Simple timing function and class to profile program in Windows

WindowsTimer

LONGLONG GetFrequency()
{
	LARGE_INTEGER qpFrequency;
	::QueryPerformanceFrequency(&qpFrequency);
	return qpFrequency.QuadPart;
}

double Tick()
{
	static LONGLONG llFrequency = GetFrequency();
	LARGE_INTEGER qpCounter;
	::QueryPerformanceCounter(&qpCounter);

	return qpCounter.QuadPart / (double)llFrequency;
}


// Example
double c1 = Tick();

::Sleep(3000);

double c2 = Tick();


class CAutoTimer
{
public:
	CAutoTimer()
	{
		start = Tick();

	}

	~CAutoTimer()
	{
		double end = Tick();
		CString strOutput;
		strOutput.Format(_T("Time: %4.2f seconds!"), end-start);
		AfxMessageBox(strOutput);
	}

private:
	double start;
};

// Example
{
  CAutoTimer auto;
  ::Sleep(3000);
}