FileID pass as function argument for Matlab Coder gen

Lukai Cai

2018 2 28

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I need to generate a function with FileID as argument. The matlab code looks like this:

outfileId = fopen('test_c.csv', 'w'); func1(outfileId);

when generate the C++ using Matlab Coder, it automatically recognize the argument type as double. And the generated C++ is something like this: func1(double outfileId){ FILE * filestar; getfilestar(outfileId, &filestar, &autoflush); .. using filestar for file processing. }

My question is: how do I assign the value when I call func1 in my manually modeled C++. (e.g. need reverse function of getfilestar).

( Currently, I manually update the generated code by commenting out getfilestar and directly passing filestar as argument. And it works)

Thanks a lot!

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Denis Gurchenkov 2018-2-28

Likai, if you want to call func1 from your hand-written C++ code, then you should have two entry-point matlab functions when generating code. One function would return the double that corresponds to file handle, and the other one would take a double as an input, and call func1.

So your C++ code first calls the first entry point to open the file, gets the double value, and then passes it to the 2nd entry pont.

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