Extract MATLABArray data return from Matlab dll in c# with new DATA API for dotnet

Question

Shaojun Xiao 2024-4-15

0
链接

此问题的直接链接

https://ww2.mathworks.cn/matlabcentral/answers/2107061-extract-matlabarray-data-return-from-matlab-dll-in-c-with-new-data-api-for-dotnet

回答： Aditya Saikumar 2024-7-11

Built a Matlab dll, a struct is returned from some calcuation of a matlab function.

In the old MWArray data API, I can access the data by extract and marshal it to MWNumericArray.

In the new DATA API for DotNet, I can get the field of the struct data but it is in the {MathWorks.MATLAB.Types.MATLABArray}, how can I extract this array data in C#.

5 个评论
显示 3更早的评论隐藏 3更早的评论

Shaojun Xiao 2024-5-8

Still unable to convert an array of user defined STRUCT back by the customer marshalling.

Shaojun Xiao 2024-5-9

public static object GetMatlabStructArrayObject(MATLABArray analysisResults, int index = 0)

{

TMConvertBinder bindercdb = new TMConvertBinder(typeof(MATLABStruct[]), true);

var dataReadcdb = analysisResults.TryConvert(bindercdb, out var datacdb);

if (dataReadcdb == true)

{

var tt = datacdb as MATLABStruct[];

if (tt!=null && tt.Length > index)

{

return tt[index];

}

return null;

}

请先登录，再进行评论。

请先登录，再回答此问题。

Answer 1

Aditya Saikumar 2024-7-11

0
链接

此回答的直接链接

https://ww2.mathworks.cn/matlabcentral/answers/2107061-extract-matlabarray-data-return-from-matlab-dll-in-c-with-new-data-api-for-dotnet#answer_1484138

在 MATLAB Online 中打开

To extract data out of "MathWorks.MATLAB.Types.MATLABArray", you can simply typecast it to the datatype you want. If the conversion is not possible, you will get an error. Consider the following example of a function which returns a struct containing a double, a string and a struct array:

MATLAB Script:

function outputStruct = getData()
% This function returns a MATLAB struct 'outputStruct'
% Output:
%   outputStruct - Struct containing a double field, a string 
%                  and a struct array.
outputStruct = struct();
% Use arguments block to map a MATLAB type to a C# type
% Struct arrays in MATLAB map to a MATLAB Data Array 
% MATLABStruct type in C#
arguments (Output)
outputStruct (1,1) struct
end
% fields
outputStruct.a = 1;
outputStruct.b = "hello";
% construct struct array
sArray = struct();
sArray.index = 1;
sArray.value = "one";
sArray(2).index = 2;
sArray(2).value = "two";
sArray(3).index = 3;
sArray(3).value = "three";
outputStruct.structArray = sArray;
end

C# code to extract data from the "getData()" result:

try
{
    string ctfPath = @"GetData.ctf";
        
    using (dynamic matlab = MATLABRuntime.StartMATLAB(ctfPath))
    {
        // call function
        MATLABFunctions.getData(matlab, out MATLABStruct outputStruct);
        // extract data
        double a = (double)outputStruct.GetField("a");
        string b = (string)outputStruct.GetField("b");
        dynamic s = (MATLABStruct[])outputStruct.GetField("structArray");
        
        // print the MATLABStruct elements
        Console.WriteLine((string)s[1].value);
    }
}
catch (Exception ex)
{
    Console.WriteLine($"An error occurred: {ex.Message}");
}