[sane-devel] how do I use scanner hardware sensors (e.g. scan button)?

[m. allan noah]

Button support is one of the weak parts of sane. The button options
exposed by the fujitsu backend (and most others) are read-only. They
can be 'polled' periodically by a front-end program, which will then
activate the appropriate command to perform the requested action. They
cannot be used directly. Unfortunately, there is not a good
general-purpose polling frontend yet written, though there is a good
start in our old experimental tree.

allan

On Mon, Jan 18, 2010 at 5:49 PM, Arthur Hebert <arthur at evcl.com> wrote:
> Hello,
>
> I have setup SANE to work with my Fujitsu fi-6130 scanner. How do I use SANE
> to work with my scanner's "Scan" button? The regular command,
>
>> scanimage --format tiff > foo.tiff
>
> works as expected. However, the command
>
>> scanimage --format tiff --scan=yes > foo.tiff
>
> results in the error
>
>> scanimage: unrecognized option `--scan=yes'
>
>
> My system is Mac OS X 10.5. The command scanimage --help produces output,
> which includes awareness of the hardware sensors:
>
>>
>> ... <snip>
>>
>>   Sensors:
>>     --top-edge[=(yes|no)] [no] [hardware]
>>         Paper is pulled partly into adf
>>     --a3-paper[=(yes|no)] [no] [hardware]
>>         A3 paper detected
>>     --b4-paper[=(yes|no)] [no] [hardware]
>>         B4 paper detected
>>     --a4-paper[=(yes|no)] [no] [hardware]
>>         A4 paper detected
>>     --b5-paper[=(yes|no)] [no] [hardware]
>>         B5 paper detected
>>     --page-loaded[=(yes|no)] [no] [hardware]
>>         Page loaded
>>     --omr-df[=(yes|no)] [no] [hardware]
>>         OMR or double feed detected
>>     --cover-open[=(yes|no)] [no] [hardware]
>>         Cover open
>>     --power-save[=(yes|no)] [no] [hardware]
>>         Scanner in power saving mode
>>     --email[=(yes|no)] [no] [hardware]
>>         Email button
>>     --manual-feed[=(yes|no)] [no] [hardware]
>>         Manual feed selected
>>     --scan[=(yes|no)] [no] [hardware]
>>         Scan button
>>     --function <int> [0] [hardware]
>>         Function character on screen
>>     --double-feed[=(yes|no)] [no] [hardware]
>>         Double feed detected
>>     --error-code <int> [0] [hardware]
>>         Hardware error code
>>     --skew-angle <int> [0] [hardware]
>>         Requires black background for scanning
>>
>> Type ``scanimage --help -d DEVICE'' to get list of all options for DEVICE.
>>
>> List of available devices:
>>     fujitsu:fi-6130dj:90080
>
> Thanks,
> Arthur
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