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<TITLE>sane-devel: [khk@khk.net: Scanner Button Status / Is there anyt</TITLE>
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<H1>[khk@khk.net: Scanner Button Status / Is there anyting we can do with the buttons?]</H1>
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<STRONG>From:</STRONG> Karl Heinz Kremer (<A HREF="mailto:khk@khk.net?Subject=Re:%20[khk@khk.net:%20Scanner%20Button%20Status%20/%20Is%20there%20anyting%20we%20can%20do%20with%20the%20buttons?]&In-Reply-To=<20000221175259.A7890@khk.net>"><EM>khk@khk.net</EM></A>)<BR>
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<STRONG>Date:</STRONG> Mon Feb 21 2000 - 14:52:59 PST
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<LI><STRONG>Next message:</STRONG> <A HREF="0275.html">Cornelius, John: "Astra 1220S"</A>
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<LI><STRONG>Previous message:</STRONG> <A HREF="0273.html">Karl Heinz Kremer: "Re: Xsane-0.55: scan resolution selection (Epson 1200S, CVS Sane)"</A>
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<LI><STRONG>Next in thread:</STRONG> <A HREF="0277.html">Bill Thompson: "Re: [khk@khk.net: Scanner Button Status / Is there anyting we can do with the buttons?]"</A>
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<LI><STRONG>Reply:</STRONG> <A HREF="0277.html">Bill Thompson: "Re: [khk@khk.net: Scanner Button Status / Is there anyting we can do with the buttons?]"</A>
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I tried to send this to the list a few days ago, but so far I can not
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find it in the archives. Really strange: My last message to the list
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is in there twice, and this one never showed up ...
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<P>----- Forwarded message from Karl Heinz Kremer <<A HREF="mailto:khk@khk.net?Subject=Re:%20[khk@khk.net:%20Scanner%20Button%20Status%20/%20Is%20there%20anyting%20we%20can%20do%20with%20the%20buttons?]&In-Reply-To=<20000221175259.A7890@khk.net>">khk@khk.net</A>> -----
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<BR>
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<P>Date: Sat, 19 Feb 2000 13:54:48 -0500
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<BR>
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From: Karl Heinz Kremer <<A HREF="mailto:khk@khk.net?Subject=Re:%20[khk@khk.net:%20Scanner%20Button%20Status%20/%20Is%20there%20anyting%20we%20can%20do%20with%20the%20buttons?]&In-Reply-To=<20000221175259.A7890@khk.net>">khk@khk.net</A>>
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<BR>
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To: <A HREF="mailto:sane-devel@mostang.com?Subject=Re:%20[khk@khk.net:%20Scanner%20Button%20Status%20/%20Is%20there%20anyting%20we%20can%20do%20with%20the%20buttons?]&In-Reply-To=<20000221175259.A7890@khk.net>">sane-devel@mostang.com</A>
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<BR>
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Subject: Scanner Button Status / Is there anyting we can do with the buttons?
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<BR>
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Mail-Followup-To: <A HREF="mailto:sane-devel@mostang.com?Subject=Re:%20[khk@khk.net:%20Scanner%20Button%20Status%20/%20Is%20there%20anyting%20we%20can%20do%20with%20the%20buttons?]&In-Reply-To=<20000221175259.A7890@khk.net>">sane-devel@mostang.com</A>
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<BR>
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X-Mailer: Mutt 1.0i
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<BR>
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<P>Most of the scanners have one or more buttons that can be used to
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<BR>
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either start the scanning or cancel the scan process - at least when
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<BR>
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using the Windows driver.
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<BR>
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<P>I don't see a way to use the "Scan" button with the current implenentation
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<BR>
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of SANE: Even if I create a thread that checks the button status every
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second, I still can not communicate with the frontend and let it know
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that received a scan request via the button. The frontend would need to
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provide a callback function in order to do that. I guess the cancel
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button could be handled internally in the backend. The frontend does not
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need to know that the button was pressed, it should be sufficient to just
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stop sending data (and report some kind of error instead).
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<BR>
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<P>What we would need is a function that the frontend can call to find out
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<BR>
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how many buttons the scanner supports. In addition to that we would need
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to define a set of well known button "labels" so that the frontend could
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<BR>
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then register callback functions for e.g. "scan", "cancel", "fax", "email",
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... The backend would default to no callback for all buttons, so that the
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"button watching thread" would not start until at least one callback is
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registered.
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<P>My EPSON scanner has only one button, so this wold be a pretty simple
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implementation: Once the button is pressed the frontend would do the
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same thing as if the scan-button in the GUI would have been pressed.
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<BR>
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<P><P>What do you think?
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<BR>
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<P>Karl Heinz
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<BR>
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<P><PRE>
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--
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Karl Heinz Kremer <A HREF="mailto:khk@khk.net?Subject=Re:%20[khk@khk.net:%20Scanner%20Button%20Status%20/%20Is%20there%20anyting%20we%20can%20do%20with%20the%20buttons?]&In-Reply-To=<20000221175259.A7890@khk.net>">khk@khk.net</A>
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<A HREF="http://www.khk.net">http://www.khk.net</A>
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<P><P><P>----- End forwarded message -----
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<P>--
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Karl Heinz Kremer <A HREF="mailto:khk@khk.net?Subject=Re:%20[khk@khk.net:%20Scanner%20Button%20Status%20/%20Is%20there%20anyting%20we%20can%20do%20with%20the%20buttons?]&In-Reply-To=<20000221175259.A7890@khk.net>">khk@khk.net</A>
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<A HREF="http://www.khk.net">http://www.khk.net</A>
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<LI>application/pgp-signature attachment: <A HREF="att-0274/01-part">stored</A>
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<P><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?Subject=Re:%20[khk@khk.net:%20Scanner%20Button%20Status%20/%20Is%20there%20anyting%20we%20can%20do%20with%20the%20buttons?]&In-Reply-To=<20000221175259.A7890@khk.net>">majordomo@mostang.com</A>
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<LI><STRONG>Next message:</STRONG> <A HREF="0275.html">Cornelius, John: "Astra 1220S"</A>
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<LI><STRONG>Previous message:</STRONG> <A HREF="0273.html">Karl Heinz Kremer: "Re: Xsane-0.55: scan resolution selection (Epson 1200S, CVS Sane)"</A>
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<LI><STRONG>Next in thread:</STRONG> <A HREF="0277.html">Bill Thompson: "Re: [khk@khk.net: Scanner Button Status / Is there anyting we can do with the buttons?]"</A>
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<LI><STRONG>Reply:</STRONG> <A HREF="0277.html">Bill Thompson: "Re: [khk@khk.net: Scanner Button Status / Is there anyting we can do with the buttons?]"</A>
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This archive was generated by <A HREF="http://www.hypermail.org/">hypermail 2b29</A>
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: <EM>Mon Feb 21 2000 - 14:52:04 PST</EM>
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