An asynchronous read and write their own written OPC class, which contains instructions for use, are welcome to download the test. I used in a sewage treatment project, there was no problem.

OPC
...\opccomn.h
...\opccomn_i.c
...\opcda.h
...\opcda_i.c
...\opcerrors.h
...\OPCRead.cpp
...\OPCRead.h
...\使用方法.txt

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Nothing．