WINCE 5.0 应用程序接收Battery 或者AC实改变消息实例（原）

                                            Gordon  2.14.2007

 

//全局变量以及宏定义

const UINT   WM_USER_NOTIFICATION = RegisterWindowMessage(_T("PowerMes")); 

1、首先在程序初始化的时候起一个处理power/battery changes 的线程；

CreateThread(NULL, 0, PowerNotificationThread, (LPVOID)hDlg, 0, NULL);

• PowerNotificationThread：为线程函数
• hDlg：为所属进程的句柄 

2、处理power/battery changes 线程函数； 

// Report power/battery changes to the battery dialog

static DWORD PowerNotificationThread (PVOID lpParam)

{ 

     DEBUGCHK(lpParam);

     BYTE pbMsgBuf[sizeof(POWER_BROADCAST) + sizeof(POWER_BROADCAST_POWER_INFO)];

     MSGQUEUEOPTIONS msgopts;

 

    HWND hDlg = (HWND)lpParam;

           HANDLE rghWaits[2] = { NULL };

           HANDLE hReq = NULL;

           DWORD dwRet = 1; // 1 is error

 

     // Create our message queue

     memset(&msgopts, 0, sizeof(msgopts));

    msgopts.dwSize = sizeof(msgopts);

    msgopts.dwFlags = 0;

    msgopts.dwMaxMessages = 0;

    msgopts.cbMaxMessage = sizeof(pbMsgBuf);

    msgopts.bReadAccess = TRUE;

 

    rghWaits[0] = CreateMsgQueue(NULL, &msgopts);

     if (!rghWaits[0])

    {

         ERRORMSG(1, (TEXT("Could not create power message queue\r\n")));

         goto EXIT;

     }

 

      // Request notifications

      hReq = RequestPowerNotifications(rghWaits[0], PBT_POWERINFOCHANGE);

    if (!hReq)

        goto EXIT;

    rghWaits[1] = g_hPowerTerminateEvent;

    while(TRUE)

    {

        DWORD dwWaitCode = WaitForMultipleObjects(2, rghWaits, FALSE, INFINITE);

        if(dwWaitCode == WAIT_OBJECT_0)

        {

             DWORD dwSize, dwFlags;

            if (ReadMsgQueue(rghWaits[0], pbMsgBuf, sizeof(pbMsgBuf), &dwSize, 0, &dwFlags))

           {           

               //把消息队列以自定义消息的方式发给应用程序。
               SendMessage(hDlg, WM_USER_NOTIFICATION, 0, (LPARAM) pbMsgBuf);           

           }

           else

           {

              DEBUGCHK(FALSE); // We should never get here

            }

        }

        else

        {

          // got terminate signal

          break;

         }

       }

 

      dwRet = 0; // Success!

 

     EXIT:

           // Clean up

           if (hReq) StopPowerNotifications(hReq);

           if (rghWaits[0]) CloseHandle(rghWaits[0]);         

 

    return dwRet;

}

 

3、接收自定义消息

• evc下 ,在MessageMap 中加入

           ON_REGISTERED_MESSAGE(WM_USER_NOTIFICATION, BatteryOnChange)

• Pb 下，在过程函数中 加入

           case WM_USER_NOTIFICATION:

                      BatteryOnChange((PPOWER_BROADCAST) lParam);

4、处理Battery Change 函数

      void BatteryOnChange(HWND hDlg, const PPOWER_BROADCAST ppb)

      {      

               // if supported by driver, get lifetime info

               if(BatteryDrvrSupportsChangeNotification())

               {

                   //API ，看系统是否支持发BatteryChange Notification;

                   //如果支持，则在此处加入根据PPOWER_BROADCAST 中Power 变化做出相应动作。

                }

       }