[sane-devel] button query

m. allan noah kitno455 at gmail.com
Thu Nov 18 12:23:56 UTC 2010

Initial implementation of buttons relied on 'magic' names. Later, this
was changed to use the 'cap' on the option. Look for options with
these set:


TYPE_BUTTON is really only used to indicate a boolean software option
that won't 'stick'.


On Thu, Nov 18, 2010 at 6:00 AM, Florian Lohoff <f at zz.de> wrote:
> Hi,
> i once wrote a little C app to poll my document scanner (Fujitu fi4120C)
> for the buttons on the front (Function digit, "scan" and "send to").
> I now tried to recompile it against libsane 1.0.21-5 (from 1.0.19-23)
> and now my tool fails.
> After a bit debugging the buttons i found that from the results of
> sane_get_option_descriptor the buttons got renamed
> from e.g. "button-scan" to "scan" and the like.
> So i thought - well - lets see if there is an identifier and found
> that there is "type" in the SANE_Option_Descriptor which in case
> of the scan button is "bool" although there is a TYPE_BUTTON which
> i thought would be a better fit.
> Although it is unclear how i could find the "function" button which itself is
> not queriable but only the digit one can toggle through.
> Its a button but also an integer.
> Hints? Bug? Feature? Incomplete transition in the backend?
> How am i supposed to automatically find the buttons?
> Flo
> --
> Florian Lohoff                                                 f at zz.de
>                 Professionell gesehen bin ich zu haben ....
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> =9g1e
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