如何得到用户往通讯录添加新联系人的事件通知

This is a simplified example of the code lines needed for the Contacts observer.(From Nokia Technical Library)// Application UI owns contact observerclass CEventsAppUi : public CEikAppUi {public: void ConstructL(); ~CEventsAppUi();public: void HandleCommandL(TInt aCommand);private: CEventsAppView* iAppView; // owns CEventsContacts* iContactObserver; };void CEventsAppUi::ConstructL() { BaseConstructL(); // Call base constructor iAppView = CEventsAppView::NewL(ClientRect()); AddToStackL(iAppView); // Create an observer iContactObserver = new(ELeave) CEventsContacts(iAppView); iContactObserver->ConstructL(); }// CEventsContacts implements MContactDbObserver interfaceclass CEventsContacts : public CBase, public MContactDbObserver {public: CEventsContacts(CEventsAppView* aAppView); void ConstructL(); ~CEventsContacts(); // Override the virtual function of MContactDbObserver void HandleDatabaseEventL(TContactDbObserverEvent aEvent);private: CContactDatabase* iContactDb; CContactChangeNotifier* iNotifier; CEventsAppView* iAppView; };CEventsContacts::CEventsContacts(CEventsAppView* aAppView):iAppView(aAppView) { }void CEventsContacts::ConstructL() { // Open the database iContactDb = CContactDatabase::OpenL(); // Register the observer iNotifier = CContactChangeNotifier::NewL(*iContactDb, this); }CEventsContacts::~CEventsContacts() { delete iNotifier; delete iContactDb; }void CEventsContacts::HandleDatabaseEventL(TContactDbObserverEventaEvent) { // The changed item TContactItemId contactItem = aEvent.iContactId; switch (aEvent.iType) { case EContactDbObserverEventContactChanged: // Handle contact changed event break; case EContactDbObserverEventContactDeleted: // Handle contact deleted event break; case EContactDbObserverEventContactAdded // Handle contact added event break; ... default: break; } }