I cannot run this file-io-c-s-function?

https://www.mathworks.in/matlabcentral/fileexchange/13438-file-io-c-s-function-example

If i run this model, i got the following error, ==> mex at 222 Unalble to complete successfully

Can anyone help me for the reason...

[Kaustubha Govind]

How did you run the "mex" command?

[Ravi]

just i created a model..

/* Give S-function a name */
#define S_FUNCTION_NAME  cfileiosfun
#define S_FUNCTION_LEVEL 2

/* Include SimStruct definition and file I/O functions */
#include "simstruc.h"
#include <stdio.h>

/* Called at the beginning of the simulation */
static void mdlInitializeSizes(SimStruct *S)
{

      ssSetNumSFcnParams(S, 0); 
      if (ssGetNumSFcnParams(S) != ssGetSFcnParamsCount(S)) {
          return;
      }

      ssSetNumContStates(S, 0);
      ssSetNumDiscStates(S, 0);

      if (!ssSetNumInputPorts(S, 0)) return;
      if (!ssSetNumOutputPorts(S, 1)) return;
      ssSetOutputPortWidth(S, 0, 1);
      ssSetOutputPortDataType(S,0,SS_SINGLE);

      ssSetNumPWork(S,1);
      ssSetNumSampleTimes(S, 1);
  }

/* Set sample times for the block */
static void mdlInitializeSampleTimes(SimStruct *S)
{
    ssSetSampleTime(S, 0, 1.0);
    ssSetOffsetTime(S, 0, 0.0);
}

#define MDL_START  /* Change to #undef to remove function */
#if defined(MDL_START) 
  /* Function: mdlStart =======================================================
   * Abstract:
   *    This function is called once at start of model execution. If you
   *    have states that should be initialized once, this is the place
   *    to do it.
   */
  static void mdlStart(SimStruct *S)
  {
      /*at start of model execution, open the file and store the pointer
       *in the pwork vector */
      void** pwork = ssGetPWork(S);
      FILE *datafile;

        datafile = fopen("datafile.dat","r");
        pwork[0] =  datafile;

    }
  #endif /*  MDL_START */

/* Function: mdlOutputs =======================================================
 * Abstract:
 *    In this function, you compute the outputs of your S-function
 *    block. Generally outputs are placed in the output vector, ssGetY(S).
 */
static void mdlOutputs(SimStruct *S, int_T tid)
{
    //get pointer to the block's output signal
    real_T       *y = ssGetOutputPortSignal(S,0);

      /*get pointer to array of pointers, where the first element is the address
       *of the open file */
      void** pwork = ssGetPWork(S);

      /*read a floating point number and then the comma delimiter
       *store the result in y*/
      fscanf(pwork[0],"%f%*c",y);
  }

/* Function: mdlTerminate =====================================================
 * Abstract:
 *    In this function, you should perform any actions that are necessary
 *    at the termination of a simulation.  For example, if memory was
 *    allocated in mdlStart, this is the place to free it.
 */
static void mdlTerminate(SimStruct *S)
{
    //close the file
    void** pwork = ssGetPWork(S);
      FILE *datafile;

        datafile = pwork[0];
        fclose(datafile);

}

/*=============================*
 * Required S-function trailer *
 *=============================*/

#ifdef  MATLAB_MEX_FILE    /* Is this file being compiled as a MEX-file? */
#include "simulink.c"      /* MEX-file interface mechanism */
#else
#include "cg_sfun.h"       /* Code generation registration function */
#endif

this is the code... this code i have written in s-finction... but the thing is i have given the name iosfun to that s-function but it is showing the above error that iosfun doesn't exist

[Walter Roberson]

You did not show us the log of the error; you just showed that it said the mex did not complete.

Did you use

mex -setup

to choose a compiler? Which compiler did you choose, which OS are you on, which MATLAB version are you using, and are you using 32 or 64 bit MATLAB?

[Ravi]

Walter Roberson : i tried with Lcc-win32, My OS: Windows Xp, MATLAB 7.10.0 (R2010a)(32-bit)

after mex -setup >> mex cfileiosfun.c

then i am getting following error D:programfiles\MATLAB\R2010a\bin\mex.pl: Error: 'cfileiosfun.c' not found

Error using ==> mex at 222 unable to complete successfully

then what to do... Can u explain

Thanks in advance Ravi Kiran

[Kaustubha Govind]

Is the file cfileiosfun.c in your current working directory in MATLAB?

[Ravi]

yes it is in currennt directory

[Ravi]

thank you Kaustubha Govind & Walter Roberson with your comments & my implemenntation it finally worked.. this is my first attempt using s-functions.. Thanks 4 ur support... hav a nice dayy....

[Ravi]

The model is working well for a textfile with 100 values in it.. But for my project since it is real time, my text file will contain around 70000 values.. So when i am running the model with >1000 or something... MATLAB is Closing reporting that it is not responding.... So what to do now... Can u explain..

[Kaustubha Govind]

Ravi: Please set breakpoints in your code and narrow down the issue to a line of code where it always crashes. You are not providing enough information for us to be able to help.