[Guy Harris <guy@xxxxxxxxxxxx>]

On Sep 15, 2003, at 5:15 PM, Kevin A. Noll wrote:

> Using other dissectors as examples, I am able to register the 
> preference
> and I can change the value in the preferences dialog. However,
> when I change the value that I want to use, the decode does not change
> appropriately.
>
> So, how do I get the decode to use the preference that I am setting?
You have to arrange that a routine that changes the dissector 
registration be called when the preference changes.  See, for example, 
"packet-beep.c", which arranges that its "reg_handoff" routine be 
called when any preferences change; that routine will, if it's already 
been called once to register the dissector, un-register it with a call 
to "dissector_delete()" with the old value of the preference before 
registering, with "dissector_add()", with the new value of the 
preference.