防止界面卡顿

void DoEvents()
{
    MSG msg;
    // Process existing messages in the application‘s message queue.
    // When the queue is empty, do clean up and return.
    while (::PeekMessage(&msg,NULL,0,0,PM_NOREMOVE))
    {
        if (!AfxGetThread()->PumpMessage())
            return;
    }
}

void Delay(DWORD time)
{
    DWORD t=::GetTickCount();
    while(::GetTickCount() -t < time)
    {
        DoEvents();
    }
}