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<TITLE>sane-devel: Re: How to support a scanner without documentation</TITLE>
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<META NAME="Author" CONTENT="Jochen Eisinger (jochen.eisinger@gmx.net)">
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<META NAME="Subject" CONTENT="Re: How to support a scanner without documentation">
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<H1>Re: How to support a scanner without documentation</H1>
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<STRONG>From:</STRONG> Jochen Eisinger (<A HREF="mailto:jochen.eisinger@gmx.net?Subject=Re:%20How%20to%20support%20a%20scanner%20without%20documentation&In-Reply-To=<394F2FED.3A6ED745@gmx.net>"><EM>jochen.eisinger@gmx.net</EM></A>)<BR>
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<STRONG>Date:</STRONG> Tue Jun 20 2000 - 01:48:45 PDT
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<LI><STRONG>Next message:</STRONG> <A HREF="0165.html">Henning Meier-Geinitz: "Re: Towards release 1.0.3?"</A>
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<LI><STRONG>Previous message:</STRONG> <A HREF="0163.html">Jochen Eisinger: "Re: New Mustek PP backend using sanei_pa4s2"</A>
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<LI><STRONG>In reply to:</STRONG> <A HREF="0134.html">Henning Meier-Geinitz: "How to support a scanner without documentation"</A>
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<LI><STRONG>Next in thread:</STRONG> <A HREF="0167.html">Nathan Stenzel: "Re: How to support a scanner without documentation"</A>
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<LI><STRONG>Reply:</STRONG> <A HREF="0167.html">Nathan Stenzel: "Re: How to support a scanner without documentation"</A>
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<P>
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Hi,
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<BR>
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<EM>>
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</EM><BR>
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<EM>> 5) Disassembling the Windows driver: I have never done this, other people
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</EM><BR>
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<EM>> on this list may talk about this. I think it's a lot of work and needs
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</EM><BR>
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<EM>> good understatement of assembler and the windows API.
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</EM><BR>
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<P>I've done this with a Mustek PP driver...
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<BR>
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<P>There are several files in the windows/twain/a4s2/ directory. The only
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<BR>
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interesting file was scanobj.dll: this file calls a a4sii300.386 (VxD).
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<BR>
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scanobj.dll is quite easy to read, there are several functions like
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<BR>
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PowerOn/Off, GetDeviceInfo, Start/StopScan, GetImage, SetParameters,
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<BR>
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etc... I used this information for a) figuring out what parameters the
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<BR>
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vxd driver needs and b) what vxd function no is supposed to do. Next I
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<BR>
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disassembled the vxd and translated the assembler code to C code which
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<BR>
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is quite straight forward. Now comes the difficult part. You have to
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<BR>
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replace names like sub9CF or var65535_word with names like lock_port and
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<BR>
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image_width. This is quite difficult, but it's possible. Now you have
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<BR>
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the sources of a working scanner driver...
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<BR>
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<P>-- jochen
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<BR>
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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:%20How%20to%20support%20a%20scanner%20without%20documentation&In-Reply-To=<394F2FED.3A6ED745@gmx.net>">majordomo@mostang.com</A>
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</PRE>
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<LI><STRONG>Next message:</STRONG> <A HREF="0165.html">Henning Meier-Geinitz: "Re: Towards release 1.0.3?"</A>
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<LI><STRONG>Previous message:</STRONG> <A HREF="0163.html">Jochen Eisinger: "Re: New Mustek PP backend using sanei_pa4s2"</A>
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<LI><STRONG>In reply to:</STRONG> <A HREF="0134.html">Henning Meier-Geinitz: "How to support a scanner without documentation"</A>
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<LI><STRONG>Next in thread:</STRONG> <A HREF="0167.html">Nathan Stenzel: "Re: How to support a scanner without documentation"</A>
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<EM>
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This archive was generated by <A HREF="http://www.hypermail.org/">hypermail 2b29</A>
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: <EM>Thu Jun 22 2000 - 09:56:59 PDT</EM>
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