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Printing an array of bytes to the tree?

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ykaul at checkpoint

Aug 12, 2002, 8:46 AM

Post #1 of 5 (1223 views)
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Printing an array of bytes to the tree?

Is there an intelligent way to print an array of bytes to the tree?
I'd like to have something like:

"array: 0x0102030405060708090A"

Thanks in advance,
Y.

guy at netapp

Aug 12, 2002, 10:39 AM

Post #2 of 5 (1155 views)
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Re: Printing an array of bytes to the tree? [In reply to]

On Mon, Aug 12, 2002 at 05:46:12PM +0200, Yaniv Kaul wrote:
> Is there an intelligent way to print an array of bytes to the tree?
> I'd like to have something like:
>
> "array: 0x0102030405060708090A"

If the array of bytes is a named field, just make it a field of type
FT_BYTES.

If it's not a named field, and you're putting it into the protocol tree
with "proto_tree_add_text()", use "tvb_bytes_to_str()".

Doing one of those won't put a leading "0x" in there, and will just put
in a "..." after 16 bytes rather than showing ever single byte (16 is
1/2 the value of the #define MAX_BYTE_STR_LEN in epan/strutil.c -
MAX_BYTE_STR_LEN is the number of characters in the display, and each
byte is shown as 2 hex digits - so it could be increased), but it's the
type of thing you're asking for .

ykaul at netvision

Aug 15, 2002, 12:31 AM

Post #3 of 5 (1148 views)
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RE: Printing an array of bytes to the tree? [In reply to]

Thanks.

tvb_bytes_to_str() is not documented in doc/README.developer.

> -----Original Message-----
> From: Guy Harris [mailto:guy [at] netapp]
> Sent: Mon, August 12, 2002 7:39 PM
> To: Yaniv Kaul
> Cc: Ethereal-Dev [at] ethereal
> Subject: Re: [Ethereal-dev] Printing an array of bytes to the tree?
>
>
> On Mon, Aug 12, 2002 at 05:46:12PM +0200, Yaniv Kaul wrote:
> > Is there an intelligent way to print an array of bytes to the tree?
> > I'd like to have something like:
> >
> > "array: 0x0102030405060708090A"
>
> If the array of bytes is a named field, just make it a field of type
> FT_BYTES.
>
> If it's not a named field, and you're putting it into the protocol tree
> with "proto_tree_add_text()", use "tvb_bytes_to_str()".
>
> Doing one of those won't put a leading "0x" in there, and will just put
> in a "..." after 16 bytes rather than showing ever single byte (16 is
> 1/2 the value of the #define MAX_BYTE_STR_LEN in epan/strutil.c -
> MAX_BYTE_STR_LEN is the number of characters in the display, and each
> byte is shown as 2 hex digits - so it could be increased), but it's the
> type of thing you're asking for .
>

snader12 at gmail

May 19, 2006, 10:34 AM

Post #4 of 5 (1145 views)
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Re: Printing an array of bytes to the tree? [In reply to]

I've tried using the following named field:

...

&hf_my_hex_string,

{

"A Hex String",

"myproto.hexstr",

FT_BYTES,

BASE_HEX,

NULL,

0x0,

"",

HFILL

}

...

But printing to the subtree never showed anything when the dissector makes
this call:

if (tree)

{

proto_tree_add_item(myproto_tree, hf_my_hex_string, tvb, offset, 24, FALSE);

}

Is there anything that I'm missing or is it just not possible to print that
many hex characters?

Thanks,
Saad

jaap.keuter at xs4all

Jun 6, 2006, 9:17 AM

Post #5 of 5 (1153 views)
Permalink

Re: Printing an array of bytes to the tree? [In reply to]

Hi,

Sure it can. Did you register the field?
What code is used to create the subtree?

Thanx,
Jaap

On Fri, 19 May 2006, Saad Nader wrote:

> I've tried using the following named field:
>
>
>
> ...
>
> &hf_my_hex_string,
>
> {
>
> "A Hex String",
>
> "myproto.hexstr",
>
> FT_BYTES,
>
> BASE_HEX,
>
> NULL,
>
> 0x0,
>
> "",
>
> HFILL
>
> }
>
> ...
>
>
>
> But printing to the subtree never showed anything when the dissector makes
> this call:
>
>
>
> if (tree)
>
> {
>
> proto_tree_add_item(myproto_tree, hf_my_hex_string, tvb, offset, 24, FALSE);
>
> }
>
>
>
> Is there anything that I'm missing or is it just not possible to print that
> many hex characters?
>
>
>
> Thanks,
> Saad
>

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