window mobile 防止系统休眠代码

window mobile 过一段时间就会自动休眠，下面的代码可以禁止机器自动休眠。

 

代码

[DllImport( " CoreDll.dll " )]
         private   static   extern   void  SystemIdleTimerReset();

         private   static   int  nDisableSleepCalls  =   0 ;
         private   static  System.Threading.Timer preventSleepTimer  =   null ;

         private   static   void  PokeDeviceToKeepAwake( object  extra)
        {
             try
            {
                SystemIdleTimerReset();
            }
             catch  (Exception e)
            {
                 //  TODO
            }
        }


         ///   <summary>
         ///  禁止设备自动关闭电源
         ///   </summary>
         public   static   void  DisableDeviceSleep()
        {
            nDisableSleepCalls ++ ;
             if  (nDisableSleepCalls  ==   1 )
            {
                 //  没隔30秒刷新一次计时器
                preventSleepTimer  =   new  System.Threading.Timer( new  System.Threading.TimerCallback

              (PokeDeviceToKeepAwake),
                 null ,  0 ,  10   *   1000 );
            }
        }

         ///   <summary>
         ///  允许设备自动关闭电源
         ///   </summary>
         public   static   void  EnableDeviceSleep(){
            nDisableSleepCalls -- ;
             if  (nDisableSleepCalls  ==   0 ){
                 if  (preventSleepTimer  !=   null ){
                    preventSleepTimer.Dispose();
                    preventSleepTimer  =   null ;
                }
            }
        }