IDATAOBJ.CPP
/*
* IDATAOBJ.CPP
* Data Object Chapter 10
*
* Implementation of the IDataObject interface for CDataObject.
*
* Copyright (c)1993-1995 Microsoft Corporation, All Rights Reserved
*
* Kraig Brockschmidt, Microsoft
* Internet : kraigb@microsoft.com
* Compuserve: >INTERNET:kraigb@microsoft.com
*/
#include "dataobj.h"
/*
* CImpIDataObject::CImpIDataObject
* CImpIDataObject::~CImpIDataObject
*
* Parameters (Constructor):
* pObj PCDataObject of the object we're in.
* pUnkOuter LPUNKNOWN to which we delegate.
*/
CImpIDataObject::CImpIDataObject(PCDataObject pObj
, LPUNKNOWN pUnkOuter)
{
m_cRef=0;
m_pObj=pObj;
m_pUnkOuter=pUnkOuter;
return;
}
CImpIDataObject::~CImpIDataObject(void)
{
return;
}
/*
* CImpIDataObject::QueryInterface
* CImpIDataObject::AddRef
* CImpIDataObject::Release
*
* Purpose:
* IUnknown members for CImpIDataObject object.
*/
STDMETHODIMP CImpIDataObject::QueryInterface(REFIID riid, PPVOID 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.
*
* Return Value:
* HRESULT NOERROR or a general error value.
*/
STDMETHODIMP CImpIDataObject::GetData(LPFORMATETC pFE
, LPSTGMEDIUM pSTM)
{
UINT cf=pFE->cfFormat;
//Check the aspects we support.
if (!(DVASPECT_CONTENT & pFE->dwAspect))
return ResultFromScode(DATA_E_FORMATETC);
switch (cf)
{
case CF_METAFILEPICT:
if (!(TYMED_MFPICT & pFE->tymed))
break;
return m_pObj->RenderMetafilePict(pSTM);
case CF_BITMAP:
if (!(TYMED_GDI & pFE->tymed))
break;
return m_pObj->RenderBitmap(pSTM);
case CF_TEXT:
if (!(TYMED_HGLOBAL & pFE->tymed))
break;
return m_pObj->RenderText(pSTM);
default:
break;
}
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.
*
* Return Value:
* HRESULT NOERROR or a general error value.
*/
STDMETHODIMP CImpIDataObject::GetDataHere(LPFORMATETC pFE
, LPSTGMEDIUM pSTM)
{
return ResultFromScode(E_NOTIMPL);
}
/*
* 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.
*
* Return Value:
* HRESULT NOERROR or a general error value.
*/
STDMETHODIMP CImpIDataObject::QueryGetData(LPFORMATETC pFE)
{
UINT cf=pFE->cfFormat;
BOOL fRet=FALSE;
//Check the aspects we support.
if (!(DVASPECT_CONTENT & pFE->dwAspect))
return ResultFromScode(DATA_E_FORMATETC);
switch (cf)
{
case CF_METAFILEPICT:
fRet=(BOOL)(pFE->tymed & TYMED_MFPICT);
break;
case CF_BITMAP:
fRet=(BOOL)(pFE->tymed & TYMED_GDI);
break;
case CF_TEXT:
fRet=(BOOL)(pFE->tymed & TYMED_HGLOBAL);
break;
default:
fRet=FALSE;
break;
}
return fRet ? NOERROR : 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.
*
* Return Value:
* HRESULT NOERROR or a general error value.
*/
STDMETHODIMP CImpIDataObject::GetCanonicalFormatEtc
(LPFORMATETC pFEIn, LPFORMATETC pFEOut)
{
if (NULL==pFEOut)
return ResultFromScode(E_INVALIDARG);
pFEOut->ptd=NULL;
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.
*
* Return Value:
* HRESULT NOERROR or a general error value.
*/
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.
*
* Return Value:
* HRESULT NOERROR or a general error value.
*/
STDMETHODIMP CImpIDataObject::EnumFormatEtc(DWORD dwDir
, LPENUMFORMATETC *ppEnum)
{
switch (dwDir)
{
case DATADIR_GET:
*ppEnum=new CEnumFormatEtc(m_pObj->m_cfeGet
, m_pObj->m_rgfeGet);
break;
case DATADIR_SET:
*ppEnum=NULL;
break;
default:
*ppEnum=NULL;
break;
}
if (NULL==*ppEnum)
return ResultFromScode(E_FAIL);
else
(*ppEnum)->AddRef();
return NOERROR;
}
/*
* 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.
*
* Return Value:
* HRESULT NOERROR or a general error value.
*/
STDMETHODIMP CImpIDataObject::DAdvise(LPFORMATETC pFE, DWORD dwFlags
, LPADVISESINK pIAdviseSink, LPDWORD pdwConn)
{
HRESULT hr;
if (NULL==m_pObj->m_pIDataAdviseHolder)
{
hr=CreateDataAdviseHolder(&m_pObj->m_pIDataAdviseHolder);
if (FAILED(hr))
return ResultFromScode(E_OUTOFMEMORY);
}
hr=m_pObj->m_pIDataAdviseHolder->Advise((LPDATAOBJECT)this, pFE
, dwFlags, pIAdviseSink, pdwConn);
return hr;
}
/*
* CImpIDataObject::DUnadvise
*
* Purpose:
* Turns off advising previously set up with Advise.
*
* Parameters:
* dwConn DWORD connection key returned from Advise.
*
* Return Value:
* HRESULT NOERROR or a general error value.
*/
STDMETHODIMP CImpIDataObject::DUnadvise(DWORD dwConn)
{
HRESULT hr;
if (NULL==m_pObj->m_pIDataAdviseHolder)
return ResultFromScode(E_FAIL);
hr=m_pObj->m_pIDataAdviseHolder->Unadvise(dwConn);
return hr;
}
/*
* 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.
*
* Return Value:
* HRESULT NOERROR or a general error value.
*/
STDMETHODIMP CImpIDataObject::EnumDAdvise(LPENUMSTATDATA *ppEnum)
{
HRESULT hr;
if (NULL==m_pObj->m_pIDataAdviseHolder)
return ResultFromScode(E_FAIL);
hr=m_pObj->m_pIDataAdviseHolder->EnumAdvise(ppEnum);
return hr;
}