NotImplementedException

Hi,

I try to use this library instead an old libPLCTagWrapper that I have in one of our project. I downloaded the nuget and implement the method but I run a NotImplementedException on the NativeTagWrapper.coreLibEventCallback

I tried to find what’s wrong in the the source code, and it seems that the Event catched is not in the switch case of the method.

void coreLibEventCallback(int eventTagHandle, int eventCode, int statusCode)
        {

            var @event = (Event)eventCode;
            var status = (Status)statusCode;
            var eventArgs = new TagEventArgs() { Status = status };

            switch (@event)
            {
                case Event.ReadCompleted:
                    ReadCompleted?.Invoke(this, eventArgs);
                    break;
                case Event.ReadStarted:
                    ReadStarted?.Invoke(this, eventArgs);
                    break;
                case Event.WriteStarted:
                    WriteStarted?.Invoke(this, eventArgs);
                    break;
                case Event.WriteCompleted:
                    WriteCompleted?.Invoke(this, eventArgs);
                    break;
                case Event.Aborted:
                    Aborted?.Invoke(this, eventArgs);
                    break;
                case Event.Destroyed:
                    Destroyed?.Invoke(this, eventArgs);
                    break;
                case Event.Created:
                    Created?.Invoke(this, eventArgs);
                    break;
                default:
                    throw new NotImplementedException();
            }
        }

Maybe my implementation is not correct, find my code below. I run on VS 2019 and in .net framework 4.7.2

var myTag1 = new Tag<RealPlcMapper, float>()
  {
  Name = "testtag[0].myTag", //also tried with a tag like "testtag"
  Gateway = "192.0.0.0",
  Path = "1,0",
  PlcType = PlcType.ControlLogix,
  Protocol = Protocol.ab_eip,
  Timeout = TimeSpan.FromSeconds(5)
  };
  
  
  myTag1.Initialize();
  //Write value to PLC
  //This will call Initialize internally since it's the first use of this tag
  //myTag.Value = 3.75;
  //myTag.Write();
  rtxtABAnswer.Text += $"Write myTag" + Environment.NewLine;
  //Read value from PLC
  //Value will also be accessible at myTag.Value
  myTag1.Read() ;
  var result = myTag1.Value;
  rtxtABAnswer.Text += $"myTag value {result}" + Environment.NewLine;

I also tried to get all the project with example, compile it and run it on the computer who have access to the PLC but it did not work I have a message “Windows cannot access peripheric, file or path access” …

Thanks for your help

[johncharris]

There was a new version of the libplctag C library released recently that causes a NotImplementedException . By downloading the dll for 2.5.0 and not using the NativeImport package I was able to get it working. @timyhac posted the link earlier. https://github.com/libplctag/libplctag.NET#developing-for-systems-with-immutable-application-directories

[Kevin138]

I rolled back to NativeImport v1.0.30 (from 1.0.33). Seems to have solved my issue.