Question

After created the window, i started a timer to do sth. the code like this:

SetTimer(hWnd, 1, 40, NULL);  //tick each 40 ms.

I traced the last error, which was 0. but i cannot receive wm_timer! code like this:

case WM_TIMER:
{
     //...
}

My IDE is VS2010, and OS is Windows7, so is there some speical case about my used environment?

P.S. okay i provide more code, it’s a win32 app so in WinMain:

HWND hWnd = CreateWindow(...);  //style : WS_POPUP | WS_VISIBLE , return is good
SetTimer(hWnd, 1, 40, NULL);    //return is good too.
while (GetMessage(&msg, NULL, 0, 0))
{
    TranslateMessage(&msg);
    DispatchMessage(&msg);
}

and the WndProc:

switch(message)
{
case WM_TIMER:
{
    DebugBreak();  //no reaction
}
break;
.......
}

Answer 1

WM_TIMER won’t fire if you’re failing to consume other messages, as they will take priority. One cause of that, for example, is not correctly processing WM_PAINT messages (you must BeginPaint() / EndPaint() )