Context indication: To receive context indications client first needs to subscribe a context. See cfclient.h how to subscribe contexts. When a context which is affected by the context subscription made by the client is updated a context indication is informed to client. Context indication consists of the changed context:

        void CClient::ContextIndicationL( const CCFContextIndication& aChangedContext )
    {
    _LIT( KSomeSource, "Source" );
    _LIT( KSomeType, "Type" );
    const CCFContextObject& context = aChangedContext.Context();
    if( context.Source() == KSomeSource && context.Type() == KSomeType )
      {
      // Handle context indication...
      }
    }
       

Action indication: To receive action indications client first needs to subscribe a certain action. See cfclient.h how to subscribe actions. When a rule which has an action, sbscribed by the client, associated to is evaluated to true client will receive an action indication. Action indication contains the action ID which is needed to be executed and all the parameters defined in the rule:

        void CClient::ActionIndicationL( const CCFActionIndication& aActionToExecute )
    {
    _LIT( KSomeActionId, "ActionId" );
    if( aActionToExecute.Identifier() == KSomeActionId )
      {
      const RKeyValueArray& params = aActionToExecute.Parameters();
      TInt paramCount = params.Count();
      for( TInt i = 0; i < paramCount; i++ )
        {
        // Process parameters
        const CCFKeyValuePair& parameter = params[i];
        ...
        // Execute action
        ...
        }
      }
    }
       

Subscription error: If client is subcribing a context which it does not have sufficient capabilities this will lead to a context subscription error. Since contexts can be subscribed before they have been defined context subscription errors will be asynchronously notified everytime:

        void CClient::HandleContextFrameworkError( TCFError aError,
    const TDesC& aSource,
    const TDesC& aType )
    {
    _LIT( KSubscribedSource, "Source" );
    _LIT( KSubscribedType, "Type" );
    if( aError == MCFListener::ESecurityCheckErrorForContextSubscription )
      {
      if( aSource == KSubscribedSource && aType == KSubscribedType )
        {
        // Handle error...
        }
      }
    }
       

-

Since

S60 5.0