126 lines
3.8 KiB
C
126 lines
3.8 KiB
C
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//--vsof.h---------------------------------------------------------------------
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//
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// Virtual Stream On File interface header file.
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//
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//
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// Copyright (C) Microsoft Corp., 1986-1996. All Rights Reserved.
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//
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//-----------------------------------------------------------------------------
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#ifndef __VSOF_H__
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#pragma option push -b -a8 -pc -A- /*P_O_Push*/
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#define __VSOF_H__
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/* VirtualStreamOnFile (VSOF) */
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/*
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* Methods and #define's for implementing an OLE 2.0 storage stream
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* (as defined in the OLE 2.0 specs) on top of a system file.
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*/
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#ifdef __cplusplus
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extern "C" {
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#endif
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// Flags unique to VSOF IStream implementation
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#define VSOF_CLONEABLE ((ULONG) 0x40000000) // allow stream to be cloned
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#define VSOF_UNIQUEFILENAME ((ULONG) 0x80000000) // Want unique temporary file name
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//$--HrOpenVirtualStreamOnFile---------------------------------------------------
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//
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// DESCRIPTION: Opens a virtual (buffered) stream on a file.
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//
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// INPUT: lpAllocateBuffer -- allocate routine
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// lpFreeBuffer -- de-allocation routine
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// ulFlags -- IStream interface flags--see notes
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// lpszFileName -- file name with complete path
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// lpszPrefix -- file name prefix
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//
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//
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// OUTPUT: lppStream -- stream pointer
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//
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// RETURNS: HRESULT -- NOERROR if successful,
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// E_INVALIDARG if bad input,
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// E_FAIL otherwise.
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//
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// ulFlag notes:
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//
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// Specifying STGM_DELETEONRELEASE makes the file opened a temporary file (It
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// will be deleted when the stream is released).
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//
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// Specifying STGM_SHARE_EXCLUSIVE makes the file accessible by only one application
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// at a time.
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//
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// Specifying STGM_SHARE_DENY_READ makes the file readable by only one application
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// at a time.
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//
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// Specifying STGM_SHARE_DENY_WRITE makes the file writable by only one application
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// at a time.
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//
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// Failing to specify a STGM_SHARE flag makes the file readable and writable
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// by mutliple applications at the same time.
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//
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//-----------------------------------------------------------------------------
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STDMETHODIMP HrOpenVirtualStreamOnFile(
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IN LPALLOCATEBUFFER lpAllocateBuffer, // allocation routine
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IN LPFREEBUFFER lpFreeBuffer, // de-allocation routine
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IN ULONG ulFlags, // stream interface flags
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IN LPSTR lpszFileName, // file name
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IN LPSTR lpszPrefix, // file name prefix
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OUT LPSTREAM FAR * lppStream); // pointer to stream
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typedef HRESULT (STDMETHODCALLTYPE FAR * LPOPENVIRTUALSTREAMONFILE)
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(
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LPALLOCATEBUFFER lpAllocateBuffer,
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LPFREEBUFFER lpFreeBuffer,
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ULONG ulFlags,
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LPSTR lpszFileName,
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LPSTR lpszPrefix,
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LPSTREAM FAR * lppStream
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);
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// Special virtual stream interface extensions for performance...
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// There are certain situations where knowing if the stream has changed can be
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// used to make desicions that will improve performance.
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//$--VSOF_SetClean-------------------------------------------------------------
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//
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// DESCRIPTION: Unsets stream dirty flag
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//
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// INPUT: lpStream -- stream pointer
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//
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// RETURNS: HRESULT -- NOERROF if successful,
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// E_INVALIDARG if bad input.
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//
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//-----------------------------------------------------------------------------
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HRESULT VSOF_SetClean(
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IN LPSTREAM lpStream); // stream pointer
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//$--VSOF_IsDirty-------------------------------------------------------------
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//
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// DESCRIPTION: Returns stream dirty flag
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//
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// INPUT: lpStream -- stream pointer
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//
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// RETURNS: HRESULT -- NOERROF if successful,
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// E_INVALIDARG if bad input.
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//
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//-----------------------------------------------------------------------------
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HRESULT VSOF_IsDirty(
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IN LPSTREAM lpStream, // stream pointer
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OUT BOOL * pfDirty); // dirty flag pointer
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#ifdef WIN32
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#define OPENVIRTUALSTREAMONFILE "HrOpenVirtualStreamOnFile"
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#endif
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#ifdef WIN16
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#define OPENVIRTUALSTREAMONFILE "_OPENVIRTUALSTREAMONFILE"
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#endif
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#ifdef __cplusplus
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}
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#endif
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#pragma option pop /*P_O_Pop*/
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#endif //__VSOF_H__
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