Re: When is the preference variable updated?

[Pascal Quantin <pascal.quantin () gmail com>]

2015-11-12 15:07 GMT+01:00 Paul Offord <Paul.Offord () advance7 com>:

> Hi,
>
>
>
> Frankly I feel a bit stupid asking this but I've been trying to figure it
> out for about 6 hours and I think I need help.  I have a dissector which I
> register like this:
>
>
>
> static int tmsvc_port = 0;
>
>
>
> void
>
> proto_register_tmsvc(void)
>
> {
>
>     module_t *tmsvc_module;
>
>
>
>     proto_tmsvc = proto_register_protocol("TM Syncro Service",
>
>                                           "TmSyncro",
>
>                                           "tmsvc");
>
>
>
>     tmsvc_module = prefs_register_protocol(proto_tmsvc, NULL);
>
>
>
>     prefs_register_uint_preference(tmsvc_module, "port",
>
>                                    "TmSyncro service port",
>
>                                    "When set to a value greater than 0 the
> TmSyncro service is started and accessible via the port number"
>
>                                    10,
>
>                                    &tmsvc_port);
>
>
>
> }
>
>
>
> Immediately after the prefs_register_uint_preference call I check the
> tmsvc_port value and its still 0 (and I've tried other initialisation
> values and they remain unchanged).  I was expecting tmsvc_port to be set to
> the value I last set by editing the preferences through the Wireshark menu
> system.
>
>
>
> If I check with Menu -> Edit -> Preferences -> Protocols -> TmSyncro sure
> enough the value I last set is there.
>
>
>
> When does my variable get updated?  Or alternatively, how can I retrieve
> the saved preference value?
>
>
>
> Thanks and regards...Paul

Hi Paul,

the variable should be set according to the preference content when the
proto_reg_handoff_tmsvc function (that you register thanks to the
prefs_register_protocol function) is called. Alternatively (if you do not
need the reg_handoff function at all) the variable should be set when your
dissector code is called.

Best regards,
Pascal.

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