C# Signature:

    /// <summary>
    /// The GetHGlobalFromILockBytes function retrieves a global memory handle to a
    /// byte array object created using the CreateILockBytesOnHGlobal function.
    /// </summary>
    ///
    /// <param name="pLkbyt">Pointer to the ILockBytes interface on the byte-array
    /// object previously created by a call to the CreateILockBytesOnHGlobal function.</param>
    ///
    /// <param name="phglobal">Pointer to the current memory handle used by the
    /// specified byte-array object.</param>
    ///
    /// <returns></returns>
    [DllImport("ole32.dll")]
    static extern int GetHGlobalFromILockBytes(ILockBytes pLkbyt, out IntPtr phglobal);

or

[DllImport("ole32.dll",
     EntryPoint="GetHGlobalFromILockBytes",
     ExactSpelling=true, PreserveSig=true, CharSet=CharSet.Ansi,
     CallingConvention=CallingConvention.StdCall)]
static extern int GetHGlobalFromILockBytes([MarshalAs(UnmanagedType.Interface)] object /* ILockBytes* */pLkbyt, out IntPtr /* HGLOBAL* */ phglobal);

User-Defined Types:

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Notes:

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