The OPC-related links and brief description are listed below. There are some unable to add, I will update the content.
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http://www.kepware.comhttp://www.kepwarecn.com
Kepware has a program VB VC source code that can be applied directly.
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http://www.opcconnect.com
There is Delphi source code.
http://www.opcconnect.com/source.php#freesource
There is any source code address with all the developments.
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http://www.opcfoundation.org/http://www.opcchina.org
OPC Foundation ------ Official Stuff
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Industrial Control OPC Forum ------ The largest OPC Forum in China, a lot of master
Http://www.faWeb.net/us/opc/opclabs.html#opc_layeropc Cliet related code, simple application. VB simple and practical
Http://www.win-tech.com/ There is a fast, free development package, but it seems to be limited time, let you quickly understand the OPC.
? Development package on Server
Lightopc ............ an open source OPC Server server
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QQ group: 2868282 ?????? But everyone discussed is not too positive, but it is still no shortage.
