76 lines
2.4 KiB
C
76 lines
2.4 KiB
C
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//==========================================================================
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//
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// THIS CODE AND INFORMATION IS PROVIDED "AS IS" WITHOUT WARRANTY OF ANY
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// KIND, EITHER EXPRESSED OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE
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// IMPLIED WARRANTIES OF MERCHANTABILITY AND/OR FITNESS FOR A PARTICULAR
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// PURPOSE.
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//
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// Copyright 1998 - 1999 Microsoft Corporation. All Rights Reserved.
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//
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//--------------------------------------------------------------------------
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// header file for handler specific items
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#ifndef _ENUMERATOR_CLASS_
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#define _ENUMERATOR_CLASS_
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// structure for keeping track of items as a whole
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typedef struct _tagGENERICITEM
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{
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DWORD cbSize; // total size of item (this structure + whatever caller needs for data)
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_tagGENERICITEM *pNextGenericItem;
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} GENERICITEM;
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typedef GENERICITEM *LPGENERICITEM;
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typedef struct _tagGENERICITEMLIST
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{
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DWORD _cRefs; // reference count on this structure
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DWORD dwNumItems; // number of items in array.
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LPGENERICITEM pFirstGenericItem; // ptr to first Item in linked list
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} GENERICITEMLIST;
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typedef GENERICITEMLIST *LPGENERICITEMLIST;
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class CGenericEnum
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{
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public:
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DWORD m_cRef;
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DWORD m_cOffset;
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LPGENERICITEMLIST m_pGenericItemList; // array of items
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LPGENERICITEM m_pNextItem;
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public:
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CGenericEnum(LPGENERICITEMLIST pGenericItemList,DWORD cOffset);
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~CGenericEnum();
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virtual void DeleteThisObject() = 0;
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//IUnknown members
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STDMETHODIMP QueryInterface(REFIID, LPVOID FAR *);
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STDMETHODIMP_(ULONG) AddRef();
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STDMETHODIMP_(ULONG) Release();
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STDMETHODIMP Next(ULONG celt,LPGENERICITEM rgelt,ULONG *pceltFetched);
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STDMETHODIMP Clone(CGenericEnum **ppenum);
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STDMETHODIMP Skip(ULONG celt);
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STDMETHODIMP Reset();
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};
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// helper functions for managing list.
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DWORD AddRef_ItemList(LPGENERICITEMLIST pGenericItemList);
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DWORD Release_ItemList(LPGENERICITEMLIST pGenericItemList);
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LPGENERICITEMLIST CreateItemList();
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LPGENERICITEMLIST DuplicateItemList(LPGENERICITEMLIST pItemList);
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LPGENERICITEM AddNewItemToList(LPGENERICITEMLIST lpGenericList,ULONG cbSize);
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BOOL AddItemToList(LPGENERICITEMLIST lpGenericList,LPGENERICITEM pGenericItem);
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BOOL DeleteItemFromList(LPGENERICITEMLIST lpGenericList,LPGENERICITEM pGenericItem);
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LPGENERICITEM CreateNewListItem(ULONG cbSize);
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#endif // #define _ENUMERATOR_CLASS_
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