c++ 计时

//z 2014-06-19 17:18:49 L.195'24071 BG57IV3@XCL T1202481319.K.F636940351 [T22,L436,R14,V351]
c++ timer 计时
//z 2014-06-19 17:18:49 L.195'24071 BG57IV3@XCL T1202481319.K.F636940351 [T22,L436,R14,V351]
//z 2014-06-20 14:28:39 L.194'34281 BG57IV3@XCL T816588223 .K.F1994950968[T65,L612,R42,V717]

class ZTimer
{
public:
	ZTimer()//z is2120@BG57IV3
	{
		Init();
	}

	explicit ZTimer(const char* desc)
	{
		Init();
		if (desc != NULL)
		{
			strcpy_s(_desc, desc);
		}
	}

	void Reset()
	{
		++_resetCnt;
		QueryPerformanceCounter(&_startCount);
	}

	double Elapsed()
	{
		return Elapsed(NULL);
	}

	double Elapsed(char* subDesc)
	{
		QueryPerformanceCounter(&_endCount);
		double fElapsedTime = (_endCount.QuadPart - _startCount.QuadPart) * 1000.0 / _frequency.QuadPart;
		char cBuff[256] = { 0 };
		if (subDesc == NULL)
		{
			sprintf_s(cBuff, "Elapsed %s.T#%-2d.R#%-2d: %.3f", _desc, _cnt++, _resetCnt, fElapsedTime);
		}
		else
		{
			sprintf_s(cBuff, "Elapsed %s.%s T#%-2d.R#%-2d: %.3f", _desc,subDesc, _cnt++, _resetCnt, fElapsedTime);
		}
		
		OutputDebugStringA(cBuff);

		return fElapsedTime;
	}

	~ZTimer()
	{
		Elapsed();
	}

private:
	void Init()
	{
		memset(_desc, 0, sizeof(_desc));
		_startCount.QuadPart = 0;
		_endCount.QuadPart = 0;
		_cnt = 0;
		_resetCnt = 0;
		QueryPerformanceFrequency(&_frequency);
		QueryPerformanceCounter(&_startCount);
	}

private:
	LARGE_INTEGER _frequency;
	LARGE_INTEGER _startCount;
	LARGE_INTEGER _endCount;
	char _desc[64];
	int _cnt;
	int _resetCnt;
};

//z 2014-06-20 14:28:39 L.194'34281 BG57IV3@XCL T816588223 .K.F1994950968[T65,L612,R42,V717]