QueryPerformanceFrequency Window下的高精度计时器

最新推荐文章于 2024-09-24 10:35:58 发布

yunccll

最新推荐文章于 2024-09-24 10:35:58 发布

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分类专栏： C++ 文章标签： include

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#include "stdafx.h"

#include <iostream>

#include <windows.h>

#include "AcquireExecutionTime.h"

int _tmain(int argc, _TCHAR* argv[])

	AcquireExecutionTime apt;

	if(apt.IsSupport() == false )

		return -1;

	for(int i=0; i< 10; i++)

		Sleep(100);

		std::cout << i << std::endl;

	printf("%f milisecond\n", apt.GetTimeSpanMS(false));

	for(int i=0; i< 10; i++)

		Sleep(100);

		std::cout << i << std::endl;

	printf("%f milisecond\n", apt.GetTimeSpanMS(false));

	return 0;


// .h
#ifndef ACQUIRE_EXECUTION_TIME_H

#ifndef ACQUIRE_EXECUTION_TIME_H


#include <windows.h>

class AcquireExecutionTime
{

public:
	AcquireExecutionTime(void);
	~AcquireExecutionTime(void);

public:

	double GetTimeSpanSec(bool isReset = false);
	double GetTimeSpanMS(bool isReset = false){ return GetTimeSpanSec(isReset) * 1000; }

	BOOL IsSupport() const { return m_bSupport; }

protected:
	BOOL Reset();


private:
	BOOL			m_bSupport;
	LARGE_INTEGER	m_lFrequency;
	LARGE_INTEGER	m_lStartTime;
	
};
#endif

//.cpp


#include "AcquireExecutionTime.h"

AcquireExecutionTime::AcquireExecutionTime(void)
{
	this->Reset();
}

AcquireExecutionTime::~AcquireExecutionTime(void)
{
}

BOOL AcquireExecutionTime::Reset()
{
	m_bSupport = QueryPerformanceFrequency(&m_lFrequency) == 0 ? FALSE : TRUE;
	if (m_bSupport)
	{
		 return QueryPerformanceCounter(&m_lStartTime);
	}
	return FALSE;
}


double AcquireExecutionTime::GetTimeSpanSec(bool isReset)
{
	if (m_bSupport)
	{
		LARGE_INTEGER	endTime;
		QueryPerformanceCounter(&endTime);
		double ret = (double)(endTime.QuadPart - m_lStartTime.QuadPart)/(double)m_lFrequency.QuadPart;

		if(isReset)
		{
			this->Reset();
		}
		return ret;
	}
	return -1;
}