C# Signature:

1)

    [StructLayout(LayoutKind.Sequential)]
    struct DEV_BROADCAST_DEVICEINTERFACE
    {
    public int dbcc_size;
    public int dbcc_devicetype;
    public int dbcc_reserved;
    public Guid dbcc_classguid;
    public char dbcc_name;

    public static readonly int Size = Marshal.SizeOf(typeof(DEV_BROADCAST_DEVICEINTERFACE));
    }

2)

    [StructLayout(LayoutKind.Sequential, CharSet = CharSet.Auto)]
    public struct DEV_BROADCAST_DEVICEINTERFACE
    {
            public int dbcc_size;
            public int dbcc_devicetype;
            public int dbcc_reserved;
            public Guid dbcc_classguid;
            [MarshalAs(UnmanagedType.ByValTStr, SizeConst=255)]
            public string dbcc_name;
    }

VB Signature:

Structure DEV_BROADCAST_DEVICEINTERFACE
   Public TODO
End Structure

User-Defined Field Types:

None.

Notes:

If you need to read the dbcc_name, start reading as a buffer at "dbcc_name" address until you get a '\0' character.