creating .txt file from S function

Question

I have an C mex S function which can print output to the .txt file. This code inside mdlStart(SimStruct *S) creates datafile.txt file and appends the output.

  void** pwork = ssGetPWork(S);
  FILE *datafile;

  datafile = fopen("datafile.txt","a");
  pwork[0] =  datafile;

So now I want to dynamically get the filename of .txt file from user through S function mask . so , How can I receive string value of filename from mask inside S function.

score 1 · Accepted Answer · answered Oct 13 '15 at 19:15

1

First, yo will need to declare the mask parameter

the, you will need to pass the filename to SFunction parameter

Last, you will use the parameter inside the sfunction, like this:

 mxGetPr(ssGetSFcnParam(S,0));

See:

http://www.mathworks.com/help/simulink/sfg/ssgetsfcnparam.html http://www.mathworks.com/matlabcentral/answers/36028-integer-parameters-to-c-mex-s-function

answered Oct 13 '15 at 19:15

guilhermecgs

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I think to accept parameter from mask i.e array of char inside s function i need to use int mxGetString(const mxArray *pm, char *str, mwSize strlen); method ...Thanx for the help :) – redumpt Oct 14 '15 at 09:19
I didn't test the solution by myself, so you are probably correct. I just gave you the direction to follow. Let me know if it works. May the force be with you :-) – guilhermecgs Oct 14 '15 at 12:22
i followed your suggested procedure but to get parameter value i used mxGetString ....It's Working .Thanx for the help:) – redumpt Oct 14 '15 at 12:34

creating .txt file from S function

1 Answers1