Call C/C++ Code from MATLAB Code

I am trying to implement the following example:

Integrate External Code that Uses Custom Data Types

This example shows how to call a C function that uses data types that are not natively defined within MATLAB®.

consider the MATLAB function addCTypes.m:

function [out] = addCTypes(a,b)
%#codegen
% generate include statements for header files
coder.cinclude('MyStruct.h');
coder.cinclude('createStruct.h');
coder.cinclude('useStruct.h');
% initialize variables before use
in = coder.opaque('MyStruct');
out = 0;
% call C functions
in = coder.ceval('createStruct',a,b);
out = coder.ceval('useStruct',in); 
end

The createStruct function outputs a C structure type:

#include <stdio.h>
#include <stdlib.h>
#include "MyStruct.h"
#include "createStruct.h"

struct MyStruct createStruct(double a, double b) {
    struct MyStruct out;
    out.p1 = a;
    out.p2 = b;
    return out;
}

The useStruct function performs an operation on the C type:

#include "MyStruct.h"
#include "useStruct.h"

double useStruct(struct MyStruct in) {
    return in.p1 + in.p2;
}

To generate code, specify the source (.c) files as inputs:

codegen addCTypes -args {1,2} -report createStruct.c useStruct.c

and I get the follwong result:

------------------------------------------------------------------------
??? Build error: C compiler produced errors. See the Build Log for further details.
More information
Code generation failed: View Error Report

Error using codegen


Error in run (line 1)
codegen addCTypes -args {1,2} -report createStruct.c useStruct.c

should I make a file 'MyStruct.h', and how I should define it ?

Answer 1

[James Tursa]

If your code includes a file called MyStruct.h, then yes you should have such a file. I would expect it to be something like this:

/* File:  MyStruct.h */
struct MyStruct {
double p1;
double p2;
};

You need the other header files also. These files need to be in a directory that is visible to the compiler when it sees the #include lines.

[Tareg Mohammed]

I included all relavent files in same directory, with MyStruct.h. and it still shows the following error.