MFC下测量程序执行时间

	LARGE_INTEGER   litmp;   
	LONGLONG   QPart1,QPart2;   
	double   dfMinus,   dfFreq,   dfTim;   
	QueryPerformanceFrequency(&litmp); //获得计数器的时钟频率   
	dfFreq   =   (double)litmp.QuadPart;   
	QueryPerformanceCounter(&litmp);   //获得初始值   　　
	QPart1   =   litmp.QuadPart;   
	     
//----------------------------------------------
         // 插入你要测试的代码或函数
//----------------------------------------------
	QueryPerformanceCounter(&litmp);   //获得中止值   
	QPart2   =   litmp.QuadPart;  
	dfMinus = (double)(QPart2 - QPart1);//获得对应的时间值  
	dfTim   =   dfMinus   /   dfFreq;   
	CString strrr;
	strrr.Format("%f", dfTim*1000000);
	strrr += "微秒";
    AfxMessageBox(strrr);

转自：http://www.vckbase.com/document/viewdoc/?id=1301