mzillgith / OPC-Client-X64

An open source OPC DA Client SDK/ToolKit written in C++, support both 32 bit and 64 bit.

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An object oriented OPC DA Client SDK/ToolKit written in C++, Both X86/X64 supported, implementing the OPC DA specification version 2.05A

Known Issues

  • 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, See Issue#1 for more detail

Detail & ChangeLog

  • Date: 2017-04-13

    • Fix a string conversion bug which might lead stack overflow
    • Add a convenience class to connect local server in sync I/O mode
     	// connect local server
     	LocalSyncOPCCLient* client = new LocalSyncOPCCLient;
     	if (client->Connect("Matrikon.OPC.Simulation.1"))
     		// sync write and sync read
     		client->WriteUint16("Bucket Brigade.UInt2", 998);
     		std::cout << client->ReadUint16("Bucket Brigade.UInt2");
     		// disconnect and stop
     		delete client;
    • You could rewrite or override the member function IsOPCConnectedPLC() to make connection more safety
    • You could rewrite or override the member function ItemNameFilter(std::string) to avoid adding useless items
    • Since there are too many Variant type, I only add three basic I/O functions as a guidence, it should help you to add what you need
  • Date:2016-12-13

    • Thanks for Tom Loya's contribution, now the project can work in a multi-threaded environment. You should call COPCClient::init() and COPCClient::stop() in every thread.
  • Date:2016-07-01

    • this std branch tries to move every ATL to STL.
    • the static .lib now works for MFC too.
  • Date:2016-05-31

    • Modified from X86 Version OPC Client 0.4a by beharrell
    • Add some Hint info
    • X64 Version uses includes files form OPC Core Component 3.0.106.
      • Install OPC Core Component is NECESSARY, I bundled the version (seems more popular).
    • Tested with MatrikonOPC Simulation Server
      • You can get it free at offical site after reg.
      • Start OPC Simulation Server, then build project. Run the demo, input hostname, then input server ID, it should work.
    • I advice you to use hostname instead of IP address for reasons below.
      • If you want to access OPC by IP, you have to enable RemoteRegistry service in services.msc
      • Also , for UAC problem after Vista, your program must run as admin to avoid some issue.


An open source OPC DA Client SDK/ToolKit written in C++, support both 32 bit and 64 bit.

License:GNU Lesser General Public License v3.0


Language:C++ 95.8%Language:C 4.0%Language:Objective-C 0.1%