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<TITLE>sane-devel: Re: Invalid argument</TITLE>
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<META NAME="Author" CONTENT="Nick Lamb (njl98r@ecs.soton.ac.uk)">
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<META NAME="Subject" CONTENT="Re: Invalid argument">
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<H1>Re: Invalid argument</H1>
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<!-- received="Fri Sep 29 18:47:03 2000" -->
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<!-- name="Nick Lamb" -->
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<STRONG>From:</STRONG> Nick Lamb (<A HREF="mailto:njl98r@ecs.soton.ac.uk?Subject=Re:%20Invalid%20argument&In-Reply-To=<20000930030515.A14068@ecs.soton.ac.uk>"><EM>njl98r@ecs.soton.ac.uk</EM></A>)<BR>
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<STRONG>Date:</STRONG> Fri Sep 29 2000 - 19:05:15 PDT
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<P>
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<LI><STRONG>Next message:</STRONG> <A HREF="0306.html">Peck Dickens: "Re: Invalid argument"</A>
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<LI><STRONG>Previous message:</STRONG> <A HREF="0304.html">Jochen Eisinger: "Re: Invalid argument"</A>
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<LI><STRONG>In reply to:</STRONG> <A HREF="0304.html">Jochen Eisinger: "Re: Invalid argument"</A>
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<LI><STRONG>Next in thread:</STRONG> <A HREF="0306.html">Peck Dickens: "Re: Invalid argument"</A>
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<LI><STRONG>Reply:</STRONG> <A HREF="0306.html">Peck Dickens: "Re: Invalid argument"</A>
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<LI><STRONG>Reply:</STRONG> <A HREF="0307.html">Claus Atzenbeck: "Re: Invalid argument"</A>
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<LI><STRONG>Reply:</STRONG> <A HREF="0308.html">Oliver Rauch: "Format of "DEVICE" [was: Invalid argument]"</A>
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<P>
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On Sat, Sep 30, 2000 at 01:59:36AM +0200, Jochen Eisinger wrote:
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<BR>
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<EM>> try
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</EM><BR>
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<EM>>
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</EM><BR>
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<EM>> #scanimage --device epson:/dev/usbcanner0
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</EM><BR>
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<P>(No particular criticism of the poster who started this thread is meant
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<BR>
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or implied by my rant)
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<BR>
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<P>When the invalid argument case occurs we should special case string[0]=='/'
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<BR>
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and print an error message which asks the user to please READ THE
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<BR>
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FUCKING MANUAL. Or better still, since today's users have been brought
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<BR>
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up to expect hand holding at every turn, just print out five or six lines
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<BR>
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explaining in detail what they did wrong.
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<BR>
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<P>jwz's approach, so far as I recall, was to add an additional explanatory
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<BR>
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line for every stupid user who asks the same question. After a few years
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<BR>
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the explanation is a page or two long, and the questions slow to a
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<BR>
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trickle then stop.
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<BR>
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<P>Here's a first attempt:
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<BR>
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<P><PRE>
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---
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You seem to have specified a UNIX device name, or filename instead of
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selecting the SANE scanner or image acquisition device you want to use.
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As an example, you might want "epson:/dev/sg0" or "hp:/dev/usbscanner0"
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If any supported devices are installed in your system, you should be
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able to see a list with "scanimage --list"
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----
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<P>Also, someone needs to make "scanimage --list" notice if no scanners
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were identified and POINT THAT OUT. The same users who are unwilling to
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read a man page will not realise that "no response" == nothing to
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report. How about:
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<P>---
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No scanners were identified. If you were expecting something different,
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check that the scanner is plugged in, turned on and detected by the
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find-scanner tool (if appropriate). Please read the documentation
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which came with this software before you use it.
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---
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<P>Adding these things is an easy project for an experienced programmer
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who is new to SANE, any volunteers?
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<P>Nick.
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<P>--
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Source code, list archive, and docs: <A HREF="http://www.mostang.com/sane/">http://www.mostang.com/sane/</A>
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To unsubscribe: echo unsubscribe sane-devel | mail <A HREF="mailto:majordomo@mostang.com?Subject=Re:%20Invalid%20argument&In-Reply-To=<20000930030515.A14068@ecs.soton.ac.uk>">majordomo@mostang.com</A>
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</PRE>
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<LI><STRONG>Next message:</STRONG> <A HREF="0306.html">Peck Dickens: "Re: Invalid argument"</A>
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<LI><STRONG>Previous message:</STRONG> <A HREF="0304.html">Jochen Eisinger: "Re: Invalid argument"</A>
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<LI><STRONG>In reply to:</STRONG> <A HREF="0304.html">Jochen Eisinger: "Re: Invalid argument"</A>
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<LI><STRONG>Next in thread:</STRONG> <A HREF="0306.html">Peck Dickens: "Re: Invalid argument"</A>
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<LI><STRONG>Reply:</STRONG> <A HREF="0306.html">Peck Dickens: "Re: Invalid argument"</A>
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<LI><STRONG>Reply:</STRONG> <A HREF="0307.html">Claus Atzenbeck: "Re: Invalid argument"</A>
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<LI><STRONG>Reply:</STRONG> <A HREF="0308.html">Oliver Rauch: "Format of "DEVICE" [was: Invalid argument]"</A>
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This archive was generated by <A HREF="http://www.hypermail.org/">hypermail 2b29</A>
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