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iperstrm.cpp
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C/C++ Source or Header
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1995-05-03
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4KB
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191 lines
/*
* IPERSTRM.CPP
*
* Template IPersistStream interface implementation.
*
* Copyright (c)1993-1995 Microsoft Corporation, All Rights Reserved
*
* Kraig Brockschmidt, Microsoft
* Internet : kraigb@microsoft.com
* Compuserve: >INTERNET:kraigb@microsoft.com
*/
#include "iperstrm.h"
/*
* CImpIPersistStream:CImpIPersistStream
* CImpIPersistStream::~CImpIPersistStream
*
* Constructor Parameters:
* pObj LPVOID pointing to the object we live in.
* pUnkOuter LPUNKNOWN of the controlling unknown.
*/
CImpIPersistStream::CImpIPersistStream(LPVOID pObj
, LPUNKNOWN pUnkOuter)
{
m_cRef=0;
m_pObj=pObj;
m_pUnkOuter=pUnkOuter;
return;
}
CImpIPersistStream::~CImpIPersistStream(void)
{
return;
}
/*
* CImpIPersistStream::QueryInterface
* CImpIPersistStream::AddRef
* CImpIPersistStream::Release
*
* Purpose:
* Delegating IUnknown members for CImpIPersistStream.
*/
STDMETHODIMP CImpIPersistStream::QueryInterface(REFIID riid
, LPVOID *ppv)
{
return m_pUnkOuter->QueryInterface(riid, ppv);
}
STDMETHODIMP_(ULONG) CImpIPersistStream::AddRef(void)
{
++m_cRef;
return m_pUnkOuter->AddRef();
}
STDMETHODIMP_(ULONG) CImpIPersistStream::Release(void)
{
--m_cRef;
return m_pUnkOuter->Release();
}
/*
* CImpIPersistStream::GetClassID
*
* Purpose:
* Returns the CLSID of the object represented by this interface.
*
* Parameters:
* pClsID LPCLSID in which to store our CLSID.
*/
STDMETHODIMP CImpIPersistStream::GetClassID(LPCLSID pClsID)
{
return NOERROR;
}
/*
* CImpIPersistStream::IsDirty
*
* Purpose:
* Tells the caller if we have made changes to this object since
* it was loaded or initialized new.
*
* Parameters:
* None
*
* Return Value:
* HRESULT Contains S_OK if we ARE dirty, S_FALSE if
* NOT dirty.
*/
STDMETHODIMP CImpIPersistStream::IsDirty(void)
{
return ResultFromScode(S_FALSE);
}
/*
* CImpIPersistStream::Load
*
* Purpose:
* Instructs the object to load itself from a previously saved
* IStream that was handled by Save in another object lifetime.
* The seek pointer in this stream will be exactly the same as
* it was when Save was called, and this function must leave
* the seek pointer the same as it was on exit from Save, regardless
* of success or failure. This function should not hold on to
* pIStream.
*
* Parameters:
* pIStream LPSTREAM from which to load.
*/
STDMETHODIMP CImpIPersistStream::Load(LPSTREAM pIStream)
{
return NOERROR;
}
/*
* CImpIPersistStream::Save
*
* Purpose:
* Saves the data for this object to an IStream. Be sure not
* to change the position of the seek pointer on entry to this
* function: the caller will assume that you write from the
* current offset. Leave the stream's seek pointer at the end
* of the data written on exit.
*
* Parameters:
* pIStream LPSTREAM in which to save our data.
* fClearDirty BOOL indicating if this call should clear
* the object's dirty flag (TRUE) or leave it
* unchanged (FALSE).
*/
STDMETHODIMP CImpIPersistStream::Save(LPSTREAM pIStream
, BOOL fClearDirty)
{
return NOERROR;
}
/*
* CImpIPersistStream::GetSizeMax
*
* Purpose:
* Returns the size of the data we would write if Save was
* called right now.
*
* Parameters:
* pcbSize ULARGE_INTEGER * in which to save the size
* of the stream an immediate call to Save would
* write.
*/
STDMETHODIMP CImpIPersistStream::GetSizeMax(ULARGE_INTEGER
*pcbSize)
{
return NOERROR;
}