C++计时

C++一个很好的计时方法

//记时
	LARGE_INTEGER t1;
	LARGE_INTEGER t2;
	LARGE_INTEGER f;
	QueryPerformanceFrequency(&f);
	QueryPerformanceCounter(&t1);
	Sleep(100);
	QueryPerformanceCounter(&t2);
	double time;
	time = (double)(t2.QuadPart-t1.QuadPart)/(double)f.QuadPart;
	time *= 1000;
	CString tep;
	tep.Format(_T("耗时：%f") , time);
	SetDlgItemText(IDC_STATIC,tep);