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#ifndef _APNDATAOBJECT_HXX_
#define _APNDATAOBJECT_HXX_

//------------------------------------------------------------------------
// deklarations
//------------------------------------------------------------------------

/*
    an APartment Neutral dataobject wrapper; this wrapper of a IDataObject
    pointer can be used from any apartment without RPC_E_WRONG_THREAD
    which normally occurs if an apartment tries to use an interface
    pointer of another apartment; we use containment to hold the original
    DataObject
*/
class CAPNDataObject : public IDataObject
{
public:
    CAPNDataObject( IDataObjectPtr rIDataObject );
    ~CAPNDataObject( );

    //-----------------------------------------------------------------
    //IUnknown interface methods
    //-----------------------------------------------------------------

    STDMETHODIMP           QueryInterface(REFIID iid, LPVOID* ppvObject);
    STDMETHODIMP_( ULONG ) AddRef( );
    STDMETHODIMP_( ULONG ) Release( );

    //-----------------------------------------------------------------
    // IDataObject interface methods
    //-----------------------------------------------------------------

    STDMETHODIMP GetData( LPFORMATETC pFormatetc, LPSTGMEDIUM pmedium );
    STDMETHODIMP GetDataHere( LPFORMATETC pFormatetc, LPSTGMEDIUM pmedium );
    STDMETHODIMP QueryGetData( LPFORMATETC pFormatetc );
    STDMETHODIMP GetCanonicalFormatEtc( LPFORMATETC pFormatectIn, LPFORMATETC pFormatetcOut );
    STDMETHODIMP SetData( LPFORMATETC pFormatetc, LPSTGMEDIUM pmedium, BOOL fRelease );
    STDMETHODIMP EnumFormatEtc( DWORD dwDirection, IEnumFORMATETC** ppenumFormatetc );
    STDMETHODIMP DAdvise( LPFORMATETC pFormatetc, DWORD advf, LPADVISESINK pAdvSink, DWORD* pdwConnection );
    STDMETHODIMP DUnadvise( DWORD dwConnection );
    STDMETHODIMP EnumDAdvise( LPENUMSTATDATA* ppenumAdvise );

    operator IDataObject*( );

private:
    HRESULT MarshalIDataObjectIntoCurrentApartment( IDataObject** ppIDataObj );

private:
    IDataObjectPtr  m_rIDataObjectOrg;
    HGLOBAL         m_hGlobal;
    LONG            m_nRefCnt;

// prevent copy and assignment
private:
    CAPNDataObject( const CAPNDataObject& theOther );
    CAPNDataObject& operator=( const CAPNDataObject& theOther );
};

#endif

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