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<!-- received="Fri Jan 24 13:36:54 1997 MST" -->
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<!-- sent="Fri, 24 Jan 1997 15:27:56 +0100 (MET)" -->
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<!-- name="becka@sunserver1.rz.uni-duesseldorf.de" -->
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<!-- email="becka@sunserver1.rz.uni-duesseldorf.de" -->
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<!-- subject="Get-Option ..." -->
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<!-- id="m0vnmbk-000BYVC@charon.beck-sw.de" -->
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<title>sane-devel: Get-Option ...</title>
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<h1>Get-Option ...</h1>
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<a href="mailto:becka@sunserver1.rz.uni-duesseldorf.de"><i>becka@sunserver1.rz.uni-duesseldorf.de</i></a><br>
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<i>Fri, 24 Jan 1997 15:27:56 +0100 (MET)</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#42">[ date ]</a><a href="index.html#42">[ thread ]</a><a href="subject.html#42">[ subject ]</a><a href="author.html#42">[ author ]</a>
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<li> <b>Next message:</b> <a href="0043.html">becka@sunserver1.rz.uni-duesseldorf.de: "List problem ?"</a>
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<li> <b>Previous message:</b> <a href="0041.html">becka@sunserver1.rz.uni-duesseldorf.de: "Netsane working. Just making the diffs ..."</a>
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<li> <b>Next in thread:</b> <a href="0044.html">David Mosberger: "Re: Get-Option ..."</a>
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<li> <b>Maybe reply:</b> <a href="0044.html">David Mosberger: "Re: Get-Option ..."</a>
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<li> <b>Maybe reply:</b> <a href="0046.html">David Mosberger-Tang: "Re: Get-Option ..."</a>
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</ul>
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<!-- body="start" -->
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Hi Folks !<br>
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<p>
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I just noticed the cause for my problems to set an option with the<br>
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commandline scan program ...<br>
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<p>
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I can only set the LAST option, as it seems the program relies on ALL<br>
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options to be kept valid, while netsane overwrites always the same<br>
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option-descriptor.<br>
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<p>
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Well this is no problem, and I will change netsane accordingly, as it might<br>
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be necessary lateron anyway for descriptor caching, but we should state<br>
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that in the documentation just in case we get more backends that dynamically<br>
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generate their option-values.<br>
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<p>
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Current documentation is :<br>
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<p>
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\subsection{\code{sane\_get\_option\_descriptor}}<br>
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<p>
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This function is used to access option descriptors. The function<br>
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returns the option descriptor for option number \code{n} of the device<br>
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represented by handle \code{h}. Option number 0 is guaranteed to be a<br>
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valid option. Its value is an integer that specifies the number of<br>
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options that are available for device handle \code{h} (the count<br>
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includes option 0). If $n$ is not a valid option index, the function<br>
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returns \code{NULL}.<br>
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\begin{quote}\index{sane\_get\_option\_descriptor}<br>
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\begin{verbatim}<br>
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const SANE_Option_Descriptor *<br>
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sane_get_option_descriptor (SANE_Handle h, SANE_Int n);<br>
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\end{verbatim}<br>
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\end{quote}<br>
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<p>
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We probably should add :<br>
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<p>
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The acquired option descriptor stays valid at the returned address until<br>
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a "reload-option" is requested or the device is closed.<br>
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<p>
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CU,Andy<br>
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<p>
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<pre>
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--
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==============================================================================
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Andreas Beck | Email : <<a href="mailto:becka@sunserver1.rz.uni-duesseldorf.de">becka@sunserver1.rz.uni-duesseldorf.de</a>>
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=== World-Wide-Web URL : <a href="http://sunserver1.rz.uni-duesseldorf.de/~becka">http://sunserver1.rz.uni-duesseldorf.de/~becka</a> ===
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==============================================================================
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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.azstarnet.com/~axplinux/sane/">http://www.azstarnet.com/~axplinux/sane/</a>
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To unsubscribe: echo unsubscribe sane-devel | mail <a href="mailto:majordomo@azstarnet.com">majordomo@azstarnet.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="0043.html">becka@sunserver1.rz.uni-duesseldorf.de: "List problem ?"</a>
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<li> <b>Previous message:</b> <a href="0041.html">becka@sunserver1.rz.uni-duesseldorf.de: "Netsane working. Just making the diffs ..."</a>
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<!-- nextthread="start" -->
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<li> <b>Next in thread:</b> <a href="0044.html">David Mosberger: "Re: Get-Option ..."</a>
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<li> <b>Maybe reply:</b> <a href="0044.html">David Mosberger: "Re: Get-Option ..."</a>
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<li> <b>Maybe reply:</b> <a href="0046.html">David Mosberger-Tang: "Re: Get-Option ..."</a>
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<!-- reply="end" -->
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</ul>
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