An open source OPC DA Client SDK/ToolKit written in C++, support both 32 bit and 64 bit.
This release contains a huge bug fixes commit from PR#14, which might introduce some new bugs. If it went wrong, you may check release 0.4.1 as a backup.
The x64 version has some address corruption problem when you are using VS2012 or later, you can open "Project Property -> Linker -> CommandLine", then add /HIGHENTROPYVA:NO to avoid this issue