Wireshark-dev: Re: [Wireshark-dev] Custom formatter for 64bit field
From: "Maynard, Chris" <[email protected]>
Date: Thu, 11 Mar 2010 17:53:48 -0500
I think the problem is that the custom format function takes a guint32 as its 2nd argument and you need a guint64, so unless this is changed to a guint64, you will have to modify your declaration to some other BASE_ supported by FT_UINT64 and then use one of the other proto_tree_add_XYZ() routines such as proto_tree_add_uint64_format().

>From README.developer:
BASE_CUSTOM allows one to specify a callback function pointer that will
format the value. The function pointer of the same type as defined by
custom_fmt_func_t in epan/proto.h, specifically:

  void func(gchar *, guint32);

- Chris

-----Original Message-----
From: [email protected] [mailto:[email protected]] On Behalf Of David Arnold
Sent: Thursday, March 11, 2010 5:25 PM
To: [email protected]
Subject: [Wireshark-dev] Custom formatter for 64bit field

Hi!

I'm writing a dissector for a protocol that uses a 64-bit time field
which is not in the format required for FT_ABSOLUTE_TIME.

So, I declared the hfinfo like

        { &hf_prot_pkthdr_time,
          { "Transmit Time", "prot.time",
            FT_UINT64, BASE_CUSTOM,
            prot_fmt_time, 0x0,
            "Transmission timestamp",
            HFILL }
        }

However, this causes an abort from the assertion in proto.c:4182
(trunk), which checks that hfinfo->strings is NULL (no, because of the
custom formatter), or the type matches a set that doesn't include
FT_UINT64.

This is my first attempt at writing a dissector, so I'm sure I'm missing
something.  Can someone point me in the right direction?

Thanks,




d

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