt;&lt; "PostMessage failure!" &lt;&lt; std::endl; std::cout &lt;&lt; "Error code: " &lt;&lt; GetLastError() &lt;&lt; std::endl; } break; case WM_ENV_RESIZED: std::cout &lt;&lt; "env resized" &lt;&lt; std::endl; //... return 0; } return DefWindowProc(hWnd, message, wParam, lParam); } </code></pre> <p>.</p> <pre><code>MSG msg; while (running) { while (PeekMessage(&amp;msg, NULL, 0, 0, PM_REMOVE) ) { TranslateMessage(&amp;msg); DispatchMessage(&amp;msg); } //DirectX render calls } </code></pre> <p>2) if you do not want to process custom messages in your window procedure, then change your message loop to move the <code>TranslateMessage()</code> and <code>DispatchMessage()</code> calls into <code>processWindowsMessage()</code> and only call them for non-custom messages, do not translate/dispatch custom messages:</p> <pre><code>LRESULT CALLBACK windowProcedure(HWND hWnd, UINT message, WPARAM wParam, LPARAM lParam) { switch (message) { case WM_SIZE: std::cout &lt;&lt; "window resized" &lt;&lt; std::endl; if (!PostMessage(hWnd, WM_ENV_RESIZED, 0, 0)) { std::cout &lt;&lt; "PostMessage failure!" &lt;&lt; std::endl; std::cout &lt;&lt; "Error code: " &lt;&lt; GetLastError() &lt;&lt; std::endl; } break; } return DefWindowProc(hWnd, message, wParam, lParam); } </code></pre> <p>.</p> <pre><code>MSG msg; while (running) { while (PeekMessage(&amp;msg, NULL, 0, 0, PM_REMOVE)) processWindowsMessage(&amp;msg); //DirectX render calls } </code></pre> <p>.</p> <pre><code>void processWindowsMessage(MSG *msg) { switch (msg-&gt;message) { case WM_ENV_RESIZED: std::cout &lt;&lt; "env resized" &lt;&lt; std::endl; //... break; default: TranslateMessage(msg); DispatchMessage(msg); break; } } </code></pre>
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    1. POPostMessage only works once?
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    1. USRemy Lebeau
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    1. POPostMessage only works once?
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    1. COGood advice in general. I wanted to say that it doesn't address the OP's concerns but honestly he's off in the weeds so far that these are excellent tips.
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      1. USHerrJoebob
    2. COGiven the original code shown, the only way I could see it not working is if `TranslateMessage()` were modifying the `MSG` into something else that `processWindowsMessage()` did not recognize.
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      1. USRemy Lebeau
    3. COThanks for the reply Remy. I've modified my code as you suggested, but the message is still not caught. I did notice though, that if I put a break on the switch in processWindowsMessage(), wait a bit and then continue running the code, the message is received and processed. This is rather curious behavior and I'm not sure why this is happening...
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      1. USKrienie
 

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