[Guy Harris <gharris@xxxxxxxxx>]

Gilbert Ramirez wrote:
> You can't. Wiretap is a library for reading/writing bytes to a file.
> It has no idea about columns in ethereal or tethereal. If you are
> trying to display information in the columns, then it sounds like you
> should be developing or modifying a dissector, not a wiretap module.

Although if (as he's said in earlier messages) he's writing code to read 
a new file format, he needs to write a wiretap module *AND* a dissector 
for whatever new protocol the file format supplies or whatever old 
protocol plus new pseudo-header the wiretap module supplies - unless the 
column comes from data that's already provided by Ethereal, in which 
case the code to put data into the column should just be added to the 
relevant existing dissectors.

We'd need more details on what he's doing in order to give him future 
advice.