1. 粗略延時, 精度為ms

#include <Mmsystem.h>
#pragma comment(lib,"Winmm.lib")

DWORD dwStart = timeGetTime();
while(true)
{
    if( bStop )         //如果延時過程中被終止
        break;
						
    DWORD dwEnd = timeGetTime();
    if( (int)(dwEnd - dwStart) >= m_DelayTime )     //如果已超出延時時間
        break;
						
    Sleep(1);
}
 

2.較精確延時, 精度可為us [以下例子為ms]

#include <stdio.h>
#include <windows.h>

void VsSleepFre(int nDelayMS)      //引數為ms
{
     LARGE_INTEGER nFreq;
     LARGE_INTEGER nBeginTime;
     LARGE_INTEGER nEndTime;
     double time;

     QueryPerformanceFrequency(&nFreq);             //獲取硬體頻率
     QueryPerformanceCounter(&nBeginTime);       //獲取當前計數
     QueryPerformanceCounter(&nEndTime);         //獲取當前計數
	 double TimeUs = 1000000.0 / ((double)nFreq.QuadPart);     //us

	 while(true)
	 {
		QueryPerformanceCounter(&nEndTime);         //獲取當前計數
		time=(double)(nEndTime.QuadPart-nBeginTime.QuadPart) * TimeUs /  (double)1000;      //ms	[可修改此式, 讓精度為us]
		if(time >= nDelayMS)
		{  break;  }
		
		Sleep(1);		//精度為us時，此式需要註釋, 因Sleep引數為ms
	 }
}