Hi Guy,
I think you are right. When I thought about it I realised that dissected field values don't get stored anywhere in a standard way and retrieving them from the tree is the only way to go. Luckily I only need a few values.
If proto_find_finfo() is slow I might try writing something to traverse the tree. I notice that proto_find_finfo() does memory allocations and I can probably avoid this by retrieving the data directly into my own variable.
Best regards...Paul
-----Original Message-----
From: wireshark-dev-bounces@xxxxxxxxxxxxx [mailto:wireshark-dev-bounces@xxxxxxxxxxxxx] On Behalf Of Guy Harris
Sent: 05 September 2016 03:59
To: Developer support list for Wireshark <wireshark-dev@xxxxxxxxxxxxx>
Subject: Re: [Wireshark-dev] Extracting field values in a C post-dissector
On Aug 22, 2016, at 6:40 AM, Pascal Quantin <pascal.quantin@xxxxxxxxx> wrote:
> By having a quick look at the code, I *think* you will want first to retrieve the hfindex of a given field by using proto_registrar_get_id_byname(), then mark it as "interesting" with proto_tree_prime_hfid()
...which you have to do before the dissection starts.
Unfortunately, you can't do that in a post-dissector.
So...
> aOr a cll to proto_find_finfo() should work also without the need to prime the field, but should be slower according to the comments in proto.h.
...you might have to do it that way, instead.
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