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#ifndef _APNDATAOBJECT_HXX_
#define _APNDATAOBJECT_HXX_

#include <systools/win32/comtools.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 );
	virtual ~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
