82 lines
1.9 KiB
C++
82 lines
1.9 KiB
C++
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//+---------------------------------------------------------------------------
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//
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// Microsoft Windows
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// Copyright (C) Microsoft Corporation, 1992 - 1993.
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//
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// File: ofsenm.hxx
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//
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// Contents: File storage enumerator
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//
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// Classes: COfsFileEnum
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//
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// History: 21-Jul-93 DrewB Created
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//
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//----------------------------------------------------------------------------
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#ifndef __OFSENM_HXX__
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#define __OFSENM_HXX__
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//+---------------------------------------------------------------------------
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//
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// Class: COfsFileEnum (fe)
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//
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// Purpose: File storage enumerator
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//
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// Interface: IEnumSTATSTG
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//
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// History: 21-Jul-93 DrewB Created
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//
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//----------------------------------------------------------------------------
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class COfsFileEnum
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: INHERIT_TRACKING,
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public IEnumSTATSTG
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{
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public:
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COfsFileEnum(void);
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SCODE InitFromHandle(HANDLE h, BOOL fDone);
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~COfsFileEnum(void);
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// IUnknown
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STDMETHOD(QueryInterface)(REFIID iid, void **ppvObj);
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DECLARE_STD_REFCOUNTING;
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// IEnumSTATSTG
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STDMETHOD(Next)(ULONG celt, STATSTG FAR *rgelt, ULONG *pceltFetched);
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STDMETHOD(Skip)(ULONG celt);
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STDMETHOD(Reset)(void);
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STDMETHOD(Clone)(IEnumSTATSTG **ppenm);
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private:
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inline SCODE Validate(void) const;
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ULONG _sig;
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NuSafeNtHandle _h;
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BOOL _fDone;
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};
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SAFE_INTERFACE_PTR(SafeCOfsFileEnum, COfsFileEnum);
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#define COFSFILEENUM_SIG LONGSIG('O', 'F', 'N', 'M')
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#define COFSFILEENUM_SIGDEL LONGSIG('O', 'f', 'N', 'm')
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//+--------------------------------------------------------------
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//
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// Member: COfsFileEnum::Validate, private
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//
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// Synopsis: Validates the class signature
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//
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// Returns: Returns STG_E_INVALIDHANDLE for failure
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//
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// History: 21-Jul-93 DrewB Created
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//
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//---------------------------------------------------------------
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inline SCODE COfsFileEnum::Validate(void) const
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{
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return (this == NULL || _sig != COFSFILEENUM_SIG) ?
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STG_E_INVALIDHANDLE : S_OK;
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}
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#endif // #ifndef __FSENM_HXX__
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