VC七种延时方法

VC+七种延时方法：一、1:在头文件*.h中定义一个非零的定时器句柄： int timer1;2：在*.cpp文件的构造函数中初始化句柄： timer1=1;3:首先调用函数SetTimer()设置定时间隔void CMulti_TimerDlg:OnButtonTime1() int iInstallReFlag;iInstallReFlag=SetTimer(timer1,100,NULL);/定时100msif(iInstallReFlag=0)MessageBox(Can not install timer!);4:在应用程序中增加定时响应函OnTimer()，并在该函数中添加响应的处理语句，用来完成到达定时时间的操作； 如完成Sum每隔100ms自加1次，一共自加100次：void CMulti_TimerDlg:OnTimer(UINT nIDEvent) if(nIDEvent=(UINT)timer1) /即添加定时时间到的处理操作Sum+;SetDlgItemInt(IDC_EDIT1,Sum,true);if(Sum=100)KillTimer(timer1);MessageBox(Sum每隔100ms自加1次，一共自加100次已完成!);Sum=0;CDialog:OnTimer(nIDEvent);二、使用sleep函数实现延时,在程序需要延时的地方加入如下代码即可： Sleep(n);/其中n为延时的时间，单位为ms三、1:利用COleDateTime类和COleDateTimeSpan类来实现秒级延时： 在程序需要延时的地方添加如下代码即可：void CMulti_TimerDlg:OnButtonTime3() COleDateTime start_time = COleDateTime:GetCurrentTime(); COleDateTimeSpan end_time = COleDateTime:GetCurrentTime()-start_time; while(end_time.GetTotalSeconds() m_hWnd,WM_UPDATETIME1,0,0);while(End_time.GetTotalSeconds()1) /实现延时1秒 End_time = COleDateTime:GetCurrentTime()-Start_time; return 0; e:在需要的地方开启定时器： void CMulti_TimerDlg:OnButtonTime31() AfxBeginThread(ShowTime3_1_Proc,this);/开启定时器 四、1:利用GetTickCount()函数来实现延时： 在程序需要延时的地方添加如下代码即可：void CMulti_TimerDlg:OnButtonTime4() SetDlgItemInt(IDC_EDIT3,0,true);DWORD dwStart = GetTickCount();DWORD dwEnd = dwStart;do MSG msg; GetMessage(&msg,NULL,0,0); TranslateMessage(&msg); DispatchMessage(&msg);/以上四行是实现在延时或定时期间能处理其他的消息， /虽然这样可以降低CPU的占有率，/但降低了延时或定时精度，实际应用中可以去掉,去掉后误差降低。dwEnd = GetTickCount()- dwStart; while(dwEnd m_hWnd,WM_UPDATETIME2,0,0);/发送消息通知对 /话框该更新时间了dodwStop = GetTickCount();while(dwStop-10SendMessage(WM_UPDATETIME4,0,0); /timeKillEvent(TimerID_1ms); /AfxMessageBox(在此回调函数中安排需要执行的任务); 7：添加自定义定时器定时到的相关处理消息即程序，向timer3中第2点一样： #define WM_UPDATETIME4WM_USER+1003 void OnUpdateTime4(); ON_MESSAGE(WM_UPDATETIME4,OnUpdateTime4) void CMulti_TimerDlg:OnUpdateTime4() struct _timeb timebuffer;char *timeline;/获得毫秒级的时间_ftime( &timebuffer );timeline = ctime(&(timebuffer.time);/格式化时间CString m_Str;m_Str.Format(%.19s.%hu %s, timeline, litm, &timeline20);SetDlgItemText(IDC_EDIT5,m_Str); 8：启动多媒体定时器： void CMulti_TimerDlg:OnButtonTime6() TimerID_1ms = timeSetEvent(wTimerRes_1ms, wAccuracy,(LPTIMECALLBACK) OneMilliSecondProc,(DWORD)this,TIME_ONESHOT); 或 void CMulti_TimerDlg:OnButtonTime61() TimerID1_1ms = timeSetEvent(wTimerRes_1ms, wAccuracy,(LPTIMECALLBACK) OneMilliSecondProc1,(DWORD)this,TIME_PERIODIC); 七、1:使用QueryPerformanceFrequency()和QueryPerformanceCounter()函数来实现ms级或微秒级延时： ms级级延时 (占用CPU高并没响应) void CMulti_TimerDlg:OnButtonTime7() LARGE_INTEGER litmp; LONGLONG QPart1,QPart2;double dfMinus, dfFreq, dfTim; QueryPerformanceFrequency(&litmp); dfFreq = (double)litmp.QuadPart; / 获得计数器的时钟频率QueryPerformanceCounter(&litmp); QPart1 = litmp.QuadPart; / 获得初始值doQueryPerformanceCounter(&litmp); QPart2 = litmp.QuadPart;/ 获得中止值 dfMinus = (double)(QPart2-QPart1); dfTim = dfMinus / dfFreq; / 获得对应的时间值，单位为秒while(dfTim0.001);CString str1;str1.Format(%.12f,(dfTim-0.001)*1000);SetDlgItemText(IDC_EDIT6,str1);MessageBox(1ms延时已到,其误差为文本框中的值,单位为ms!); 微秒级延时 void CMulti_TimerDlg:OnButtonTime71() LARGE_INTEGER litmp; LONGLONG QPart1,QPart2;double dfMinus, dfFreq, dfTim; QueryPerformanceFrequency(&litmp); dfFreq = (double)litmp.QuadPart; / 获得计数器的时钟频率QueryPerformanceCounter(&litmp); QPart1 = litmp.QuadPart; / 获得初始值doQueryPerformanceCounter(&litmp); QPart2 = litmp.QuadPart;/ 获得中止值 dfMinus = (double)(QPart2-QPart1); dfTim = dfMinus / dfFreq; / 获得对应的时间值，单位为秒while(dfTimm_hWnd,WM_UPDATETIME6,0,0);/发送消息通知对话框该更新时间了doQueryPerformanceCounter(&litmp); QPart2 = litmp.QuadPart;/ 获得中止值 dfMinus = (double