How do I properly call this function in my MATLAB Coder-generated dll?

I am currently working on a simulation which I have compiled into a dll using Matlab Coder. Now I want to test if the dll is working fine but I cannot access the compiled function using calllib. A part of this function is to load an object from a .mat file which contains all the simulation properties and methods, minus the input of course. The executing script is:

fullpathToHeader = 'headerpath\function_Sim.h';

fullpathToDll = 'dll_path\library_Sim.dll';

[notfound,warnings] = loadlibrary(fullpathToDll, fullpathToHeader);

dt = 1;

t0 = -5;

t_end = 20;

timer = t0:dt:t_end;

t = t0;

F_com = 1e10;

M0 = 3;

h0 = 1e4;

alpha = 5;

beta = 1;

status_PCA = 2;

status_KV = 2;

output = calllib('library_Sim','function_Sim', double(dt), ...

double(t0), ...

double(t_end), ...

double(F_com), ...

double(M0), ...,

double(h0), ...

double(alpha), ...

double(beta), ...

double(status_PCA), ...

double(status_KV))

And the error I get is:

>>"Error using calllib

No method with matching signature.

Error in test_dll (line 51)

output = calllib('library_Sim','function_Sim', double(dt), ...<<

I initially thought I had to clearly define the input types (which is why everything has double() around it) but that made 0 difference.

The header file generated for the function I am trying to call looks as follows:

/*

* function_Sim.h

*

* Code generation for function 'function_Sim'

*

*/

#ifndef FUNCTION_SIM_H

#define FUNCTION_SIM_H

/* Include files */

#include "function_Sim_types.h"

#include "rtwtypes.h"

#include <stddef.h>

#include <stdlib.h>

#ifdef __cplusplus

extern "C" {

#endif

/* Function Declarations */

extern void function_Sim(double dt, double t0, double t_end, double F_com,

double M0, double h0, double alpha, double beta, double status_PCA, double

status_KV, emxArray_real_T *out);

#ifdef __cplusplus

}

#endif

#endif

/* End of code generation (function_Sim.h) */

I have tried to enter the inputs directly instead of variables, I had packaged them all into a struct at one point, I had the same issue. What am I overlooking here?

Answer 1

[Richard McCormack]

Hi Jan,

Using loadlibrary on a dll generated through MATLAB Coder is not supported (see the limitations here):

https://www.mathworks.com/help/matlab/ref/loadlibrary.html#btdlak_-2

For testing, you can use MEX generation and call your code from MATLAB that way.

For more verification options, please review our documentation here:

https://www.mathworks.com/help/ecoder/verification.html

In particular, "Software-in-the-Loop Execution with the MATLAB Coder App" may be helpful.

Best,

Richard

[Jan Sailer]

Ah I see, I'll try that instead. Thank you for the fast response.