/// The GetHGlobalFromILockBytes function retrieves a global memory handle to a

    static extern int GetHGlobalFromILockBytes(ILockBytes pLkbyt, out IntPtr phglobal);

     EntryPoint="GetHGlobalFromILockBytes",

static extern int GetHGlobalFromILockBytes([MarshalAs(UnmanagedType.Interface)] object /* ILockBytes* */pLkbyt, out IntPtr /* HGLOBAL* */ phglobal);