enumlist.h

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typedef struct tagGUIDStruct
{
    BYTE dummy; /* offset 01 is unknown */
    GUID guid;  /* offset 02 */
} GUIDStruct;

#define PT_GUID 0x1F

typedef struct tagPIDLDATA
{
    BYTE type;          /*00*/
    union
    {
        struct tagGUIDStruct guid;
        struct tagVALUEStruct value;
    } u;
} PIDLDATA, *LPPIDLDATA;

typedef struct tagENUMLIST
{
    struct tagENUMLIST *pNext;
    LPITEMIDLIST pidl;
} ENUMLIST, *LPENUMLIST;

class CEnumIDList:
    public IEnumIDList
{
    public:
        CEnumIDList();
        BOOL AddToEnumList(LPITEMIDLIST pidl);
        
        // IUnknown
        virtual HRESULT WINAPI QueryInterface(REFIID riid, LPVOID *ppvOut);
        virtual ULONG WINAPI AddRef();
        virtual ULONG WINAPI Release();
        
        // IEnumIDList
        virtual HRESULT STDMETHODCALLTYPE Next(ULONG celt, LPITEMIDLIST *rgelt, ULONG *pceltFetched);
        virtual HRESULT STDMETHODCALLTYPE Skip(ULONG celt);
        virtual HRESULT STDMETHODCALLTYPE Reset();
        virtual HRESULT STDMETHODCALLTYPE Clone(IEnumIDList **ppenum);
    
    private:
        LONG        ref;
        LPENUMLIST  mpFirst;
        LPENUMLIST  mpLast;
        LPENUMLIST  mpCurrent;
};