其实就是 Windows 消息循环

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//消息循环
GetMessage(&msg, NULL, NULL, NULL); //初始化msg
while( msg.message != WM_QUIT )
{
    if( PeekMessage( &msg, NULL, 0, 0 , PM_REMOVE) )
    {
        TranslateMessage( &msg );
        DispatchMessage( &msg );
    }
    else
    {
        tNow = GetTickCount();
        if(tNow - tPre >= 40)
            MyPaint(hdc);
    }
}
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tPre = GetTickCount();