C# Signature:

[DllImport("ole32.dll")]
static extern int CoUnmarshalInterface(UCOMIStream pStm, [In] ref Guid riid,
   [MarshalAs(UnmanagedType.IUnknown)] out object ppv);

[DllImport("ole32.dll")]
static extern int CoUnmarshalInterface(System.Runtime.InteropServices.ComTypes.IStream pStm, [In] ref Guid riid,
   [MarshalAs(UnmanagedType.IUnknown)] out object ppv);

User-Defined Types:

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Notes:

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