VC中监测程序运行时间（二）-毫秒级

  1 /*
  2 *    微秒级计时器，用来统计程序运行时间 
  3 *   http://blog.csdn.net/hoya5121/article/details/3778487#comments
  4 *   //整理 [10/16/2013 Duan Yihao]
  5 */
  6 
  7 #pragma once
  8 
  9 #include "stdafx.h"
 10 
 11 
 12 //////////////////////////////////////////////////////////////////////////
 13 class timer  
 14 {
 15 public:
 16     timer();
 17     ~timer();
 18 
 19     void start(void);
 20 
 21     void end(void);   
 22 
 23     DWORD getTime(void) const;
 24 
 25 private:
 26     LARGE_INTEGER m_i64CPUFreq; 
 27     LARGE_INTEGER m_i64Begin;
 28     LARGE_INTEGER m_i64End;
 29     void reset(void);
 30 };
 31 
 32 
 33 //////////////////////////////////////////////////////////////////////////
 34 timer::timer()
 35 {
 36     QueryPerformanceFrequency(&m_i64CPUFreq);
 37 }
 38 
 39 timer::~timer()
 40 {
 41 
 42 }
 43 
 44 void timer::start(void)
 45 {
 46     reset();
 47     QueryPerformanceCounter(&m_i64Begin);
 48 }
 49 
 50 void timer::end(void)
 51 {
 52     QueryPerformanceCounter(&m_i64End);
 53 }
 54 
 55 DWORD timer::getTime(void) const
 56 {
 57     DWORD dwTotalMicrosecond = 0;
 58     LARGE_INTEGER i64TickCount;
 59     i64TickCount.QuadPart = m_i64End.QuadPart - m_i64Begin.QuadPart;
 60     dwTotalMicrosecond = (DWORD) (i64TickCount.QuadPart * 1000000 / m_i64CPUFreq.QuadPart);
 61 
 62     return dwTotalMicrosecond;
 63 }
 64 
 65 void timer::reset(void)
 66 {
 67     m_i64Begin = m_i64End;
 68 }
 69 
 70 
 71 /*
 72 //////////////////////////////////////////////////////////////////////////
 73 //MFC下使用举例：
 74 
 75 void CtestMFCView::OnTest()
 76 {
 77 
 78     // TODO: 在此添加命令处理程序代码
 79     //测试例子
 80 
 81     //计时开始
 82     timer t;
 83     t.start();
 84 
 85     //运算过程
 86 
 87         for(int i = 0; i < 10; i++)
 88         {
 89             int n = i;
 90             for(int i = 0; i < 10000; i++)
 91             {
 92                 int n = i;
 93             }
 94         }
 95 
 96     //计时结束
 97     t.end();
 98 
 99     //输出运行时间
100     CString s;
101     s.Format(_T("%u ms"), t.getTime());
102     AfxMessageBox(s);
103 }
104 
105 */