[sane-devel] SANE API / How to detect disconnect of scanner

m. allan noah kitno455 at gmail.com
Sun Apr 12 19:23:06 UTC 2009

Well, I wrote the fujitsu backend, so I feel justified in saying that
is a bug :) What version of sane-backends are you using?


On Sun, Apr 12, 2009 at 3:04 PM, Florian Lohoff <flo at rfc822.org> wrote:
> On Sun, Apr 12, 2009 at 09:11:16AM +0200, Florian Lohoff wrote:
>> Hi,
>> i am writing my own little scanner button handling which works without the problem.
>> I am trying to attach the scanner (via USB) to a headles system. So in the
>> end i 'd like to start the scanner button program via udev and let it
>> die once the user turns off the scanner.
>> I would have expected sane_control_option to return an error message once
>> the scanner gets turned off (disconnected) but it still returns
>> 0 aka SANE_STATUS_GOOD which is astonishing..
>> Whats the proposed way to detect a disconnected scanner? Should i reopen the scanner
>> on every 1 sec polling interval?!?
> As i got a hint that the backend would be an important point - The backend
> in this case is the fujitsu - fi 4120C on USB
> Flo
> --
> Florian Lohoff                  flo at rfc822.org             +49-171-2280134
>        Those who would give up a little freedom to get a little
>          security shall soon have neither - Benjamin Franklin
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"The truth is an offense, but not a sin"

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