Convert MWCharArray to MWStructArray

Bonjour,

I have created a function in a Matlab DLL. I use this function, in C#, to create an output "Result" as MWArray. In C#, I transform easely "Result" to an an MWStructArray by MWStructArray Results_Bis = (MWStructArray)Result; this transformation works

Now, I modify my function. The output is not "Result" but "Result_JSon" an MWCharArray obtained by

Result_JSon = jsonencode(Result)

I try diffferent ways without success to create a same MWStructArray by using the new result "Result_JSon"

Can you please, help me ?

Thank you in advance

Best regards

Saïd Labrèche

sorry for my bad English

Answer 1

[SOUMNATH PAUL]

Hi,

To my understanding, you initially had a MATLAB DLL function providing an MWArray output named “Result” convertible to MWStructArray in C#. The function was later modified to yield “Result_JSon”, an MWCharArray which you obtained through JSON encoding. You want to convert the MWCharArray back into MWStructArray format in C#.

You can follow below mentioned steps for the proper conversion:

1. Update MATLAB Function: Make sure your MATLAB function now generates a JSON string(‘Result_JSon’) using the ‘jsonencode’ function.
2. Install Newtonsoft.Json: In your C# project, install the Newtonsoft.Json library using Nuget Package Manager.
3. De-serialize JSON String: Deserialize the JSON string(‘Result_JSon’) into a C# object using a nifty tool from Newtonsoft.Json.
4. Convert to MWStructArray: Create a function to convert fields of the C# object to correct MWArray types and field names.

using MathWorks.MATLAB.NET.Arrays; 

using Newtonsoft.Json; 

 

MWArray Result; 

MWCharArray Result_JSon = (MWCharArray)yourMatlabFunctionCall(); 

 

// Step 1: Convert MWCharArray to C# string 

string jsonString = Result_JSon.ToString(); 

 

// Step 2: Deserialize JSON string into C# object 

YourCSharpObjectType resultObject = JsonConvert.DeserializeObject<YourCSharpObjectType>(jsonString); 

 

// Step 3: Convert C# object to MWStructArray 

MWStructArray Results_Bis = ConvertToMWStructArray(resultObject); 

 

// Your ConvertToMWStructArray function 

MWStructArray ConvertToMWStructArray(YourCSharpObjectType resultObject) 

{ 

    // Create a new MWStructArray 

    MWStructArray mwStructArray = new MWStructArray(1, 1); 

 

    // Customize the following based on your actual field names 

    // For each field, convert the C# value to the appropriate MWArray type 

    mwStructArray["FieldName1"] = new MWNumericArray(resultObject.Field1); 

    mwStructArray["FieldName2"] = new MWCharArray(resultObject.Field2); 

    // ... 

 

    return mwStructArray; 

} 

You can find more information in the following link:

https://www.mathworks.com/help/dotnetbuilder/MWArrayAPI/html/N_MathWorks_MATLAB_NET_Arrays.htm

Hope it helps!

Regards,

Soumanth