Prefs.range handling in lua

Hi all,

I wonder how to threat Pref.ranges in wiresharks lua interface. I did the following:

proto.prefs.ports = Pref.range( "Ports", "23055-23056", "Ports", 65535)
function proto.init()
tcp_port_table = DissectorTable.get("tcp.port")
tcp_port_table:add(zeosys_proto.prefs.ports, zeosys_proto)

end

and got:

bad argument #1 to ‘add’ (number expected, got string)

Should I implement the range parsing on my own or are there built-in functions for this?

Cheers, Michael