From Forum Nokia Wiki

We can receive events about contact database changes in our application, the MContactDbObserver base class must be inherited and the virtual function HandleDatabaseEventL() must be implemented. This function is called when a contact database event occurs.

If you are not familiar with Observer Pattern, please refer to [Observer Section] on Wiki.

Header required:

#include <CNTDBOBS.H> //MContactDbObserver
#include <cntdb.h> // CContactDatabase, CContactChangeNotifier

Library needed:

LIBRARY  cntmodel.lib // CContactDatabase, CContactChangeNotifier

Source code:

class CContactDatabaseObserver : public CBase, MContactDbObserver
       {
 
 
public:
 
        CContactDatabaseObserver();
 
        // we need to override the virtual function from the base class //
 
        virtual void HandleDatabaseEventL( TContactDbObserverEvent  aEvent );
 
 
         };
 
 
// Handle contact database events //
 
void CContactDatabaseObserver::HandleDatabaseEventL(TContactDbObserverEvent 
 
aEvent)
         {
	    switch(aEvent.iType)
            {
            //if any contact deleted in phonebook
	     case EContactDbObserverEventContactDeleted:
                break;
           //event if any contact changed
          case EContactDbObserverEventContactChanged:		
		{}
             break;
           //event if any new contact added to phonebook
          case EContactDbObserverEventContactAdded:
          {}
          break;
            //check TContactDbObserverEventType for more events.
 
            }
         } 
 
//We must also create the CContactChangeNotifier object to register itself to 
//receive events.
 
 
CContactDatabase* ContactDatabase = CContactDatabase::OpenL();
 
// Here iContactDatabaseObserver is a CContactDatabaseObserver pointer //
 
CContactChangeNotifier* DatabaseNotifier = 
CContactChangeNotifier::NewL(*ContactDatabase , this);// Changes by aamitgupta on date 5/06/2008

Related Links:

• Getting contact info from default database