count_time.h

该文件夹下的代码是我在做人脸检测时的VC源代码

#if !defined(_COUNT_TIME)
#define _COUNT_TIME

#include "afx.h"

static LONGLONG QPartTime;
static void timerBegin()
{
	LARGE_INTEGER litmp; 
	QueryPerformanceCounter(&litmp);
	QPartTime=litmp.QuadPart;// 获得初始值
}


static double getTime()
{
	double dfMinus, dfTim; 
	LARGE_INTEGER litmp; 
	double dfFreq; 
	QueryPerformanceFrequency(&litmp);
	dfFreq = (double)litmp.QuadPart;// 获得计数器的时钟频率
	
	QueryPerformanceCounter(&litmp);
	dfMinus = (double)(litmp.QuadPart-QPartTime);
	dfTim = dfMinus / dfFreq;// 获得对应的时间值，单位为秒
	return dfTim;
}


#endif