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typedef struct tagSTGMEDIUM 

{ 

    DWORD tymed; 

    [switch_type(DWORD), switch_is((DWORD) tymed)] 

    union { 

        [case(TYMED_GDI)]      HBITMAP        hBitmap; 

        [case(TYMED_MFPICT)]   HMETAFILEPICT  hMetafilePict; 

        [case(TYMED_ENHMF)]    HENHMETAFILE   hEnhMetaFile; 

        [case(TYMED_HGLOBAL)]  HGLOBAL        hGlobal; 

        [case(TYMED_FILE)]     LPWSTR         lpszFileName; 



        [case(TYMED_ISTREAM)]  IStream        *pstm; 

        [case(TYMED_ISTORAGE)] IStorage       *pstg; 

        [default] ; 

    }; 

    [unique] IUnknown *pUnkForRelease; 

}STGMEDIUM; 

typedef STGMEDIUM *LPSTGMEDIUM;