Ethereal-dev: Re: [Ethereal-dev] Newbie - Plugin Dissector Only entered with non-zero tree onc

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From: Guy Harris <gharris@xxxxxxxxx>
Date: Wed, 1 May 2002 03:23:24 -0700
On Wed, May 01, 2002 at 03:12:21AM -0700, Harry Goldschmitt wrote:
> I'm writing a new plug in dissector under RH 7.2 Ethereal 0.8.18.  I 
> have a large file of packets for the TCP based protocol I'm trying to 
> dissect.  The dissector correctly creates lines in the traffic 
> summary window, and via printf's I can see that it was entered once 
> in the dissect_protocol routine with a non-zero tree.  At that time, 
> I create a proto_tree for the first packet.  I can see it in the 
> window, while the file is loading.  As soon as the load completes, my 
> proto_tree disappears and my dissector is never entered again with a 
> non-zero tree.  I can click around the summary window to my hearts 
> content, but never another non-zero tree.

(I assume by "non-zero tree" you mean a non-null "tree" argument.)

Are there any frames in the summary window where the "Protocol" column
indicates that your dissector dissected that frame?

If so, is your dissector called with a non-null "tree" argument if you
click on one of those frames?