Determine Path of Mex S function from the C/C++ mex code

Question

Ben 2013-5-9

1
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https://ww2.mathworks.cn/matlabcentral/answers/75230-determine-path-of-mex-s-function-from-the-c-c-mex-code

回答： Graham Fletcher 2020-2-17

I have a C++ level 2 S function that I am compiling with mex. This s function loads data from external files that are located relative to the s function file itself. Say, the data is located at "..\data" relative to the s function file itself (say it is myFunction.mexw32). Is is it possible from my C++ code to determine the path the S function so that I can then determine the location of my data files? I know this is possible in a script using the mfilename('fullpath') method, but I can't find how to do it in an S function.

I really really don't want to hard code the path to the data as that will cause other issues. If I leave it relative it looks it up relative to MATLAB's current directory, not the directory of the S function (which is located elsewhere on MATLAB's path).

Thanks for any help!

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Answer 1

Kaustubha Govind 2013-5-9

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In MATLAB, you can look up the full path to any given file using the MATLAB function which. You can call this from your S-function using mexCallMATLAB, with the S-function name passed in as the input argument. Note that the S-function name is stored in the macro S_FUNCTION_NAME which is defined at the top of every S-function.