VC ATL, How to access a member variable of a class from other class

How to access a member variable of a class from other class

Author	Message
Jaime Stuard #1 / 3	How to access a member variable of a class from other class Hi all... To state simply the problem. I have an ATL object that has 2 interfaces, each one has the corresponding class, for example, CObject_1 IObject_1 CObject_2 IObject_2 CObject_1 need to access a public member variable in CObject_2, how can I do it? I tried declaring in CObject_1 an object of type CObject_2 but it didn't compile because of the definition of the CObject_2 class... for instance: class ATL_NO_VTABLE CObject_2 : public CComObjectRootEx<CComSingleThreadModel>, public CComCoClass<CObject_2, &CLSID_Object_2>, public IDispatchImpl<IObject_2, &IID_IObject_2, &LIBID_ICFILELib> { DECLARE_NO_REGISTRY() DECLARE_NOT_AGGREGATABLE(CObject_2) DECLARE_PROTECT_FINAL_CONSTRUCT() BEGIN_COM_MAP(CObject_2) COM_INTERFACE_ENTRY(IObject_2) COM_INTERFACE_ENTRY(IDispatch) END_COM_MAP() Quote: }; CObject_1 has the same skeleton Any one can help? Thanks a los in advance Jaime
Thu, 19 Aug 2004 08:58:18 GMT

Frederic Clau #2 / 3	How to access a member variable of a class from other class Use an interface property to expose your member variable. With COM, every single piece of communication is done via interfaces. There is no other communication mechanism. -- Frederic Claux Quote: > Hi all... > To state simply the problem. I have an ATL object that has 2 interfaces, > each one has the corresponding class, for example, > CObject_1 > IObject_1 > CObject_2 > IObject_2 > CObject_1 need to access a public member variable in CObject_2, how can I do > it? I tried declaring in CObject_1 an object of type CObject_2 but it didn't > compile because of the definition of the CObject_2 class... for instance: > class ATL_NO_VTABLE CObject_2 : > public CComObjectRootEx<CComSingleThreadModel>, > public CComCoClass<CObject_2, &CLSID_Object_2>, > public IDispatchImpl<IObject_2, &IID_IObject_2, &LIBID_ICFILELib> > { > DECLARE_NO_REGISTRY() > DECLARE_NOT_AGGREGATABLE(CObject_2) > DECLARE_PROTECT_FINAL_CONSTRUCT() > BEGIN_COM_MAP(CObject_2) > COM_INTERFACE_ENTRY(IObject_2) > COM_INTERFACE_ENTRY(IDispatch) > END_COM_MAP() > }; > CObject_1 has the same skeleton > Any one can help? > Thanks a los in advance > Jaime
Fri, 20 Aug 2004 16:37:34 GMT

Claes Bergefal #3 / 3	How to access a member variable of a class from other class You need to declare your CObject_2 like this: CComObject<CObject_2> *pObject2; Then create it in CObject_1::FinalConstruct like this: CComObject<CObject_2>::CreateInstance(&pObject2); pObject2->AddRef(); Don't forget to free it in CObject_1::FinalRelease pObject2->Release(); After this pObject2 can be used as an ordinary C++ pointer. /claes Quote: > Hi all... > To state simply the problem. I have an ATL object that has 2 interfaces, > each one has the corresponding class, for example, > CObject_1 > IObject_1 > CObject_2 > IObject_2 > CObject_1 need to access a public member variable in CObject_2, how can I do > it? I tried declaring in CObject_1 an object of type CObject_2 but it didn't > compile because of the definition of the CObject_2 class... for instance: > class ATL_NO_VTABLE CObject_2 : > public CComObjectRootEx<CComSingleThreadModel>, > public CComCoClass<CObject_2, &CLSID_Object_2>, > public IDispatchImpl<IObject_2, &IID_IObject_2, &LIBID_ICFILELib> > { > DECLARE_NO_REGISTRY() > DECLARE_NOT_AGGREGATABLE(CObject_2) > DECLARE_PROTECT_FINAL_CONSTRUCT() > BEGIN_COM_MAP(CObject_2) > COM_INTERFACE_ENTRY(IObject_2) > COM_INTERFACE_ENTRY(IDispatch) > END_COM_MAP() > }; > CObject_1 has the same skeleton > Any one can help? > Thanks a los in advance > Jaime
Fri, 20 Aug 2004 17:47:40 GMT

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