QueryPerformanceCounter用法

  LARGE_INTEGER beginTime = {0};
 
         QueryPerformanceFrequency(&beginTime);

         
         //电脑CPU时钟频率
         double pcFreq = (double)beginTime.QuadPart/1000000.0;
 
         QueryPerformanceCounter(&beginTime);

 

        //...do sth.

 

         LARGE_INTEGER endTime = {0};
         QueryPerformanceCounter(&endTime);

        //那么下面计算得出的就是这之间的时间间隔了，单位为微秒

        (endTime.QuadPart - beginTime.QuadPart)/pcFreq;

如需毫秒，将下面的

 double pcFreq = (double)beginTime.QuadPart/1000000.0;

改为

 double pcFreq = (double)beginTime.QuadPart/1000.0;

就可以了

同样秒的话去掉后面除的部分