home *** CD-ROM | disk | FTP | other *** search
- /*+==========================================================================
- File: UTILCAR.H
-
- Summary: Include file for the aggregatable COUtilityCar COM object class.
-
- UTILCAR showcases the construction of the COUtilityCar COM
- object class with the IUnknown, ICar, and IUtility interfaces.
- This is done through Containment reuse of COCar's ICar
- interface features.
-
- This multiple interface COM Object Class is achieved via
- the technique of nested classes: the implementation of the
- ICar and IUtility interfaces are nested inside of the
- COUtilityCar COM object class.
-
- For a comprehensive tutorial code tour of this module's
- contents and offerings see the tutorial DLLSERVE.HTM file.
- For more specific technical details on the internal workings
- see the comments dispersed throughout the module's source code.
-
- Classes: COUtilityCar
-
- Functions: .
-
- Origin: 9-11-95: atrent - Editor-inheritance from UTILCAR.H in
- the COMOBJ Tutorial Code Sample.
-
- ----------------------------------------------------------------------------
- This file is part of the Microsoft COM Tutorial Code Samples.
-
- Copyright (C) Microsoft Corporation, 1997. All rights reserved.
-
- This source code is intended only as a supplement to Microsoft
- Development Tools and/or on-line documentation. See these other
- materials for detailed information regarding Microsoft code samples.
-
- THIS CODE AND INFORMATION IS PROVIDED "AS IS" WITHOUT WARRANTY OF ANY
- KIND, EITHER EXPRESSED OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE
- IMPLIED WARRANTIES OF MERCHANTABILITY AND/OR FITNESS FOR A
- PARTICULAR PURPOSE.
- ==========================================================================+*/
-
- #if !defined(UTILCAR_H)
- #define UTILCAR_H
-
- #ifdef __cplusplus
-
- /*O+O+++O+++O+++O+++O+++O+++O+++O+++O+++O+++O+++O+++O+++O+++O+++O+++O+++O+++O
- ObjectClass: COUtilityCar
-
- Summary: COM Object Class for COUtilityCar COM Objects. COM objects
- of this class augment COCar COM objects (which offer ICar
- interface features of Shift, Clutch, Speed, and Steer) with
- IUtility interface features (Offroad and Winch). This
- COUtilityCar COM object class is constructed by containment
- reuse of the COCar COM object class. The mulitple
- interfaces on this COM object class are constructed via
- the nested interface classes technique.
-
- Interfaces: IUnknown
- Standard interface providing COM object features.
- ICar
- Basic Car operation features.
- IUtility
- Sport-utility vehicle offroad features.
-
- Aggregation: Yes, COUtilityCar COM objects are aggregatable by passing
- a non-NULL pUnkOuter IUnknown pointer into the constructor.
- O---O---O---O---O---O---O---O---O---O---O---O---O---O---O---O---O---O---O-O*/
- class COUtilityCar : public IUnknown
- {
- public:
- // Main Object Constructor & Destructor.
- COUtilityCar(IUnknown* pUnkOuter, CServer* pServer);
- ~COUtilityCar(void);
-
- // A general method for initializing a newly created COUtilityCar.
- HRESULT Init(void);
-
- // IUnknown methods. Main object, non-delegating.
- STDMETHODIMP QueryInterface(REFIID, PPVOID);
- STDMETHODIMP_(ULONG) AddRef(void);
- STDMETHODIMP_(ULONG) Release(void);
-
- // We get this ICar interface pointer via containment reuse of the
- // ICar interface in an instantiated COCar.
- ICar* m_pICar;
-
- private:
- // We show nested interface class implementations here.
-
- // We implement the basic ICar interface in this COUtilityCar
- // COM object class.
- class CImpICar : public ICar
- {
- public:
- // Interface Implementation Constructor & Destructor.
- CImpICar(COUtilityCar* pBackObj, IUnknown* pUnkOuter);
- ~CImpICar(void);
-
- // IUnknown methods.
- STDMETHODIMP QueryInterface(REFIID, PPVOID);
- STDMETHODIMP_(ULONG) AddRef(void);
- STDMETHODIMP_(ULONG) Release(void);
-
- // ICar methods.
- STDMETHODIMP Shift(short nGear);
- STDMETHODIMP Clutch(short nEngaged);
- STDMETHODIMP Speed(short nMph);
- STDMETHODIMP Steer(short nAngle);
-
- private:
- // Data private to this COUtilityCar interface implementation of ICar.
- ULONG m_cRefI; // Interface Ref Count (for debugging).
- COUtilityCar* m_pBackObj; // Parent Object back pointer.
- IUnknown* m_pUnkOuter; // Outer unknown for Delegation.
- };
-
- // We implement the IUtility interface (ofcourse) in this COUtilityCar
- // COM object class. This is the interface that we are using as an
- // augmentation to the existing COCar COM object class.
- class CImpIUtility : public IUtility
- {
- public:
- // Interface Implementation Constructor & Destructor.
- CImpIUtility(COUtilityCar* pBackObj, IUnknown* pUnkOuter);
- ~CImpIUtility(void);
-
- // IUnknown methods.
- STDMETHODIMP QueryInterface(REFIID, PPVOID);
- STDMETHODIMP_(ULONG) AddRef(void);
- STDMETHODIMP_(ULONG) Release(void);
-
- // IUtility methods.
- STDMETHODIMP Offroad(short nGear);
- STDMETHODIMP Winch(short nRpm);
-
- private:
- // Data private to this interface implementation of IUtility.
- ULONG m_cRefI; // Interface Ref Count (for debugging).
- COUtilityCar* m_pBackObj; // Parent Object back pointer.
- IUnknown* m_pUnkOuter; // Outer unknown for Delegation.
- };
-
- // Make the otherwise private and nested ICar interface implementation
- // a friend to COM object instantiations of this selfsame COUtilityCar
- // COM object class.
- friend CImpICar;
- friend CImpIUtility;
-
- // Private data of COUtilityCar COM objects.
-
- // Nested ICar implementation instantiation.
- CImpICar m_ImpICar;
-
- // Nested IUtility implementation instantiation.
- CImpIUtility m_ImpIUtility;
-
- // Main Object reference count.
- ULONG m_cRefs;
-
- // Outer unknown (aggregation & delegation).
- IUnknown* m_pUnkOuter;
-
- // Pointer to this component server's control object.
- CServer* m_pServer;
- };
-
- typedef COUtilityCar* PCOUtilityCar;
-
- #endif // __cplusplus
-
-
- #endif // UTILCAR_H
-