Wireshark · Wireshark-dev: Re: [Wireshark-dev] 0.99.8 col_append_str fails

[Jason Dick <jasonkdick@xxxxxxxxx>]

Thanks for the follow-up.  Found the tutorial you mentioned and tried exactly that.  It seems that as soon as is set the text for the column, I cannot change it any more.  I tried a number of permutations and still the result is I can set it COL_INFO only once.

This a plugin dissector and everything else seems to work just fine.  I would like to add some more info to the COL_INFO for various message types that I dissect.

Any idea what changes were made to the plugin API?  

Thanks,
Jason

----- Original Message ----
From: "Maynard, Chris" <Christopher.Maynard@xxxxxxxxx>
To: Developer support list for Wireshark <wireshark-dev@xxxxxxxxxxxxx>
Sent: Sunday, March 2, 2008 5:10:47 PM
Subject: Re: [Wireshark-dev] 0.99.8 col_append_str fails

Is this a plugin dissector or normal dissector?  If it's a plugin, it
seems you're not the only one experiencing this problem, although I
highly doubt that it's a Wireshark bug.  There have been some changes to
the plugin API somewhat recently and I think your problem may be related
to that.  You might try first to re-read the most recent README.plugins
and possibly even reviewing the following tutorial:
http://www.codeproject.com/KB/IP/custom_dissector.aspx.  In addition,
it's probably a good idea to compare your plugin files with the
Wireshark built-in plugin files.

- Chris

-----Original Message-----
From: wireshark-dev-bounces@xxxxxxxxxxxxx
[mailto:wireshark-dev-bounces@xxxxxxxxxxxxx] On Behalf Of Jason Dick
Sent: Sunday, March 02, 2008 3:01 PM
To: wireshark-dev@xxxxxxxxxxxxx
Subject: [Wireshark-dev] 0.99.8 col_append_str fails

I am writing a dissector for a custom protocol and found that I am
unable to add additional information to the INFO column.  See the
following code:

if (check_col(pinfo->cinfo, COL_INFO)) {
  col_append_str(pinfo->cinfo, COL_INFO, "  more info");
}

It appears that after the initial setting of the column, pinfo->cinfo is
no longer writable.  That is 

col_get_writable(pinfo->cinfo) 

always returns false.  It still returns false even after I run:

col_set_writable(pinfo->cinfo, 1);

Has anyone else run across this?  I thought I had this working for
another dissector on 0.99.6 but I don't have that code with me right
now.

Thanks for any thoughts, comments, ideas -- Jason



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