OPC asynchronous read data class package. The opc initialization, asynchronous read, synchronous read, write, and stop functions encapsulated into classes. Was time to use vc6 to create a project, and then compress the files in the root directory into the project, include header file can be used after.

opc\Callback.cpp
...\Callback.h
...\defineVar.h
...\OpcAsyEncapsu.cpp
...\OpcAsyEncapsu.h
...\pre_opc.cpp
...\pre_opc.h
...\resource.h
...\StdAfx.cpp
...\StdAfx.h
opc

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