68 lines
1.8 KiB
C
68 lines
1.8 KiB
C
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//====================================================================
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//
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// File:
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// pstg_ca.h
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//
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// Purpose:
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// This file provides macros and prototypes for
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// the IPropertyStorage [call_as] helper functions.
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//
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//====================================================================
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#ifndef _PRSTG_CA_H_
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#define _PRSTG_CA_H_
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// --------
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// Includes
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// --------
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#include "ipropidl.h"
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// ------
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// Macros
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// ------
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// These macros are used to access BSTRs. BSTRs
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// are unicode strings which are preceded with a DWORD
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// of the byte-count. The strings are terminated with a NULL,
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// but the byte-count doesn't include it. A pointer to
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// a BSTR is a pointer to the first character, not to the
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// length DWORD.
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// Given a pointer to a BSTR buffer (i.e., a pointer to the
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// length DWORD) return a BSTR (i.e., a pointer to the first
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// character).
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#define SYSSTRINGOFBUF(buffer) ( (BSTR) ( (ULONG*)(buffer) + 1 ) )
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// Given a BSTR, return a pointer to the buffer (i.e., a pointer to
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// the length DWORD).
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#define SYSSTRINGBUF(bstr) ( (ULONG*)(bstr) - 1 )
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// Given a BSTR, return the character-count, not including the
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// NULL terminator.
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#define SYSSTRINGLEN(bstr) ( *SYSSTRINGBUF(bstr) / sizeof(WCHAR) )
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// ----------
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// Prototypes
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// ----------
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#define BSTR_EXISTS 1
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#define NONSIMPLE_EXISTS 2
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ULONG ContainsSpecialProperty( ULONG cElems, const PROPVARIANT rgpropvar[] );
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HRESULT PropVarMarshalBstr( LPPROPVARIANT lppropvar );
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HRESULT PropVarUnmarshalBstr( LPPROPVARIANT lppropvar );
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HRESULT PropVarMarshalBstrVector( LPPROPVARIANT lppropvar );
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HRESULT PropVarUnmarshalBstrVector( LPPROPVARIANT lppropvar );
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HRESULT PropVarMarshal( ULONG cElems, PROPVARIANT rgpropvar[] );
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HRESULT PropVarUnmarshal( ULONG cVariants, PROPVARIANT rgpropvarOriginal[]);
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#endif // !_PRSTG_CA_H_
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