timers.hpp

一个WinCE6。0下的IP phone的源代码

//
// Copyright (c) Microsoft Corporation.  All rights reserved.
//
//
// Use of this sample source code is subject to the terms of the Microsoft
// license agreement under which you licensed this sample source code. If
// you did not accept the terms of the license agreement, you are not
// authorized to use this sample source code. For the terms of the license,
// please see the license agreement between you and Microsoft or, if applicable,
// see the LICENSE.RTF on your install media or the root of your tools installation.
// THE SAMPLE SOURCE CODE IS PROVIDED "AS IS", WITH NO WARRANTIES.
//
#pragma once

#ifndef __TIMER_HPP__
#define __TIMER_HPP__

#include <windows.h>
#include <list.hxx>  //ce::list support

//interface ITimerHandler_t, anybody who wants to create a timer needs to implements
//this interface
class ITimerHandler_t
{
public:    
    
    virtual 
    void
    OnTimerExpires(
        UINT    TimerID
        ) = 0; 

}; 


class Timers_t 
{
private:

    struct TimerHandlerMapping_t
    {
        UINT                TimerIdentifier; 
        ITimerHandler_t*    pTimerHandler; 
    }; 

    typedef ce::list<TimerHandlerMapping_t> TimerList_t;

    HWND            m_ListenerWindow;               //handle of the listener window
    UINT            m_CurrentTimerIdentifier;       //current timer identifier
    TimerList_t     m_TimerList;                    //the timer handler list
    
public:

    Timers_t(); 
    ~Timers_t(); 

    //initializer
    HRESULT
    Initialize(
        HWND ListenerWindow
        ); 

    //Add a pair of timer and timer handler to the list
    HRESULT
    AddTimer(
        UINT                    TimeOutValue, 
        __in ITimerHandler_t*   pTimerHandler, 
        __out UINT*             pTimerIdentifier
        ); 

    //Remove a pair of timer and timer handler from the list        
    HRESULT
    RemoveTimer(
        UINT TimerIdentifier
        ); 

    //This gets called when the listener window gets WM_TIMER mesg
    void
    OnTimerEvent(
        UINT TimerIdentifier
        ); 
       
   
}; 

#endif /* __TIMER_HPP__ */