Using Feval from C# - handling returned struct

Question

Jeremy Howard-Baynham 2018-5-29

0
链接

此问题的直接链接

https://ww2.mathworks.cn/matlabcentral/answers/403006-using-feval-from-c-handling-returned-struct

评论： javid akhavan 2020-1-17

Using the sample code on the website I can call a simple function successfully, but where the returned type is a struct, all I get back is a null, but with no error.

Sample function:

function out = myfunc(y)
out.mean = mean(y); % mean
out.median = median(y); % median
out.std = std(y); % standard deviation
end

My C# code:

static void Main(string[] args)
        {
            MLApp.MLApp matlab = new MLApp.MLApp();
              matlab.Execute(@"cd c:\BF_hctsa\Operations");
              object result = null;
              System.Array input = new double[10];
              for (int i = 0; i < 10; i++)
              {
                  input.SetValue(1.0, i);
              }
              matlab.Feval("myfunc", 1, out result, input);
              object[] res = result as object[];
              Console.WriteLine(res[0]);
              Console.ReadLine();
          }

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Answer 1

Preethi Ayyamperumal 2018-6-6

0
链接

此回答的直接链接

https://ww2.mathworks.cn/matlabcentral/answers/403006-using-feval-from-c-handling-returned-struct#answer_323475

MATLAB does not support the following COM interface types:

Structure
Sparse array
Multidimensional SAFEARRAYs (greater than two dimensions)
Write-only properties

The workaround is to return fields of the desired struct from the MATLAB function when using Feval. Please refer to the updated code below:

MATLAB Code:

function [out.mean,out.median,out.std] = myfunc(y)
out.mean = mean(y); % mean
out.median = median(y); % median
out.std = std(y); % standard deviation
end

C# code

static void Main(string[] args)
  {
  MLApp.MLApp matlab = new MLApp.MLApp();
  matlab.Execute(@"cd c:\BF_hctsa\Operations");
  object result = null;
  System.Array input = new double[10];
  for (int i = 0; i < 10; i++)
      input.SetValue(1.0, i);
  matlab.Feval("myfunc", 3, out result, input);
  object[] res = result as object[];
  Console.WriteLine(res[0]);
  Console.WriteLine(res[1]);
  Console.WriteLine(res[2]);
  Console.ReadLine();
 }