DATAOBJ.H

/* 
 * DATAOBJ.H 
 * Data Transfer Object Chapter 12 
 * 
 * Copyright (c)1993-1995 Microsoft Corporation, All Right Reserved 
 * 
 * Kraig Brockschmidt, Microsoft 
 * Internet  :  kraigb@microsoft.com 
 * Compuserve:  >INTERNET:kraigb@microsoft.com 
 */ 
 
 
#ifndef _DATAOBJ_H_ 
#define _DATAOBJ_H_ 
 
 
#define INC_OLE2 
#define CHAPTER12 
#include <inole.h> 
 
 
/* 
 * Structure to describe a specific rendering that our user wants 
 * us to maintain. 
 */ 
 
typedef struct tagRENDERING 
    { 
    FORMATETC       fe;             //The format 
    STGMEDIUM       stm;            //The actual data 
    LPUNKNOWN       pUnkOrg;        //The real owner 
    } RENDERING, *PRENDERING; 
 
 
 
/* 
 * The DataObject object is implemented in its own class with its 
 * own IUnknown to support aggregation.  It contains one 
 * CImpIDataObject object that we use to implement the externally 
 * exposed interfaces. 
 */ 
 
//DATAOBJ.CPP 
 
class CImpIDataObject; 
typedef class CImpIDataObject *PIMPIDATAOBJECT; 
 
class CDataObject : public IUnknown 
    { 
    friend class CImpIDataObject; 
 
    protected: 
        ULONG               m_cRef; 
        LPUNKNOWN           m_pUnkOuter; 
        PFNDESTROYED        m_pfnDestroy; 
 
        HWND                m_hList;        //Listbox of RENDERINGs 
 
        //Contained interface implemetation 
        PIMPIDATAOBJECT     m_pIDataObject; 
 
    public: 
        CDataObject(LPUNKNOWN, PFNDESTROYED); 
        ~CDataObject(void); 
 
        BOOL Init(void); 
        void Purge(void); 
 
        //Non-delegating object IUnknown 
        STDMETHODIMP         QueryInterface(REFIID, PPVOID); 
        STDMETHODIMP_(ULONG) AddRef(void); 
        STDMETHODIMP_(ULONG) Release(void); 
    }; 
 
typedef CDataObject *PCDataObject; 
 
 
 
/* 
 * Interface implementations for the CDataObject object. 
 */ 
 
class CImpIDataObject : public IDataObject 
    { 
    private: 
        ULONG           m_cRef; 
        PCDataObject    m_pObj; 
        LPUNKNOWN       m_pUnkOuter; 
 
    public: 
        CImpIDataObject(PCDataObject, LPUNKNOWN); 
        ~CImpIDataObject(void); 
 
        //IUnknown members that delegate to m_pUnkOuter. 
        STDMETHODIMP         QueryInterface(REFIID, PPVOID); 
        STDMETHODIMP_(ULONG) AddRef(void); 
        STDMETHODIMP_(ULONG) Release(void); 
 
        //IDataObject members 
        STDMETHODIMP GetData(LPFORMATETC, LPSTGMEDIUM); 
        STDMETHODIMP GetDataHere(LPFORMATETC, LPSTGMEDIUM); 
        STDMETHODIMP QueryGetData(LPFORMATETC); 
        STDMETHODIMP GetCanonicalFormatEtc(LPFORMATETC, LPFORMATETC); 
        STDMETHODIMP SetData(LPFORMATETC, LPSTGMEDIUM, BOOL); 
        STDMETHODIMP EnumFormatEtc(DWORD, LPENUMFORMATETC *); 
        STDMETHODIMP DAdvise(LPFORMATETC, DWORD 
            ,  LPADVISESINK, DWORD *); 
        STDMETHODIMP DUnadvise(DWORD); 
        STDMETHODIMP EnumDAdvise(LPENUMSTATDATA *); 
    }; 
 
 
class CEnumFormatEtc : public IEnumFORMATETC 
    { 
    private: 
        ULONG           m_cRef; 
        LPUNKNOWN       m_pUnkRef; 
        LPFORMATETC     m_prgfe; 
        ULONG           m_iCur; 
        ULONG           m_cItems; 
 
    public: 
        CEnumFormatEtc(LPUNKNOWN); 
        ~CEnumFormatEtc(void); 
 
        BOOL Init(HWND); 
 
        //IUnknown members that delegate to m_pUnkOuter. 
        STDMETHODIMP         QueryInterface(REFIID, PPVOID); 
        STDMETHODIMP_(ULONG) AddRef(void); 
        STDMETHODIMP_(ULONG) Release(void); 
 
        //IEnumFORMATETC members 
        STDMETHODIMP Next(ULONG, LPFORMATETC, ULONG *); 
        STDMETHODIMP Skip(ULONG); 
        STDMETHODIMP Reset(void); 
        STDMETHODIMP Clone(IEnumFORMATETC **); 
    }; 
 
 
typedef CEnumFormatEtc *PCEnumFormatEtc; 
 
#endif //_DATAOBJ_H_