Understanding MsgWaitForMultipleObjects

Question

I have a main gui thread that I want to remain responsive to the users action such as moving the dialog around, resizing, etc while I have a background thread doing some tas

Answer 1

You are not processing the incoming message of the UI thread, take a look at Raymond's blog (also see here) for a sample.

  while (true) {
    switch (MsgWaitForMultipleObjects(1, &h,
                         FALSE, INFINITE, QS_ALLINPUT)) {
    case WAIT_OBJECT_0:
      DoSomethingWith(h); // event has been signalled
      break;
    case WAIT_OBJECT_0+1:
      // we have a message - peek and dispatch it
      while (PeekMessage(&msg, NULL, 0, 0, PM_REMOVE)) {
        // TODO:  must handle WM_QUIT; see Raymond's blog for details
        TranslateMessage(&msg);
        DispatchMessage(&msg);
      }
      break;
    default:
      return FALSE; // unexpected failure
    }
  }