使用QueryPerformanceFrequency 计算程序执行时间

QueryPerformanceFrequency(  __out LARGE_INTEGER *lpFrequency  );  //返回定时器的频率

BOOL QueryPerformanceCounter(LARGE_INTEGER *lpPerformanceCount);  //是返回定时器当前计数值

代码:

/////////////////////////////////////////////////
#include <iostream>
#include <windows.h>
using namespace    std;
////////////////////////////////////////////////
void main()
{
    _LARGE_INTEGER time_start;    /*开始时间*/
    _LARGE_INTEGER time_over;        /*结束时间*/
    double dqFreq;                /*计时器频率*/
    LARGE_INTEGER f;            /*计时器频率*/
    QueryPerformanceFrequency(&f);
    dqFreq=(double)f.QuadPart;
    QueryPerformanceCounter(&time_start);
    Sleep(1000);/*循环耗时*/
    QueryPerformanceCounter(&time_over); 
    cout<<((time_over.QuadPart-time_start.QuadPart)/dqFreq)<<endl;//单位为秒,精度为1000 000/(cpu主频)微秒
}

 


         

posted @ 2012-07-30 13:11  冷夜 - 网游编程技术  阅读(436)  评论(0编辑  收藏  举报