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<!-- received="Fri Nov 5 07:30:22 1999 PST" -->
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<!-- sent="Fri, 5 Nov 1999 12:19:36 +0000" -->
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<!-- name="Dave Restall - System Administrator" -->
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<!-- email="dave@restall.net" -->
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<!-- subject="Questions re Sane API digression & MF Scanner" -->
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<!-- id="E11jiLA-0000aM-00@basil.restall.net" -->
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<title>sane-devel: Questions re Sane API digression & MF Scanner</title>
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<h1>Questions re Sane API digression & MF Scanner</h1>
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<b>Dave Restall - System Administrator</b> (<a href="mailto:dave@restall.net"><i>dave@restall.net</i></a>)<br>
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<i>Fri, 5 Nov 1999 12:19:36 +0000</i>
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<p>
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<ul>
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<li> <b>Messages sorted by:</b> <a href="date.html#36">[ date ]</a><a href="index.html#36">[ thread ]</a><a href="subject.html#36">[ subject ]</a><a href="author.html#36">[ author ]</a>
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<li> <b>Next message:</b> <a href="0037.html">Vincent Parrilla: "Re: sane doesnt work under red hat 6.1 (again)!"</a>
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<li> <b>Previous message:</b> <a href="0035.html">Giovanni Biscuolo: "Re: sane doesnt work under red hat 6.1 (again)!"</a>
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</ul>
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Hi,<br>
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<p>
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I have started writing a backend for the Scanace 9630 scanner and<br>
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unfortunately I hit a brick wall at my first attempt. The brick wall<br>
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being :-<br>
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<p>
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The API seems pretty clear to follow and relatively simple to<br>
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implement, however there are a few things that I don't understand in the<br>
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code that I've looked at for backends. I'm only dealing with sane_init<br>
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here, but the API says this :-<br>
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<p>
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"The version code of the backend is returned in the value pointed to by<br>
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version_code. If the pointer is NULL, no version code is returned.<br>
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Argument authorize is either a pointer to a function that is invoked<br>
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when the backend requires authentication for a specific resource or NULL<br>
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if the frontend does not support authentication."<br>
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<p>
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Regarding authorization, should "frontend" read "backend" ?<br>
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<p>
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Apart from that this bit of the spec seems pretty clear, however when I<br>
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started to read the code for other backends, all sorts of stuff seems to<br>
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go on, especially when it comes to initialising the hardware. Surely<br>
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this belongs in sane_open ?<br>
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<p>
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I also don't understand the following :-<br>
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<p>
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stubs.c What is it for ?<br>
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<p>
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I was hoping it would be a pile of function stubs with comments in like<br>
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"put code for function Y here" in it, e.g. a template for the backend<br>
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but it seems to have a more sinister use.<br>
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<p>
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What does the ENTRY macro do in stubs.c ?<br>
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<p>
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I'm not new to C but am new to the style used in the code development<br>
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for sane so all help will be greatly appreciated.<br>
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<p>
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I'm also willing to create an empty template with the "Put code to do X<br>
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for your scanner here" if it will help and write the FAQ for writing a<br>
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backend but I'll need help and guidance, can I use the list for this ?<br>
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<p>
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My other question, I'm looking for a film scanner and liked the look of<br>
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the Minolta Dimage series, Minolta don't seem to have any supported<br>
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scanners. Is this because nobody has tried or is it because Minolta<br>
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won't release any information ?<br>
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<p>
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If Minolta won't play, can anybody recommend a suitable film scanner<br>
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that meets the following :-<br>
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<p>
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Can scan :-<br>
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<p>
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35mm Negatives (singly or in strips)<br>
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35mm Transparencies (Singly in frames, or in strips)<br>
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Medium Format Negatives (Singly, in strips would be nice to have)<br>
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Medium Format Transparencies (Singly, in strips would be nice to have)<br>
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<p>
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Optionally APS negatives and transparencies.<br>
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<p>
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Sorry about the length of the mail, lets hope you can help.<br>
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<p>
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Regards,<br>
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<p>
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<p>
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Dave.<br>
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mail/sane/991105.tx sane<br>
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+----------------------------------------------------------------------------+<br>
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<i>| Dave Restall Internet Intranet Resourcing Consultancy Limited |</i><br>
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<i>| Tel. +44 (0) 1287 653003 Mob. +44 (0) 973 831245 Fax. +44 (0) 1287 653440 |</i><br>
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<i>| email : <a href="mailto:dave@iirc.net">dave@iirc.net</a> dave@restall.net Web : <a href="http://www.iirc.net">http://www.iirc.net</a> |</i><br>
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+----------------------------------------------------------------------------+<br>
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<i>| You should all JUMP UP AND DOWN for TWO HOURS while I decide on a |</i><br>
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<i>| NEW CAREER!! |</i><br>
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+----------------------------------------------------------------------------+<br>
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<p>
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<p>
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<pre>
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--
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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">majordomo@mostang.com</a>
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</pre>
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<!-- body="end" -->
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<p>
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<ul>
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<!-- next="start" -->
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<li> <b>Next message:</b> <a href="0037.html">Vincent Parrilla: "Re: sane doesnt work under red hat 6.1 (again)!"</a>
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<li> <b>Previous message:</b> <a href="0035.html">Giovanni Biscuolo: "Re: sane doesnt work under red hat 6.1 (again)!"</a>
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<!-- nextthread="start" -->
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