matlab无法定义块,在simulink中运行用户定义的块时，Matlab崩溃

我在simulink中用单输入和单输出创建了一个用户定义的块，它工作得很好 . 但是当我在没有输入的情况下创建用户定义的块时，在simulink模型MATLAB Crashes中运行此块 . 下面是C S函数的代码 .

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#define S_FUNCTION_NAME My5times /* Defines and Includes */

#define S_FUNCTION_LEVEL 2

#include "simstruc.h"

static void mdlInitializeSizes(SimStruct *S)

{

ssSetNumSFcnParams(S, 2);

if (ssGetNumSFcnParams(S) != ssGetSFcnParamsCount(S))

{

return; /* Parameter mismatch reported by the Simulink engine*/

}

if (!ssSetNumInputPorts(S, 0))

return;

ssSetInputPortWidth(S, 0, DYNAMICALLY_SIZED);

ssSetInputPortDirectFeedThrough(S, 0, 0);

if (!ssSetNumOutputPorts(S,1))

return;

ssSetOutputPortWidth(S, 0, DYNAMICALLY_SIZED);

ssSetNumSampleTimes(S, 1);

/* Take care when specifying exception free code - see sfuntmpl.doc */

ssSetOptions(S, SS_OPTION_EXCEPTION_FREE_CODE);

}

static void mdlInitializeSampleTimes(SimStruct *S)

{

ssSetSampleTime(S, 0, INHERITED_SAMPLE_TIME);

ssSetOffsetTime(S, 0, 0.0);

}

static void mdlOutputs(SimStruct *S, int_T tid)

{

int_T i;

/*int_T param = mxGetScalar(ssGetSFcnParam(S,0));*/

int_T buflen = mxGetN(ssGetSFcnParam(S, 0)) * sizeof(mxChar) + 1;

char_T* StringParam = mxMalloc(buflen);

int_T status = mxGetString(ssGetSFcnParam(S, 0), StringParam, buflen);

/* mexPrintf("The string being passed as a Paramater is - %sn ", String);*/

/* InputRealPtrsType uPtrs = ssGetInputPortRealSignalPtrs(S, 0);*/

real_T *y = ssGetOutputPortRealSignal(S, 0);

int_T width = ssGetOutputPortWidth(S, 0);

for (i = 0 ; i < width ; i++)

{

*y++ = 1;

}

}

static void mdlTerminate(SimStruct *S){}

#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