Re: displaying header field without filtering capability

[Evan Huus <eapache () gmail com>]

You could use proto_tree_add_text but that is strongly recommended
against. Why do you want to explicitly disallow filtering? If the
field is reserved and not important you could just not add any item at
all, and skip that byte entirely...

On Wed, Feb 19, 2014 at 4:17 PM, John Dill <John.Dill () greenfieldeng com> wrote:
> I'm trying to add a header field for spare bytes in a custom dissector.
>
> Currently, I'm creating a header field for a 'Spare' data element in a
> 'Status' message, as shown in the example below:
>
> \code snippet
> {
>   &hf_Spare,
>   {
>     "Spare",
>     "msg.Status.Spare",
>     FT_UINT8,
>     BASE_HEX,
>     NULL,
>     0x0,
>     "Spare",
>     HFILL
>   }
> },
> \endcode
>
> Later I have a function that processes the 'Status' message components.
>
> void dissect_message_Status(tvbuff_t* tvb, gint offset, proto_tree *tree)
> {
>   proto_tree_add_item(tree, hf_Field1, tvb, offset,     1, ENC_BIG_ENDIAN);
>   proto_tree_add_item(tree, hf_Spare,  tvb, offset + 1, 1, ENC_BIG_ENDIAN);
>   proto_tree_add_item(tree, hf_Field2, tvb, offset + 2, 2, ENC_BIG_ENDIAN);
> }
>
> Visually it works great in the Packet Details pane.  The issue is that I
> don't want to allow any filtering based on the 'Spare' data field when the
> user is editing a Filter Expression.
>
> What is the recommended method to handle this scenario?  Do I need to remove
> the hf_Spare structure from the hf_register_info array and use something
> like proto_tree_add_text?  I also see something about PROTO_ITEM_SET_HIDDEN,
> but it doesn't look like it applies.
>
> Thanks,
> John Dill
>
>
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