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First, we will need to add a new member to this class that will represent theBuddyList service. To accomplish this, we add the following line to the classmember definition:BLService* m_pBuddyListservice;The AwarenessList class will also need to receive events from the BuddyListservice so it will inherit the BLServiceListener class:class AwarenessList : public CDialog,public BLServiceListenerFor initializing the m_pBuddyListService member, we will add the lines inExample 7-2 at the end of the AwarenessList constructor.Example 7-2 initial the m_pBuddyListService memberAwarenessList::AwarenessList(STSession* pSTSession, CRect windowRect,CWnd* pParent /* = NULL */): CDialog(AwarenessList::IDD, pParent),m_pAwarenessService(NULL),m_pWatchList(NULL),m_pAwarenessServiceListener(NULL),m_pAwarenessStatusListener(NULL),m_windowRect(windowRect),m_bEnableRemoving(TRUE),m_pChatUI(NULL){...if (pSTSession)m_pBuddyListService = (BLService*)pSTSession->getComponent(BUDDY_LIST_COMP_NAME);if (!m_pBuddyListService)return;}m_pBuddyListService->addBLServiceListener(this);Finally, when the awareness list gets destroyed, it needs to stop listening to theBuddyList service event. To enable this, we will add the following lines in theOnDestroy method:if (m_pBuddyListService){m_pBuddyListService->removeBLServiceListener(this);m_pBuddyListService = NULL;}Chapter 7. BuddyList service 173