How to compute and display custom metrics for my dissector

Hello,

I am developping a custom dissector that shall compute the maximum delay between several pdu (e.g max delay between "keep alive" pdus).

To provide the "raw data" I add this kind of code :

foo_tap = register_tap("foo"); (in proto_registerxxx)

and

tap_queue_packet(foo_tap, pinfo, &foo_info); (after dissecting packet)

To use my dissector as the tap listener, I added this code :

register_tap_listener("foo", NULL, NULL, 0, foostat_reset, foostat_packet, foostat_draw); (in proto reg handoff)

I also added the three functions foostat_reset, foostat_packet and foostat_draw.

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Now I have a few questions (I did not managed to find any example in the README.xxx):

1. How can I display my metrics ?
2. How can I keep all this code in the same dll ?
3. foostat_packet is called only when my display filter contains foo. If I do not have a foo filter, it is not called, even if I receive a foo pdu. Is this normal ?

Thank you !