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//
// DATAOBJECT.CPP
//
// Implementation of the IDataObject COM interface
//
// By J Brown 2004
//
// www.catch22.net
//
//#define STRICT
#include "headers.h"
const ULONG MAX_FORMATS = 100;
HRESULT CreateEnumFormatEtc(UINT nNumFormats, FORMATETC *pFormatEtc, IEnumFORMATETC **ppEnumFormatEtc);
class CDataObject : public IDataObject
{
public:
//
// IUnknown members
//
HRESULT __stdcall QueryInterface (REFIID iid, void ** ppvObject);
ULONG __stdcall AddRef (void);
ULONG __stdcall Release (void);
//
// IDataObject members
//
HRESULT __stdcall GetData (FORMATETC *pFormatEtc, STGMEDIUM *pMedium);
HRESULT __stdcall GetDataHere (FORMATETC *pFormatEtc, STGMEDIUM *pMedium);
HRESULT __stdcall QueryGetData (FORMATETC *pFormatEtc);
HRESULT __stdcall GetCanonicalFormatEtc (FORMATETC *pFormatEct, FORMATETC *pFormatEtcOut);
HRESULT __stdcall SetData (FORMATETC *pFormatEtc, STGMEDIUM *pMedium, BOOL fRelease);
HRESULT __stdcall EnumFormatEtc (DWORD dwDirection, IEnumFORMATETC **ppEnumFormatEtc);
HRESULT __stdcall DAdvise (FORMATETC *pFormatEtc, DWORD advf, IAdviseSink *pAdvSink, DWORD *pdwConnection);
HRESULT __stdcall DUnadvise (DWORD dwConnection);
HRESULT __stdcall EnumDAdvise (IEnumSTATDATA **ppEnumAdvise);
//
// Constructor / Destructor
//
CDataObject(const FORMATETC *fmt, const STGMEDIUM *stgmed, int count);
~CDataObject();
private:
int LookupFormatEtc(FORMATETC *pFormatEtc);
//
// any private members and functions
//
LONG m_lRefCount;
FORMATETC *m_pFormatEtc;
STGMEDIUM *m_pStgMedium;
LONG m_nNumFormats;
};
//
// Constructor
//
CDataObject::CDataObject(const FORMATETC *fmtetc, const STGMEDIUM *stgmed, int count)
{
m_lRefCount = 1;
m_nNumFormats = count;
m_pFormatEtc = new FORMATETC[count];
m_pStgMedium = new STGMEDIUM[count];
for(int i = 0; i < count; i++)
{
m_pFormatEtc[i] = fmtetc[i];
m_pStgMedium[i] = stgmed[i];
}
}
//
// Destructor
//
CDataObject::~CDataObject()
{
// cleanup
for (int i = 0; i < m_nNumFormats; i++)
{
// ReleaseStgMedium(&m_pStgMedium[i]);
}
if(m_pFormatEtc) delete[] m_pFormatEtc;
if(m_pStgMedium) delete[] m_pStgMedium;
}
//
// IUnknown::AddRef
//
ULONG __stdcall CDataObject::AddRef(void)
{
// increment object reference count
return InterlockedIncrement(&m_lRefCount);
}
//
// IUnknown::Release
//
ULONG __stdcall CDataObject::Release(void)
{
// decrement object reference count
LONG count = InterlockedDecrement(&m_lRefCount);
if(count == 0)
{
delete this;
return 0;
}
else
{
return count;
}
}
//
// IUnknown::QueryInterface
//
HRESULT __stdcall CDataObject::QueryInterface(REFIID iid, void **ppvObject)
{
// check to see what interface has been requested
if(iid == IID_IDataObject || iid == IID_IUnknown)
{
AddRef();
*ppvObject = this;
return S_OK;
}
else
{
*ppvObject = 0;
return E_NOINTERFACE;
}
}
int CDataObject::LookupFormatEtc(FORMATETC *pFormatEtc)
{
for (int i = 0; i < m_nNumFormats; i++)
{
if ((pFormatEtc->tymed & m_pFormatEtc[i].tymed) &&
pFormatEtc->cfFormat == m_pFormatEtc[i].cfFormat &&
pFormatEtc->dwAspect == m_pFormatEtc[i].dwAspect)
{
return i;
}
}
return -1;
}
//
// IDataObject::GetData
//
HRESULT __stdcall CDataObject::GetData (FORMATETC *pFormatEtc, STGMEDIUM *pMedium)
{
int idx;
//
// try to match the requested FORMATETC with one of our supported formats
//
if ((idx = LookupFormatEtc(pFormatEtc)) == -1)
{
return DV_E_FORMATETC;
}
//
// found a match! transfer the data into the supplied storage-medium
//
pMedium->tymed = m_pFormatEtc[idx].tymed;
pMedium->pUnkForRelease = 0;
switch (pMedium->tymed)
{
case TYMED_HGLOBAL:
case TYMED_GDI:
case TYMED_ENHMF:
// pMedium->hBitmap = (HBITMAP)OleDuplicateData(m_pStgMedium[idx].hBitmap, pFormatEtc->cfFormat, 0);
pMedium->hBitmap = m_pStgMedium[idx].hBitmap;
break;
default:
return DV_E_FORMATETC;
}
if (pMedium->hBitmap == NULL) return STG_E_MEDIUMFULL;
return S_OK;
}
//
// IDataObject::GetDataHere
//
HRESULT __stdcall CDataObject::GetDataHere (FORMATETC *pFormatEtc, STGMEDIUM *pMedium)
{
// GetDataHere is only required for IStream and IStorage mediums
// It is an error to call GetDataHere for things like HGLOBAL and other clipboard formats
//
// OleFlushClipboard
//
return DATA_E_FORMATETC;
}
//
// IDataObject::QueryGetData
//
// Called to see if the IDataObject supports the specified format of data
//
HRESULT __stdcall CDataObject::QueryGetData (FORMATETC *pFormatEtc)
{
return (LookupFormatEtc(pFormatEtc) == -1) ? DV_E_FORMATETC : S_OK;
}
//
// IDataObject::GetCanonicalFormatEtc
//
HRESULT __stdcall CDataObject::GetCanonicalFormatEtc (FORMATETC *pFormatEct, FORMATETC *pFormatEtcOut)
{
// Apparently we have to set this field to NULL even though we don't do anything else
pFormatEtcOut->ptd = NULL;
return E_NOTIMPL;
}
//
// IDataObject::SetData
//
HRESULT __stdcall CDataObject::SetData (FORMATETC *pFormatEtc, STGMEDIUM *pMedium, BOOL fRelease)
{
return E_NOTIMPL;
}
//
// IDataObject::EnumFormatEtc
//
HRESULT __stdcall CDataObject::EnumFormatEtc (DWORD dwDirection, IEnumFORMATETC **ppEnumFormatEtc)
{
if(dwDirection == DATADIR_GET)
{
// for Win2k+ you can use the SHCreateStdEnumFmtEtc API call, however
// to support all Windows platforms we need to implement IEnumFormatEtc ourselves.
return CreateEnumFormatEtc(m_nNumFormats, m_pFormatEtc, ppEnumFormatEtc);
}
else
{
// the direction specified is not support for drag+drop
return E_NOTIMPL;
}
}
//
// IDataObject::DAdvise
//
HRESULT __stdcall CDataObject::DAdvise (FORMATETC *pFormatEtc, DWORD advf, IAdviseSink *pAdvSink, DWORD *pdwConnection)
{
return OLE_E_ADVISENOTSUPPORTED;
}
//
// IDataObject::DUnadvise
//
HRESULT __stdcall CDataObject::DUnadvise (DWORD dwConnection)
{
return OLE_E_ADVISENOTSUPPORTED;
}
//
// IDataObject::EnumDAdvise
//
HRESULT __stdcall CDataObject::EnumDAdvise (IEnumSTATDATA **ppEnumAdvise)
{
return OLE_E_ADVISENOTSUPPORTED;
}
//
// Helper function
//
HRESULT CreateDataObject (const FORMATETC *fmtetc, const STGMEDIUM *stgmeds, UINT count, IDataObject **ppDataObject)
{
if(ppDataObject == 0)
return E_INVALIDARG;
*ppDataObject = new CDataObject(fmtetc, stgmeds, count);
return (*ppDataObject) ? S_OK : E_OUTOFMEMORY;
}
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