程序实践系列之使用封装类用于计时

介绍

本节是创建一个CTimeCount类，用于计时，返回值为以秒为单位的时间间隔.

完整类代码

//=========================================================
//
// USING:
//  CTimeCount timeCount;
//	timeCount.Start();
//		..。.......
//  timeCount.End();
//  double dTime=timeCount.GetTime();
//
//=========================================================

#if !defined(__TIMECOUNT_H__)
#define __TIMECOUNT_H__
class CTimeCount
{
	double m_dTime;
	LARGE_INTEGER m_lgiFrequency,m_lgiOldTime,m_lgiNewTime;
public:
	CTimeCount(){}
	~CTimeCount(){}
	void Start()
	{
		QueryPerformanceFrequency(&m_lgiFrequency);
		QueryPerformanceCounter(&m_lgiOldTime);
	}
	void End()
	{	QueryPerformanceCounter(&m_lgiNewTime);
		m_dTime=double(m_lgiNewTime.QuadPart-m_lgiOldTime.QuadPart)
			/double(m_lgiFrequency.QuadPart);
	}
	double GetTime() const
	{
		return m_dTime;
	}
};
#endif  // !defined(__TIMECOUNT_H__)

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