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

[Florian Lohoff]

On Sun, Apr 12, 2009 at 11:00:38PM +0200, Florian Lohoff wrote:
> Subject: Re: [sane-devel] SANE API / How to detect disconnect of scanner
> 
> On Sun, Apr 12, 2009 at 03:23:06PM -0400, m. allan noah wrote:
> > Well, I wrote the fujitsu backend, so I feel justified in saying that
> > is a bug :) What version of sane-backends are you using?
> 
> Debian lenny package
> 
> ii  libsane                              1.0.19-23                     API library for scanners
> ii  libsane-dev                          1.0.19-23                     API development library for scanners [development file
> ii  libsane-extras                       1.0.19.11                     API library for scanners -- extra backends
> ii  libsane-extras-dev                   1.0.19.11                     API development library for scanners [development file
> ii  sane                                 1.0.14-7                      scanner graphical frontends
> ii  sane-utils                           1.0.19-23                     API library for scanners -- utilities

I already had a look at the code and the only way for the fujitsu backend
to make an immediate read or write with returning the state is set_sleep_mode
it seems.

It would be nice to extend the SANE api to explicitly only query for hardware
state. I guess there is more use of that function than my little toying
with scanner buttons. For long running applications which open the device
its wise to regularly check if the hardware is still there.

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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