MIDL & enum

I like to use enum in interface method. What I must do?
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There's nothing special about using enumerations with COM interfaces, e.g.:

typedef enum OSPXFER
} OSPXFER; // <-- !!!

interface OLEDBSimpleProviderListener : IUnknown
      // As noted above; a -1 (STD_IndexAll) can be used in the row or column
      // (or both).  For example, CellChanged(STD_IndexAll, OSP_IndexAll)
      // implies that all rows and columns changed shape.

      HRESULT aboutToChangeCell([in] long iRow, [in] long iColumn);
      HRESULT cellChanged([in] long iRow, [in] long iColumn);
      HRESULT aboutToDeleteRows([in] long iRow, [in] long iColumn);
      HRESULT deletedRows([in] long iRow, [in] long cRows);
      HRESULT aboutToInsertRows([in] long iRow, [in] long cRows);
      HRESULT insertedRows([in] long iRow, [in] long cRows);
      HRESULT rowsAvailable([in] long iRow, [in] long cRows);
      HRESULT transferComplete([in] OSPXFER xfer); // <---!!!

(from the MSDN TDC sample)

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