Convert String to instrument​.Oscillosc​opeObject

I am using MATLAB function in C#. I am trying to get back the value of myScope in C# so that I can use it later on, but the type of myScope is instrument.Oscilloscope which is not recognized by C# and it displays 'null' in result. If I send back the myScope value to C# as string (which I can do) but late on (in code) I have to send it back to Matlab and obviously as "instrument.Oscilloscope" . Is there some way of converting string to instrument.Oscilloscope.

// Create the MATLAB instance 
        MLApp.MLApp matlab = new MLApp.MLApp();
    // Change to the directory where the function is located 
    matlab.Execute(@"cd c:\MATLABcodevisualstudio");

      // Define the output 
      object result = null;

      try {

          // Call the MATLAB function myfunc

          matlab.Feval("ConfigureScope", 1, out result, "2", "100", "USB::0x0699::0x0367::C057105::INSTR", "CH1", "CH2", "normal", "Falling", "1"); //working

      }

      catch (InvalidOperationException ex)
      {
          Console.WriteLine(ex.GetType().FullName);
          Console.WriteLine(ex.Message);
      }

      // Display result 
      object[] res = result as object[]; 

%%%%%%%%%%%%%%%%%%Matlab func
function [myScope]= ConfigureScope(ResourceAddress, AcquiringChannel, TriggeringChannel,TriggerMode, TriggerSlope, TriggerLevel)

      % Instantiate an instance of the scope.
      myScope = oscilloscope();

      % Find resources. 
      availableResources = getResources(myScope); 

     %connect to availble resources
      myScope.Resource = ResourceAddress;

      % Connect to the scope.
      connect(myScope);  

      % Enable channel 1. 
      enableChannel(myScope, AcquiringChannel);

      % Set the trigger mode to normal. 
      set(myScope, 'TriggerMode', TriggerMode);
      set(myScope, 'TriggerSlope', TriggerSlope);
      set(myScope, 'TriggerSource', TriggeringChannel);
      set(myScope, 'TriggerLevel', str2double(TriggerLevel));
      myScope

Answer 1

[Guillaume]

I'm not sure you can pass objects through matlab COM interface. Why don't you use Execute instead of Feval to create the oscilloscope in the matlab workspace. You can then use more Execute to manipulate that oscilloscope and GetVariable or GetFullMatrix to get at the variables of interest.

[Ayle]

how to use execute instead of Feval?? I am already using execute ( matlab.Execute(@"cd c:\MATLABcodevisualstudio");). Can you please point to some example code?

[Ayle]

Oh you mean to use it like this?? https://www.codeproject.com/Articles/5468/1-2-3-ways-of-integrating-MATLAB-with-the-NET

Will it return the required values. I mean in C# will it recognize the type instrument.oscilloscope

let me try if ti work

[Guillaume]

I mean instead of Feval you'd do something like:

matlab.Execute(string.Format("myscope = ConfigureScope(%d, %d, %s, %s, %s, %s, %s, %d);", 2, 100, "USB::0x0699::0x0367::C057105::INSTR", "CH1", "CH2", "normal", "Falling", 1);

Basically, instead of transferring the object between C# and matlab (which I don't think you can do anyway), keep the object in the matlab workspace.

You can then use that matlab variable with more Execute:

matlab.Execute("connect(myscope)");

If you need to transfer data between matlab and C# then you can use GetWorkspaceData and PutWorkspaceData to get at the variables in matlab workspace.

[Ayle]

That solved my problem:) thanks One more question; using this matlab.execute works sequentially with c# code or is the command running in parallel in Matlab?

[Guillaume]

Execute waits until the command is completed since it must collect its output (if any). So it is sequential (unless you specifically design the matlab command to be asynchronous which would require the parallel processing toolbox or some fancy delegating to Java, mex, or .Net from the matlab side).