00001 /* 00002 * ============================================================================ 00003 * Name : CCalculationInterfaceDefinition from EComInterfaceDefinition.inl 00004 * Part of : EComCalculator 00005 * Created : 17/11/2003 by Forum Nokia 00006 * Version : 1.0 00007 * Copyright: Nokia Corporation 00008 * ============================================================================ 00009 */ 00010 00011 // Interface's (abstract base class's) destructor 00012 inline CCalculationInterfaceDefinition::~CCalculationInterfaceDefinition() 00013 { 00014 // If in the NewL some memory is reserved for member data, it must be 00015 // released here. This interface does not have any instance variables so 00016 // no need to delete anything. 00017 00018 // Inform the ECOM framework that this specific instance of the 00019 // interface has been destroyed. 00020 REComSession::DestroyedImplementation(iDtor_ID_Key); 00021 } 00022 00023 // Interface's (abstract base class's) static factory method implementation. 00024 // Asks ECOM plugin framework to instantiate appropriate concret plugin 00025 // implementation. 00026 inline CCalculationInterfaceDefinition* 00027 CCalculationInterfaceDefinition::NewL(const TDesC8& aOperationName) 00028 { 00029 // In this example the aOperationName name can be either "sum" or 00030 // "multiply". Implementations define recognition data in their 00031 // "default_data" section of the resource, so that resolver can decide, 00032 // which implementation to choose. For an example resource definition, see 00033 // ..\plugin\101F5465.rss 00034 // This NewL uses default resolver, which just compares given 00035 // aOperationName and default_data string in the implementation 00036 // resource file. 00037 00038 // Define options, how the default resolver will find appropriate 00039 // implementation. 00040 TEComResolverParams resolverParams; 00041 resolverParams.SetDataType(aOperationName); 00042 resolverParams.SetWildcardMatch(ETrue); // Allow wildcard matching 00043 00044 // Find implementation for our interface. 00045 // - KCalculateInterfaceDefinitionUid is the UID of our custom ECOM 00046 // interface. It is defined in EComInterfaceDefinition.h 00047 // - This call will leave, if the plugin architecture cannot find 00048 // implementation. 00049 // - The returned pointer points to one of our interface implementation 00050 // instances. 00051 TAny* ptr = REComSession::CreateImplementationL( 00052 KCalculateInterfaceDefinitionUid, 00053 _FOFF(CCalculationInterfaceDefinition,iDtor_ID_Key), 00054 // _FOFF specifies offset of iDtor_ID_Key so that 00055 // ECOM framework can update its value. 00056 resolverParams); 00057 00058 // The type of TAny* ptr should be CCalculationInterfaceDefinition. 00059 return REINTERPRET_CAST(CCalculationInterfaceDefinition*, ptr); 00060 }
1.6.2