OBJECT3.H

/* 
 * OBJECT3.H 
 * 
 * Definition of the CObject1 class that uses mutliple 
 * inheritance to provide ISampleOne and ISampleTwo. 
 * 
 * Copyright (c)1993-1995 Microsoft Corporation, All Rights Reserved 
 * 
 * Kraig Brockschmidt, Microsoft 
 * Internet  :  kraigb@microsoft.com 
 * Compuserve:  >INTERNET:kraigb@microsoft.com 
 */ 
 
 
#ifndef _OBJECT3_H_ 
#define _OBJECT3_H_ 
 
 
//Creation function 
BOOL CreateObject3(IUnknown **); 
 
 
/* 
 * The object we want to provide in OLE supports the IUnknown, 
 * ISampleOne, and ISampleTwo interfaces. 
 * 
 * The C++ class, CObject3, implements these interfaces through 
 * multiple inheritance, so the implementation of all IUnknown 
 * members is shared.  The trick to this implementation is that 
 * we have to use explicit typecasts in the implementation of 
 * QueryInterface in order to create the right vtables for each 
 * interface.  See OBJECT3.CPP. 
 */ 
 
//The C++ class that manages the actual object. 
class CObject3 : public ISampleOne, public ISampleTwo 
    { 
    private: 
        DWORD           m_cRef;         //Object reference count 
 
    public: 
        CObject3(void); 
        ~CObject3(void); 
 
        //Shared IUnknown members 
        STDMETHODIMP         QueryInterface(REFIID, PPVOID); 
        STDMETHODIMP_(DWORD) AddRef(void); 
        STDMETHODIMP_(DWORD) Release(void); 
 
        //ISampleOne members 
        STDMETHODIMP         GetMessage(LPTSTR, UINT); 
 
        //ISampleTwo members 
        STDMETHODIMP         GetString(LPTSTR, UINT); 
    }; 
 
typedef CObject3 *PCObject3; 
 
#endif _OBJECT3_H_