>From: Famory TOURE <Famory.ToureALCATEL.FR>
>If you are an OPC foundation member, you can obtain a free version of an
>OPC Data Server (1.0) written by Al Chisholm from Intellution. However,
>this server is very old (written in 1996) and is written in pure COM (no
>ATL).

Another free one is from Lab43. This is what www.opcconnect.com says about
the package:

>>Lab43's LightOPC is an open source OPC server toolkit, produced by a
>> >>group of Russian academics and released under the GNU LGPL license.

>>Contrary to its name, LightOPC is a comprehensive piece of work. Its
>> >>development is ongoing, and most of the limitations of earlier
>> >>revisions have now been removed

I tried it in a recent project and it worked flawlessly! It implements OPC
Data Access V1 & V2.
(one warning tho: it doesn't use ATL either...)

http://www.ipi.ac.ru/lab43/lopc-en.html

Marcus

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