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Newsgroups: comp.lang.ada
Date: Thu, 27 Oct 2016 14:08:38 -0700 (PDT)
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Subject: Re: Scanner library Ada binding?
From: Stephen Leake <stephen_leake@stephe-leake.org>
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Xref: news.eternal-september.org comp.lang.ada:32184
Date: 2016-10-27T14:08:38-07:00
List-Id: <comp.lang.ada>

On Sunday, September 18, 2016 at 3:25:58 PM UTC-5, Stephen Leake wrote:
> I'm scanning all the liner notes from my CDs (several hundred).
...
> Does anyone have an Ada binding to the Windows TWAIN interface? I'm on 64=
 bit=20
> Windows 8.1, GNAT GPL 2016 (32 bit).

I ended up implementing a Windows Metro app, starting from a scanner sample=
 app provided with Microsoft Visual Studio.

It was a frustrating experience. The sample code uses C++ syntax that I cou=
ld not find definitions for (I think "^" is some variant of pointer). The M=
icrosoft code documentation makes the Google Android docs look wonderful :(=
. There appear to be at least 2 separate sets of code; those for a Metro ap=
p (called "the Windows Runtime") and those for a Desktop app (not clear wha=
t that runtime is called). And no way to limit searches to one or the other=
!

The low-level scan routines only return .BMP files. The only example code I=
 could find that would convert that to JPEG was for the Desktop runtime (th=
e scan example is for the Metro runtime). I already have some Desktop Ada c=
ode that incorporates the JPEG files into a PDF via latex, so I added more =
Ada code to call ImageMagick 'convert' via GNAT.OS_Lib.

It works, and it will save time, but what a pain!