Re: Protocol tree - indicating a missing value

[Paul Offord <Paul.Offord () advance7 com>]

Thanks Pascal.

Having thought about it I’ve realised that I should stick to the standard that if the value is missing I shouldn’t 
render the item in the tree.

Best regards…Paul

From: Wireshark-dev [mailto:wireshark-dev-bounces () wireshark org] On Behalf Of Pascal Quantin
Sent: 02 November 2017 09:37
To: Developer support list for Wireshark <wireshark-dev () wireshark org>
Subject: Re: [Wireshark-dev] Protocol tree - indicating a missing value

Hi Paul,

2017-11-02 10:17 GMT+01:00 Paul Offord <Paul.Offord () advance7 com<mailto:Paul.Offord () advance7 com>>:
Hi,

Is it possible to add an item to the protocol tree but indicate in some way that the value for the field is missing?  I 
want to produce something like this:

Frame 13: 155 bytes on wire (1240 bits), 155 bytes captured (1240 bits) on interface 0
Ethernet II, Src: 00:00:00_0b:ab:e1 (00:00:00:0b:ab:e1), Dst: 00:00:00_0b:ab:e1 (00:00:00:0b:ab:e1)
Babel Data Scope
    Message header
    Log Data
        host: 192.168.5.4
        identid: -
        userid: mattyo
        datetime: [30/Oct/2017:08:12:36 +0000]
        request: POST /TimeRec.php HTTP/1.1
        response code: 302
        bytes returned: -

In this mock up, identid and bytes returned values are missing.

I’ve tried using:

        proto_tree_add_item(tree, p_hf->hfinfo.id<http://hfinfo.id>, tvb, 0, -1, ENC_NA);

where p_hf points to the correct field entry in the hf_register_info array but that results in Malformed Packet errors.

[cid:image002.jpg@01D353C9.9B71BA50]

Any ideas?

Empty / missing fields are supported for FT_BYTES and FT_UINT_BYTES. If I remember correctly, this is displayed when 
the length is 0 bytes long. This is not expected for other types of items.

Pascal.

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