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();
    }
}

 

void CMainFrame::DelayTCount(int tcount)
{
    DWORD dwStart = GetTickCount();
    DWORD dwEnd   = dwStart;
    do
    {
        MSG   msg;
        GetMessage(&msg,NULL,0,0);
        TranslateMessage(&msg);
        DispatchMessage(&msg);
        dwEnd = GetTickCount()-dwStart;
    }while(dwEnd < tcount);
}

 

void CMainFrame::DelayTCount1(double tcount)
{
    LARGE_INTEGER litmp;
    LONGLONG QPart1,QPart2;
    double dfMinus, dfFreq, dfTim;
    QueryPerformanceFrequency(&litmp);
    dfFreq = (double)litmp.QuadPart;// 获得计数器的时钟频率
    QueryPerformanceCounter(&litmp);
    QPart1 = litmp.QuadPart;// 获得初始值
    do
    {
        QueryPerformanceCounter(&litmp);
        QPart2 = litmp.QuadPart;//获得中止值
        dfMinus = (double)(QPart2-QPart1);
        dfTim = dfMinus / dfFreq;// 获得对应的时间值，单位为秒
    }while(dfTim<tcount);
}