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leon de boer10-Aug-16 17:07
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As always MSDN is the authoritive answer on that

WM_NCPAINT message (Windows)[^]

Quote: "The wParam value can be passed to GetDCEx as in the following example."

You need GetWindowLongPtr with index DWLP_DLGPROC to get the current dialog handler which you probably hold from WM_INITDIALOG. You use CallWindowProc with the held original handler to call the original handler when you need it. Can I offer you a routine to Safely get the dialog procedure because you can get caught with unicode/non unicode dialog windows, that is determined by the function called in the dialog creation and you can have both in the same application.

 WNDPROC SafeGetDialogProc(HWND hwnd)
{
    if(IsWindowUnicode(hwnd))
        return (WNDPROC)GetWindowLongPtrW(hwnd, DWLP_DLGPROC);
    else
        return (WNDPROC)GetWindowLongPtrA(hwnd, DWLP_DLGPROC);
}


In your case you will call the old handler from within NC_PAINT and then do your special drawing routines over what they did and return zero as is required as you processed the call.
Here is a code hack to start with (the handler should really only be retrieved once at WM_INITDIALOG just for speed)
case WM_NCPAINT: {
         WNDPROC OldHandler = SafeGetDialogProc(hwnd);    // Get dialog handler
         CallWindowProc(OldHandler, hwnd, Msg, wParam, lParam);  // Call old handler
         
         // Do your special draw stuff

         return(0);   // Return zero
     }

In vino veritas


modified 10-Aug-16 23:36pm.

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