1.参考msdn文档如下

SetTimer

The SetTimer function creates a timer with the specified time-out value.

UINT SetTimer(HWND hWnd,              // handle of window for timer messages
  UINT nIDEvent,          // timer identifier
  UINT uElapse,           // time-out value
  TIMERPROC lpTimerFunc   // address of timer procedure
);

Parameters

hWnd

Handle to the window to be associated with the timer. This window must be owned by the calling thread. If this parameter is NULL, no window is associated with the timer and the nIDEvent parameter is ignored.

nIDEvent

Specifies a nonzero timer identifier. If the hWnd parameter is NULL, this parameter is ignored.

uElapse

Specifies the time-out value, in milliseconds.

lpTimerFunc

Pointer to the function to be notified when the time-out value elapses. For more information about the function, see TimerProc.

If lpTimerFunc is NULL, the system posts a WM_TIMER message to the application queue. The hwnd member of the message'sMSG structure contains the value of the hWnd parameter.

Return Values

If the function succeeds, the return value is an integer identifying the new timer. An application can pass this value, or the string identifier, if it exists, to the KillTimer function to destroy the timer.

If the function fails to create a timer, the return value is zero. To get extended error information, call GetLastError.

Remarks

An application can process WM_TIMER messages by including a WM_TIMER case statement in the window procedure or by specifying a TimerProc callback function when creating the timer. When you specify a TimerProc callback function, the default window procedure calls the callback function when it processes WM_TIMER. Therefore, you need to dispatch messages in the calling thread, even when you use TimerProc instead of processing WM_TIMER.

The wParam parameter of the WM_TIMER message contains the value of the nIDEvent parameter.

CWnd::OnTimer 

afx_msg void OnTimer( UINT nIDEvent );

Parameters

nIDEvent

Specifies the identifier of the timer.

Remarks

The framework calls this member function after each interval specified in the SetTimer member function used to install a timer.

TheDispatchMessage Windows function sends aWM_TIMER message when no other messages are in the application’s message queue.

Note   This member function is called by the framework to allow your application to handle a Windows message. The parameters passed to your function reflect the parameters received by the framework when the message was received. If you call the base-class implementation of this function, that implementation will use the parameters originally passed with the message and not the parameters you supply to the function.

CWnd::KillTimer

BOOL KillTimer( int nIDEvent );

Return Value

Specifies the outcome of the function. The value is nonzero if the event was killed. It is 0 if the KillTimer member function could not find the specified timer event.

Parameters

nIDEvent

The value of the timer event passed to SetTimer.

Remarks

Kills the timer event identified by nIDEvent from the earlier call to SetTimer. Any pending WM_TIMER messages associated with the timer are removed from the message queue.

2.实例