Hi Pascal,
I wondered if that would be the case but it doesn’t seem to be set when I enter
the handoff code. My handoff looks like this:
proto_reg_handoff_tmsvc(void)
{
dissector_handle_t dissect_tmsvc_handle;
HANDLE h_thread;
if (tmsvc_port > 0) {
dissect_tmsvc_handle =
create_dissector_handle(dissect_tmsvc, proto_tmsvc);
register_postdissector(dissect_tmsvc_handle);
h_thread = create_service_thread();
}
return;
}
I’ve checked the value of tmsvc_port with a breakpoint set on the if statement
and it’s still 0 at this point. It is set to the saved preference 8989 by the
time of the first call to my dissector.
I notice that Anders has given me a slightly different solution and so I’ll
take a look at that next.
Thanks and regards…Paul
From: [email protected]
[mailto:[email protected]] On Behalf Of Pascal Quantin
Sent: 12 November 2015 14:15
To: Developer support list for Wireshark <[email protected]>
Subject: Re: [Wireshark-dev] When is the preference variable updated?
2015-11-12 15:07 GMT+01:00 Paul Offord
<[email protected]<mailto:[email protected]>>:
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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