Wireshark mailing list archives
Re: Dynamic value string
From: Guy Harris <guy () alum mit edu>
Date: Fri, 9 Sep 2011 09:56:49 -0700
On Sep 9, 2011, at 9:49 AM, Sylvain Munaut wrote:
My idea was to extend the value_string to include a 'DYNAMIC' version where a call back of the dissector would be called with the value and should return a string to display. Obviously that string would have to be g_malloc'ed by the callback and then g_free'ed by the caller. (or give a buffer to write into to the call back, but then there is a size limit). Is there any solution I missed ?
Well, at least in 1.6.x and later (I don't know whether this was supported in 1.4.x), doc/README.developer says: display ------- The display field has a couple of overloaded uses. This is unfortunate, but since we're using C as an application programming language, this sometimes makes for cleaner programs. Right now I still think that overloading this variable was okay. For integer fields (FT_UINT* and FT_INT*), this variable represents the base in which you would like the value displayed. The acceptable bases are: BASE_DEC, BASE_HEX, BASE_OCT, BASE_DEC_HEX, BASE_HEX_DEC, BASE_CUSTOM BASE_DEC, BASE_HEX, and BASE_OCT are decimal, hexadecimal, and octal, respectively. BASE_DEC_HEX and BASE_HEX_DEC display value in two bases (the 1st representation followed by the 2nd in parenthesis). 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); The first argument is a pointer to a buffer of the ITEM_LABEL_LENGTH size and the second argument is the value to be formatted. ___________________________________________________________________________ Sent via: Wireshark-dev mailing list <wireshark-dev () wireshark org> Archives: http://www.wireshark.org/lists/wireshark-dev Unsubscribe: https://wireshark.org/mailman/options/wireshark-dev mailto:wireshark-dev-request () wireshark org?subject=unsubscribe
Current thread:
- Dynamic value string Sylvain Munaut (Sep 09)
- Re: Dynamic value string Guy Harris (Sep 09)
- Re: Dynamic value string Sylvain Munaut (Sep 09)
- Re: Dynamic value string Guy Harris (Sep 09)