精确延时，不需考虑整数回转问题

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#define time_after(a,b) ((long)(b) - (long)(a) < 0)#define time_before(a,b) time_after(b,a)#define time_after_eq(a,b) ((long)(a) - (long)(b) >= 0)#define time_before_eq(a,b) time_after_eq(b,a)void delaytime(unsigned long nTime){    unsigned long nEndTime = ::GetTickCount() + nTime;    while(1)       {            if (time_after(::GetTickCount(), nEndTime))            {                               break;            }            MSG msg;            if (PeekMessage(&msg, NULL, 0, 0, PM_REMOVE))            {                   TranslateMessage(&msg);                  DispatchMessage(&msg);              }       }}

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