[sane-devel] Canon Mx 700 - Scanbuttons

[Louis Lagendijk]

On Wed, 2012-09-26 at 07:58 +0200, Wilhelm wrote:
> Am 25.09.2012 19:54, schrieb Nelson:
> >>> On Sat, 2012-08-11 at 20:22 +0200, Louis Lagendijk wrote:
> >>>
> >>>> hello Nelson/ list,
> >>>
> >>> As I was working on the scan button support, I found out that my
> >>> multi-function (MP980) does support IPv6 (I completely forgot). So I
> >>> have added IPv6 support for the pixma backend. The changes for button
> >>> support and IPv6 are now in git. Please test
> >>> Kind regards, Louis
> >>>
> >>>
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> >>
> >> Hey Louis,
> >> very good job. My scanner works now by using the buttons.
> >>
> >> --
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> > Hey Louis,
> > by using sane-backend(last git) with comandline, my scanner works with the buttons. E.g. scanimage buttoncontrolled=yes ....
> >
> >
> > But scanbd can't read the buttonstatus. It's a bug or not implemented? All the options are available, but scanbd shows no action by using the buttons.
> 
> just to clearify: scanbd can read the buttons (e.g. a button-option with 
> name "button-1") but the value of this particular option never changes 
> when the user presses a button. A quick look in to the pixma 
> backend-sources suggests that querying the button values isn't supported 
> ... ?

I finally found some time to dig into the backend to see what it does
and how to use it (too many other things to do and been ill for a
while). I now understand how things work. 

The button-1 and button-2 options are set when sane_control_option() is
called for option button_update with action SANE_ACTION_SET_VALUE.
SANE_ACTION_SET_VALUE button_update is used to poll the scanner and set
button-1 and button-2. But scanbd does not support
SANE_ACTION_SET_VALUE.
 
My patch from a week ago was not correct as it ignores how the buttons
are supposed to be used. I am looking into the best way to solve this.

I need to check, but I seem to recall that there is an indication in the
USB protocol that indicates what option (save, pdf, attach to email etc)
was chosen. If this is true, I may try to add an option for that as
well.

Kind regards, Louis