Windows Mobile 전원 상태 감시

Windows Mobile 전원 상태 감시

Windows Mobile의 경우, 장치의 특성상
일정 시간 입력이 없는 경우 suspend모드로 변경되는 경우가 잦게 일어 난다.

본 포스트에서는 특정 어플리케이션에서 전원상태의 변환을 감지하는 방법에 대해 기술한다.

주제의 핵심은 RequestPowerNotifications() 함수로 요약된다.
이 함수를 통해 전원의 변화 상태를 통지받겠다고 등록하면,
전원 상태가 변경될때마다, 통지를 해준다.
단. 일반 윈도우 메시지 큐로 전달되는것이 아니라 별도의 윈도우 메시지 큐를 생성해야 한다.

// 전원변화상태통지를요청 BOOL RegisterPwNotify() {              m_nBufferSize = (MAX_PATH+sizeof(POWER_BROADCAST))*MAX_MESSAGES;              m_pBuffer = new BYTE[m_nBufferSize];              MSGQUEUEOPTIONS msgOptions = {0};              msgOptions.dwSize = sizeof(MSGQUEUEOPTIONS);              msgOptions.dwFlags = 0;              msgOptions.dwMaxMessages = MAX_MESSAGES;              msgOptions.cbMaxMessage = sizeof(POWER_BROADCAST) + MAX_PATH;              msgOptions.bReadAccess = TRUE;              m_hQueue = CreateMsgQueue(NULL, &msgOptions);              if (! m_hQueue)              {                            MessageBox(g_hWnd, TEXT("Error: CreateMsgQueue"), TEXT("Error!"), MB_OK|MB_APPLMODAL|MB_ICONSTOP);                              return FALSE;              }                HANDLE hThread = CreateThread(0, 0, ThreadProc, 0, 0, 0);              if (! hThread)              {                            MessageBox(g_hWnd, TEXT("Error: CreateThread"), TEXT("Error!"), MB_OK|MB_APPLMODAL|MB_ICONSTOP);                              return FALSE;              }                m_hRequest = ::RequestPowerNotifications(m_hQueue, POWER_NOTIFY_ALL);              if (!m_hRequest)              {                            MessageBox(g_hWnd, TEXT("Error: RequestPowerNotifications"), TEXT("Error!"), MB_OK|MB_APPLMODAL|MB_ICONSTOP);                            return FALSE;              }              CloseHandle( hThread );              return TRUE; }   // Thread를통해위에서생성한메시지큐를감시한다. void Run() {              TCHAR szChar[100];                memset(m_pBuffer, 0, m_nBufferSize);                DWORD dwReaded = 0;                DWORD dwFlags = 0;                while ( TRUE )              {                            memset(m_pBuffer, 0, m_nBufferSize);                            DWORD dwReaded = 0;                            DWORD dwFlags = 0;                            if (::ReadMsgQueue(m_hQueue, m_pBuffer, m_nBufferSize, &dwReaded, MAX_MESSAGES, &dwFlags))                            {                                         if (dwReaded >= sizeof(POWER_BROADCAST))                                         {                                                      WCHAR szCahr[256] = {0};                                                        POWER_BROADCAST* pb = (POWER_BROADCAST*)m_pBuffer;                                                      if ( pb->Message & PBT_POWERINFOCHANGE )                                                      {                                                                   wsprintf(szChar, L"msg=PBT_POWERINFOCHANGE");                                                      }                                                      else if ( pb->Message & PBT_POWERSTATUSCHANGE )                                                      {                                                                   wsprintf(szChar, L"msg=PBT_POWERINFOCHANGE");                                                      }                                                      else if ( pb->Message & PBT_POWERINFOCPBT_RESUMEHANGE )                                                      {                                                                   wsprintf(szChar, L"msg=PBT_RESUME");                                                      }                                                      else if ( pb->Message & PBT_TRANSITION )                                                      {                                                                   wsprintf(szChar, L"msg=PBT_TRANSITION");                                                      }                                                        if ( pb->Flags & POWER_STATE_BOOT )                                                      {                                                                   wsprintf(szChar, L"%s, flag=POWER_STATE_BOOT", szChar);                                                      }                                                      else if ( pb->Flags & PPOWER_STATE_CRITICALOWER_STATE_BOOT )                                                      {                                                                   wsprintf(szChar, L"%s, flag= PPOWER_STATE_CRITICALOWER_STATE_BOOT", szChar);                                                      }                                                      else if ( pb->Flags & POWER_STATE_IDLE )                                                      {                                                                   wsprintf(szChar, L"%s, flag=POWER_STATE_IDLE", szChar);                                                      }                                                      else if ( pb->Flags & POWER_STATE_ON )                                                      {                                                                   wsprintf(szChar, L"%s, flag=POWER_STATE_ON", szChar);                                                      }                                                      else if ( pb->Flags & POWER_STATE_OFF )                                                      {                                                                   wsprintf(szChar, L"%s, flag=POWER_STATE_OFF", szChar);                                                      }                                                      else if ( pb->Flags & POWER_STATE_RESET )                                                      {                                                                   wsprintf(szChar, L"%s, flag=POWER_STATE_RESET", szChar);                                                      }                                                      else if ( pb->Flags & POWER_STATE_SUSPEND )                                                      {                                                                   wsprintf(szChar, L"%s, flag=POWER_STATE_SUSPEND", szChar);                                                      }                                                      if ( pb->Message&PBT_POWERINFOCHANGE )                                                      {                                                                   wsprintf(szChar, L"%s, SystemPowerState=", szChar);                                                      }                                                      else                                                      {                                                                   wsprintf(szChar, L"%s, SystemPowerState=%s", szChar, pb->SystemPowerState);                                                      }                                                      MessageBox(g_hWnd, szChar, TEXT("test"), MB_OK|MB_APPLMODAL|MB_ICONSTOP);                                         }                            }              } }   // 통지등록을제거한다. BOOL UnRegisterPwNotify() {              if ( m_hQueue)              {                            CloseMsgQueue(m_hQueue);                            m_hQueue = NULL;              }              if ( m_hRequest )              {                            StopPowerNotifications( m_hRequest );                            m_hRequest = NULL;              }              return TRUE; }