InterfaceDefinition: ECom Interface Definition Example Code

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Description

InterfaceDefinition provides an example ECom interface definition. It declares a base class, CExampleInterface, from which implementations of the interface should derive.

CExampleInterface provides three NewL() functions that allow clients to get respectively:

• the default implementation of the interface, using a specified custom resolver to determine what is the default

• an implementation determined by the default resolver, using a specified string as a resolution parameter

• an implementation determined by the default resolver, using a specified string as a resolution parameter, and passing some data to the implementation

CExampleInterface uses the overloads of REComSession::CreateImplementation(TUid, TUid &) to implement these functions.

CExampleInterface declares one pure virtual function, DoMethodL(), which supplies a service to the client. Implementations must implement this function.

InterfaceDefinition also provides an example of a custom resolver, called CExampleResolver. Its behaviour is the same as ECom's default resolver. Because a resolver is an implementation of the ECom CResolver interface, it requires a registration resource file (100098ea.rss), and an exported factory table (Proxy.cpp).

Class Summary

REComSession

TEComResolverParams

RImplInfoPtrArray

CResolver

Usage

Building InterfaceDefinition exports the files that contain the interface definition, Interface.h and Interface.inl, to epoc32\include\; produces a DLL ExampleResolver.dll; and compiles a resource file ExampleResolver.rsc in the \resource\plugins\ directory.

Implementations of the interface are provided in the Interface Implementation example.

A client program that accesses the interface is provided in the Interface Clientexample.