#include <windows.h>
// #include "currTime.h"

// extern double currTime(); // 使用高精度计时器

static LARGE_INTEGER freq;

static BOOL initFreq()
{
	BOOL ret;
	if ( !QueryPerformanceFrequency( &freq) )
	{	ret=FALSE;	}
	else
	{	ret=TRUE;	}
	return ret;
}

double currTime() // 使用高精度计时器
{
	LARGE_INTEGER performanceCount;
	BOOL result;
	double time=0.0;
	BOOL bRet=TRUE;

	if (freq.QuadPart==0)
	{
		bRet=initFreq();
	}

	if (bRet)
	{
		result=QueryPerformanceCounter(  &performanceCount );
		time= performanceCount.HighPart * 4294967296.0 + performanceCount.LowPart;
		time=time / (   freq.HighPart * 4294967296.0 + freq.LowPart);
	}
	return time;
}