使用QueryPerformanceFrequency 计算程序执行时间

来源：互联网发布：php视频用什么软件编辑：程序博客网时间：2024/05/22 13:27

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}