This depends on what you mean with "data". If you mean the whole frame then you can just look at the decode pane (the middle pane by default) to see the human readable form of the information, at least for the protocol headers. If you're talking about your application payload (the data transported by Ethernet/IP/UDP/TCP...) then you can usually read it as long as it is in ASCII. If its a binary data format you need to dissect it yourself or write your own dissector to do it for you.
answered 25 May '11, 23:50
What I do is export packet content to txt file. File->Export->File... and then in the Packet format filed decide the depth of information.
answered 27 May '11, 00:41