Wait on HANDLE while processing messages for a specific HWND

Question

I have a wait handle (CreateEvent) and a window handle (CreateWindow). On the UI thread, I want to process messages for that HWND only until the wait handle is signaled.

GetMessage will let me receive messages for a single window handle, but it doesn't know anything about wait handles.

MsgWaitForMultipleObjectsEx will let me wait for either the wait handle or a window message, but a message sent to any window on the current thread will unblock it -- there's no way to filter by HWND.

I can't just string those two together. If a message for a window unblocks the MsgWaitForMultipleObjectsEx call and I use GetMessage for a different HWND, the message remains in the queue, and the next MsgWaitForMultipleObjectsEx call returns immediately due to the unprocessed message. Loop ad infinitum.

Answer 1

DWORD dwRet;
do
{
    dwRet = MsgWaitForMultipleObjectsEx(1, &hEvent, INFINITE, QS_ALLINPUT, 0);
    if (dwRet == (WAIT_OBJECT_0+1))
    {
        while (PeekMessage(&msg, hWnd, 0, 0, PM_REMOVE))
        {
            TranslateMessage(&msg);
            DispatchMessage(&msg);
        }
    }
    // ...
}
while (dwRet != WAIT_OBJECT_0);