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How to throw an exception when using MATLAB C or C++ API

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I have a C++ code, which is like:
mexFunction(int nlhs, mxArray *plhs[], int nrhs, const mxArray *prhs[])
{
try{
// Here is my code
}catch(...){
mexErrMsgTxt("Something Wrong");
}
}
After mex the code, I want to get "Something Wrong" in MTALAB window if any exception was throwed from the "try" part.
However, if there do some errors in the code (inside the try curly bracket), it will crush my MATLAB like
The try-catch seems ineffective in this stuation. So how to throw an exception from C++ to MATLAB if anything wrong?

Accepted Answer

Aiswarya
Aiswarya on 3 Oct 2023
Hi,
I understand that you are trying to throw an exception from C++ to MATLAB after converting the code to a MEX function.
This displays the error in the MATLAB command window.
You may refer to a C++ example code (mexcpp.cpp) which implements error handling by running the following command in the MATLAB Command Window:
edit([matlabroot '/extern/examples/mex/mexcpp.cpp']);
  1 Comment
Ziyu Hua
Ziyu Hua on 9 Oct 2023
Thanks, I re-compile the code below like this and it seems to be fine.
#include"mex.h"
void mexFunction(int nlhs, mxArray* plhs[], int nrhs, const mxArray* prhs[])
{
try {
// Here is my code
throw(1);
}
catch (...) {
mexErrMsgIdAndTxt("error","Something Wrong");
}
}
The output of the MATLAB is an error message.
I can't remember what particular problems I once met, but it seems that they have been resolved.
Thanks.

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