[sane-devel] scanimage -T hangs forever

[m. allan noah]

On Nov 20, 2007 10:11 AM, Gerhard Jaeger <gerhard at gjaeger.de> wrote:
> Am Dienstag, 20. November 2007 14:01:05 schrieb m. allan noah:
>
> > On 11/20/07, Johannes Meixner <jsmeix at suse.de> wrote:
> > >
> > > Hello,
> > >
> > > On Nov 19 15:38 m. allan noah wrote (shortened):
> > > > why are you trying to use the -T?
> > >
> > > I thought "scanimage -d... -T" is the right way to do a test?
> > >
> > > I use it in the YaST scanner config tool to provide a [Test] option
> > > for the user to test if his scanner/backend combination works.
> > >
> > > Should I better use "scanimage -d... >/dev/null" for a test?
> >
> > the -T test just tries using a variety of buffer sizes during the data
> > transfer, followed by a cancel (instead of completing the scan) IIRC.
> > This might put some scanners/backends into a funk, as they dont
> > properly implement the cancel.
> >
> > i would not assume that every scanner/backend combination will act
> > properly with -T.
> >
>
> But in fact they should! A real working cancel is essential for
> a good working frontend - IMHO!
> Otherwise you always have to wait until a scan has finished even
> if you see that it's crap - not really user-friendly.
>

i agree in principle, but i would say it is the purpose of -T for the
backend author to test his code, not for the scanner owner to test the
machine.

allan
-- 
"The truth is an offense, but not a sin"