How to write an interface implementation

To write an interface implementation:

• derive a class from the interface definition

• implement the normal object creation functions: i.e. NewL()/ConstructL() for CBase-derived classes. If the implementation is to receive data from the client (the aConstructionParameters parameter in REComSession::CreateImplementationL()), then the creation function must take a TAny* parameter, through which ECom passes that data.

• implement the pure virtual functions defined by the interface definition, to provide services to clients in an appropriate way

In short, there is little difference from implementing any concrete class based on an abstract base.

Example

The following example declares an implementation of the CExampleInterfaceDefinition interface.

class CExampleIntImplementation : public CExampleInterfaceDefinition
    {
public:
    // Two-phase constructor
    static CExampleIntImplementation* NewL();
    // Destructor
    ~CExampleIntImplementation();
    // Implement CExampleInterfaceDefinition 
    void DoMethodL();

private:
    void ConstructL();
    };