Why am I unable to use the PRINTF function from the standard C libraries inside the wrapper code of my C-MEX S-function?

MathWorks Support Team

2009 6 27

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If I use the PRINTF function in my C-MEX S-function it works fine. But if I use this in some wrapper code that is called from my S-function, this function does not work. I have "#included" the standard "stdio.h" library but still have this problem.

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MathWorks Support Team 2009-6-27

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You cannot use PRINTF in wrapper function code. Try using "ssPrintf" which is defined in the simstruc.h file. This will expand to 'mexPrintf' for simulation and 'printf' for real-time code. See "Writing S-functions Guide" page 10-118 for details on this macro.

You should also #include the simstruc.h file in your wrapper code when using "ssPrintf".