Codegen supported function to delete a file and to check its existence

Hello community,

When I run codegen to compile my .m function, I'm getting this error when I use the matlab built-in function delete

??? Function 'delete' is not supported for code generation. Consider adding coder.extrinsic('delete') at the top of the function to bypass code generation.

Error in ==> pathExist Line: 15 Column: 2
Code generation failed: View Error Report

I cannot delcare delete as extrinsic because I need the executable to be stand alone.

Is the a codegen suported function to delete a file and and one check its existence?

I'm using matlab R2018a

Thank you

Answer 1

[Walter Roberson]

I believe it would go as follows:

C:

Use

coder.cinclude('<stdio.h>');
coder.ceval('remove', FILENAME);

C++:

Use

coder.cinclude('<cstdio>');
coder.ceval('std::remove', FILENAME);

It would not astonish me if the filename had to be converted to a null-terminated character vector for passing into the function.

To test whether the file exists, C include <sys/stat.h> and call stat() . C++ 17 or later include <filesystem> and call std::filesystem::exists() . For older C++ there are several methods, including include <sys/stat.h> and call stat()

[Bob Randall]

So I need to use external function calls to the c or c++ standard libs. It will definitely work. I wish codegen was a little bit more advanced. Thank you Walter

[Walter Roberson]

Generally speaking, the target model for code generation is embedded systems, which might not have any filesystem at all.

That said... code generation does support fopen(), which assumes a file system.