Hi Guy,
I think this is a good solution.
This way I can avoid to write a parser function for each field name and can
keep the "type-parser".
Generating all the hf register entries is not a bidg deal.
thanks,
Gerhard.
On Thursday 01 February 2007 19:42, Guy Harris wrote:
> Gerhard Gappmeier wrote:
> > The problem is, that I want to output the field name, and not the type
> > of a field.
> > Is there a way to do that with /hf_register_info/?
>
> Yes. The first element of a header_field_info structure is the name of
> the field, and that's what's used in the display string when
> proto_tree_add_item() enters an instance of a field into the protocol tree.
>
> I would suggest, therefore, that you *NOT* create registered fields
> corresponding to the basic types, because that means that all fields of
> a given type have the same name. Instead, create registered fields
> corresponding to protocol fields with those types, e.g.:
>
> static hf_register_info hf[] =
> {
> { &hf_opcua_isforward,
> { "IsForward", "isforward", FT_BOOLEAN, BASE_NONE, NULL, 0x0, "", HFILL
> } },
>
> ...
> };
>
> and have the parsers for simple types take, as arguments, the hf index
> value of the field, not its name:
>
> /* Simple Type Boolean */
> static void parseBoolean(proto_tree *tree, tvbuff_t *tvb, gint
> *pOffset, int hf)
> {
> proto_tree_add_item(tree, hf, tvb, *pOffset, 1, TRUE);
> *pOffset+=1;
> }
>
> That also means that you could look for all packets with IsForward true
> with a filter such as
>
> opcua.isforward == 1
>
> (just "opcua.isforward", without a relational operator, checks for all
> packets that have an "opcua.isforward" field, regardless of its value).
> You can't do that if you use the same field for all Boolean types.
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--
mit freundlichen Grüßen / best regards
Gerhard Gappmeier
ascolab GmbH - automation system communication laboratory
Tel.: +49 9131 691 123
Fax: +49 9131 691 128
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