Access Violation Error when run Matlab compiled function from C#

Hi all,

I have a problem with calling Matlab function from C#. When I am calling Matlab function, the Access Violation Error (0x00000005) occurs.

Simple Matlab function was created:

function fcnHelloStrIn(str)

fprintf(sprintf('Hello world ... %s\n\n', (str)));

A dll library incorporating this function was created by Matlab compiler (4.17)

bool MW_CALL_CONV mlxFcnHelloStrIn(int nlhs, mxArray *plhs[], int nrhs, mxArray *prhs[]);

I tried to implement simple C# wrapper as follows (only relevant lines of code are included)

...

// ----- DLL import -----

[DllImport("HelloDll.dll", CallingConvention = CallingConvention.Cdecl, CharSet = CharSet.Auto)]

public static extern bool mlxFcnHelloStrIn([In] int nlhs, ref IntPtr outParams, [In] int nrhs, [In] IntPtr inParams);

...

MCR and Dll initialization function // OK

...

// ----- Main part -----

IntPtr outputPtr = IntPtr.Zero;

IntPtr stringPtr = IntPtr.Zero;

string helloString = "Hello world!";

stringPtr = mxCreateString(helloString);

bool result = mlxFcnHelloStrIn(0, ref outputPtr, 1, stringPtr);

....

When I call the function mlxFcnHelloStrIn then the access violation error (0xc0000005) arise. Does anybody know how to fix this issue?

Thanks in advance

Martin

[Preetha Joy]

Are you able to solve this ? I am also facing the same issue