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idataobj.cpp
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C/C++ Source or Header
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1995-05-03
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6KB
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277 lines
/*
* IDATAOBJ.CPP
*
* Template IDataObject interface implementation.
*
* Copyright (c)1993-1995 Microsoft Corporation, All Rights Reserved
*
* Kraig Brockschmidt, Microsoft
* Internet : kraigb@microsoft.com
* Compuserve: >INTERNET:kraigb@microsoft.com
*/
#include "idataobj.h"
/*
* CImpIDataObject::CImpIDataObject
* CImpIDataObject::~CImpIDataObject
*
* Parameters (Constructor):
* pObj LPVOID of the object we're in.
* pUnkOuter LPUNKNOWN to which we delegate.
*/
CImpIDataObject::CImpIDataObject(LPVOID pObj, LPUNKNOWN pUnkOuter)
{
m_cRef=0;
m_pObj=pObj;
m_pUnkOuter=pUnkOuter;
return;
}
CImpIDataObject::~CImpIDataObject(void)
{
return;
}
/*
* CImpIDataObject::QueryInterface
* CImpIDataObject::AddRef
* CImpIDataObject::Release
*
* Purpose:
* Delegating IUnknown members for CImpIDataObject.
*/
STDMETHODIMP CImpIDataObject::QueryInterface(REFIID riid
, LPVOID *ppv)
{
return m_pUnkOuter->QueryInterface(riid, ppv);
}
STDMETHODIMP_(ULONG) CImpIDataObject::AddRef(void)
{
++m_cRef;
return m_pUnkOuter->AddRef();
}
STDMETHODIMP_(ULONG) CImpIDataObject::Release(void)
{
--m_cRef;
return m_pUnkOuter->Release();
}
/*
* CImpIDataObject::GetData
*
* Purpose:
* Retrieves data described by a specific FormatEtc into a StgMedium
* allocated by this function. Used like GetClipboardData.
*
* Parameters:
* pFE LPFORMATETC describing the desired data.
* pSTM LPSTGMEDIUM in which to return the data.
*/
STDMETHODIMP CImpIDataObject::GetData(LPFORMATETC pFE
, LPSTGMEDIUM pSTM)
{
return ResultFromScode(DATA_E_FORMATETC);
}
/*
* CImpIDataObject::GetDataHere
*
* Purpose:
* Renders the specific FormatEtc into caller-allocated medium
* provided in pSTM.
*
* Parameters:
* pFE LPFORMATETC describing the desired data.
* pSTM LPSTGMEDIUM providing the medium into which
* wer render the data.
*/
STDMETHODIMP CImpIDataObject::GetDataHere(LPFORMATETC pFE
, LPSTGMEDIUM pSTM)
{
return ResultFromScode(DATA_E_FORMATETC);
}
/*
* CImpIDataObject::QueryGetData
*
* Purpose:
* Tests if a call to GetData with this FormatEtc will provide
* any rendering; used like IsClipboardFormatAvailable.
*
* Parameters:
* pFE LPFORMATETC describing the desired data.
*/
STDMETHODIMP CImpIDataObject::QueryGetData(LPFORMATETC pFE)
{
return ResultFromScode(S_FALSE);
}
/*
* CImpIDataObject::GetCanonicalFormatEtc
*
* Purpose:
* Provides the caller with an equivalent FormatEtc to the one
* provided when different FormatEtcs will produce exactly the
* same renderings.
*
* Parameters:
* pFEIn LPFORMATETC of the first description.
* pFEOut LPFORMATETC of the equal description.
*/
STDMETHODIMP CImpIDataObject::GetCanonicalFormatEtc(LPFORMATETC pFEIn
, LPFORMATETC pFEOut)
{
return ResultFromScode(DATA_S_SAMEFORMATETC);
}
/*
* CImpIDataObject::SetData
*
* Purpose:
* Places data described by a FormatEtc and living in a StgMedium
* into the object. The object may be responsible to clean up the
* StgMedium before exiting.
*
* Parameters:
* pFE LPFORMATETC describing the data to set.
* pSTM LPSTGMEDIUM containing the data.
* fRelease BOOL indicating if this function is responsible
* for freeing the data.
*/
STDMETHODIMP CImpIDataObject::SetData(LPFORMATETC pFE
, LPSTGMEDIUM pSTM, BOOL fRelease)
{
return ResultFromScode(DATA_E_FORMATETC);
}
/*
* CImpIDataObject::EnumFormatEtc
*
* Purpose:
* Returns an IEnumFORMATETC object through which the caller can
* iterate to learn about all the data formats this object can
* provide through either GetData[Here] or SetData.
*
* Parameters:
* dwDir DWORD describing a data direction, either
* DATADIR_SET or DATADIR_GET.
* ppEnum LPENUMFORMATETC * in which to return the
* pointer to the enumerator.
*/
STDMETHODIMP CImpIDataObject::EnumFormatEtc(DWORD dwDir
, LPENUMFORMATETC *ppEnum)
{
return ResultFromScode(E_FAIL);
}
/*
* CImpIDataObject::DAdvise
*
* Purpose:
* Provides the data object with an IAdviseSink object that we are
* responsible to notify when the data changes.
*
* Parameters:
* ppFE LPFORMATETC
* dwFlags DWORD carrying flags indicating how the advise
* sink wants to be treated.
* pIAdviseSink LPADVISESINK to the object to notify
* pdwConn LPDWORD into which we store a DWORD key
* identifying the advise connection.
*/
STDMETHODIMP CImpIDataObject::DAdvise(LPFORMATETC pFE, DWORD dwFlags
, LPADVISESINK pIAdviseSink, LPDWORD pdwConn)
{
return ResultFromScode(E_OUTOFMEMORY);
}
/*
* CImpIDataObject::DUnadvise
*
* Purpose:
* Turns off advising previously set up with Advise.
*
* Parameters:
* dwConn DWORD connection key returned from Advise.
*/
STDMETHODIMP CImpIDataObject::DUnadvise(DWORD dwConn)
{
return ResultFromScode(E_FAIL);
}
/*
* CImpIDataObject::EnumDAdvise
*
* Purpose:
* Returns an enumerator object through which the caller can find
* all the agents currently receiving advises on this data object.
*
* Parameters:
* ppEnum LPENUMSTATDATA * in which to return the
* enumerator.
*/
STDMETHODIMP CImpIDataObject::EnumDAdvise(LPENUMSTATDATA *ppEnum)
{
return ResultFromScode(E_FAIL);
}