1:使用QueryPerformanceFrequency()和QueryPerformanceCounter()函數(shù)來實(shí)現(xiàn)ms級或微秒級延時(shí)：
  ms級級延時(shí)

  void CMulti_TimerDlg::OnButtonTime7() 
  {
	LARGE_INTEGER  litmp; 
	LONGLONG       QPart1,QPart2;;
	double         dfMinus, dfFreq, dfTim; 
	QueryPerformanceFrequency(&litmp); 
	dfFreq = (double)litmp.QuadPart; // 獲得計(jì)數(shù)器的時(shí)鐘頻率
	QueryPerformanceCounter(&litmp); 
	QPart1 = litmp.QuadPart; // 獲得初始值
	do{
		QueryPerformanceCounter(&litmp); 
		QPart2 = litmp.QuadPart;// 獲得中止值 
		dfMinus = (double)(QPart2-QPart1); 
		dfTim = dfMinus / dfFreq; // 獲得對應(yīng)的時(shí)間值，單位為秒
	}while(dfTim<0.001);
	CString  str1;
	str1.Format("%.12f",(dfTim-0.001)*1000);
	SetDlgItemText(IDC_EDIT6,str1);
	MessageBox("1ms延時(shí)已到,其誤差為文本框中的值,單位為ms!");
    }

  微秒級延時(shí)
   void CMulti_TimerDlg::OnButtonTime71() 
  {
	LARGE_INTEGER  litmp; 
	LONGLONG       QPart1,QPart2;;
	double         dfMinus, dfFreq, dfTim; 
	QueryPerformanceFrequency(&litmp); 
	dfFreq = (double)litmp.QuadPart; // 獲得計(jì)數(shù)器的時(shí)鐘頻率
	QueryPerformanceCounter(&litmp); 
	QPart1 = litmp.QuadPart; // 獲得初始值
	do{
		QueryPerformanceCounter(&litmp); 
		QPart2 = litmp.QuadPart;// 獲得中止值 
		dfMinus = (double)(QPart2-QPart1); 
		dfTim = dfMinus / dfFreq; // 獲得對應(yīng)的時(shí)間值，單位為秒
	}while(dfTim<0.000001);
	CString  str1;
	str1.Format("%.12f",(dfTim-0.000001)*1000000);
	SetDlgItemText(IDC_EDIT6,str1);
	MessageBox("1微妙延時(shí)已到,其誤差為文本框中的值,單位為微妙!");
  }

2：用來測試函數(shù)Sleep(100)的精確持續(xù)時(shí)間：
  void CMulti_TimerDlg::OnButtonTime72() 
  {
	LARGE_INTEGER litmp; 
    LONGLONG QPart1,QPart2; 
    double dfMinus, dfFreq, dfTim; 
    QueryPerformanceFrequency(&litmp); 
	QueryPerformanceFrequency(&litmp); 
	dfFreq = (double)litmp.QuadPart; // 獲得計(jì)數(shù)器的時(shí)鐘頻率
	QueryPerformanceCounter(&litmp); 
	QPart1 = litmp.QuadPart; // 獲得初始值
        Sleep(100); 
	QueryPerformanceCounter(&litmp); 
	QPart2 = litmp.QuadPart;// 獲得中止值 
	dfMinus = (double)(QPart2-QPart1); 
	dfTim = dfMinus / dfFreq; // 獲得對應(yīng)的時(shí)間值，單位為秒
	CString  str2;
	str2.Format("%.12f",(dfTim*1000-100));
	SetDlgItemText(IDC_EDIT7,str2);
	MessageBox("由于Sleep()函數(shù)自身的誤差，程序每次執(zhí)行的結(jié)果都會(huì)有微小誤差,其誤差為文本框中        的值,單位為ms!");
    }

3：使用QueryPerformanceFrequency()和QueryPerformanceCounter()函數(shù)來實(shí)現(xiàn)ms級或微秒級定時(shí)器

  a：在頭文件中自定義定時(shí)器時(shí)間到響應(yīng)消息 #define WM_UPDATETIME6   WM_USER+1005
  b：在頭文件中聲明WM_UPDATETIME6   消息的響應(yīng)函數(shù)OnUpdateTime6()
 
 //{{AFX_MSG(CMulti_TimerDlg)
	virtual BOOL OnInitDialog();
	afx_msg void OnSysCommand(UINT nID, LPARAM lParam);
	afx_msg void OnPaint();
	afx_msg HCURSOR OnQueryDragIcon();
	afx_msg void OnButtonTime1();
	afx_msg void OnTimer(UINT nIDEvent);
	afx_msg void OnButtonTime2();
	afx_msg void OnButtonTime3();
	afx_msg void OnButtonTime4();
	afx_msg void OnButtonTime31();
	afx_msg void OnButtonTime41();
	afx_msg void OnButtonTime5();
	afx_msg void OnButtonTime51();
	afx_msg void OnButtonTime6();
	afx_msg void OnButtonTime7();
	afx_msg void OnButtonTime71();
	afx_msg void OnButtonTime72();
	afx_msg void OnButtonTime73();
	afx_msg void OnAbout();
	afx_msg void OnButtonTime61();
	//}}AFX_MSG
	void OnUpdateTime6();
	DECLARE_MESSAGE_MAP()
  c：在*.cpp文件中映射WM_UPDATETIME6 消息，并定義響應(yīng)函數(shù)，其代碼如下：
   
    BEGIN_MESSAGE_MAP(CMulti_TimerDlg, CDialog)
	//{{AFX_MSG_MAP(CMulti_TimerDlg)
	ON_WM_SYSCOMMAND()
	ON_WM_PAINT()
	ON_WM_QUERYDRAGICON()
	ON_BN_CLICKED(IDC_BUTTON_TIME1, OnButtonTime1)
	ON_WM_TIMER()
	ON_BN_CLICKED(IDC_BUTTON_TIME2, OnButtonTime2)
	ON_BN_CLICKED(IDC_BUTTON_TIME3, OnButtonTime3)
	ON_BN_CLICKED(IDC_BUTTON_TIME4, OnButtonTime4)
	ON_BN_CLICKED(IDC_BUTTON_TIME3_1, OnButtonTime31)
	ON_BN_CLICKED(IDC_BUTTON_TIME4_1, OnButtonTime41)
	ON_BN_CLICKED(IDC_BUTTON_TIME5, OnButtonTime5)
	ON_BN_CLICKED(IDC_BUTTON_TIME5_1, OnButtonTime51)
	ON_BN_CLICKED(IDC_BUTTON_TIME6, OnButtonTime6)
	ON_BN_CLICKED(IDC_BUTTON_TIME7, OnButtonTime7)
	ON_BN_CLICKED(IDC_BUTTON_TIME7_1, OnButtonTime71)
	ON_BN_CLICKED(IDC_BUTTON_TIME7_2, OnButtonTime72)
	ON_BN_CLICKED(IDC_BUTTON_TIME7_3, OnButtonTime73)
	ON_BN_CLICKED(IDC_ABOUT, OnAbout)
	ON_BN_CLICKED(IDC_BUTTON_TIME6_1, OnButtonTime61)
	//}}AFX_MSG_MAP
	ON_MESSAGE(WM_UPDATETIME6,OnUpdateTime6)
   END_MESSAGE_MAP()

   void CMulti_TimerDlg::OnUpdateTime6()
   {
	struct _timeb timebuffer;
	char *timeline;
	//獲得毫秒級的時(shí)間
	_ftime( &timebuffer );
	timeline = ctime(&(timebuffer.time));
	//格式化時(shí)間
	CString m_Str;
	m_Str.Format("%.19s.%hu %s", timeline, timebuffer.millitm, &timeline[20]);
	SetDlgItemText(IDC_EDIT8,m_Str);
  }

 d：在*.cpp文件中定義一個(gè)線程函數(shù)，用來做定時(shí)器：

  UINT ShowTime6_1_Proc(LPVOID lParam);	//聲明定時(shí)器函數(shù)

  UINT ShowTime6_1_Proc(LPVOID lParam)
  {
	CMulti_TimerDlg* pDlg = (CMulti_TimerDlg*)lParam;
	LARGE_INTEGER  litmp; 
	LONGLONG       QPart1,QPart2;;
	double         dfMinus, dfFreq, dfTim; 
	QueryPerformanceFrequency(&litmp); 
	dfFreq = (double)litmp.QuadPart; // 獲得計(jì)數(shù)器的時(shí)鐘頻率
	QueryPerformanceCounter(&litmp); 
	QPart1 = litmp.QuadPart; // 獲得初始值
	QPart2=QPart1;
	
	while(TRUE)
	{
		QPart1 = QPart2;// 上一次的終止值變成新的起始值
		::SendMessage(pDlg->m_hWnd,WM_UPDATETIME6,0,0);//發(fā)送消息通知對話框該更新時(shí)間了
		do{
			QueryPerformanceCounter(&litmp); 
			QPart2 = litmp.QuadPart;// 獲得中止值 
			dfMinus = (double)(QPart2-QPart1); 
			dfTim = dfMinus / dfFreq; // 獲得對應(yīng)的時(shí)間值，單位為秒
		}while(dfTim<0.000001);
	}
	return 0;
   }
   
  e:在需要的地方開啟定時(shí)器：
   void CMulti_TimerDlg::OnButtonTime73() 
  {
	AfxBeginThread(ShowTime6_1_Proc,this);//開啟定時(shí)器
  }