How can i pass a matlab struct variable into a C MEX S function as an input argument?

as titled, if it is possible? many thanks.

Answer 1

[Aditya Singh]

Hi,

To my understanding you need to pass MATLAB struct to MEX function.

You can do it by calling the C function with a MATLAB StructArray.

st.Name = 'Color';
st.Value = uint8([1 0 1]);
result = myMexFcn(st);

Assign input of MATLAB type struct in the MEX function.

matlab::data::StructArray inStructArray = inputs[0];

and return output to be of type struct in MATLAB.

For more information you can refer to:

Data Types for Passing MEX Function Data - MATLAB & Simulink - MathWorks India

Pass Structures and Cell Arrays in C MEX File - MATLAB & Simulink - MathWorks India

C MEX S-Function Examples - MATLAB & Simulink - MathWorks India

Hope it helps

[Xiangjun]

Thanks Aditya,

My question is about C MEX S function in simulink module, not C MEX function. I don't think they are same. am i right?

Thanks anyway.

Regards,

Xiangjun

[Aditya Singh]

You can refer to How to pass a structure parameter in simulink mask to C mex S-Function? - MATLAB Answers - MATLAB Central (mathworks.com) and see if it helps.