Generate C code from matlab code issue

why below uigetfile can't be generate C code? How can I do it?

[file,path]=uigetfile("*.png");

Answer 1

[Walter Roberson]

Code cannot be generated for uigetdir because the C standard library does not define any directory operations.

Directory operations are defined by Posix, but MATLAB Coder does not target Posix.

You can use coder.ceval to call Posix directory operations such as opendir() and related functions. You are then stuck presenting the information in some kind of graphical user interface. MATLAB Coder has no built-in support for graphics.

[xie]

@Walter Roberson

Thank you Walter! but I still have no idea to how to correct it about coder.ceval.

[Walter Roberson]

Create C code that includes dirent.h and has a single entry point. Have the C code call opendir() https://pubs.opengroup.org/onlinepubs/009604599/functions/opendir.html and have it loop calling readdir() https://pubs.opengroup.org/onlinepubs/009604599/functions/readdir.html and finally call closedir() https://pubs.opengroup.org/onlinepubs/009604599/functions/closedir.html

readdir() returns information about file names. If you need more information about the file then call stat() https://pubs.opengroup.org/onlinepubs/009604599/functions/stat.html

At this point, you have to have some kind of call to GUI code to present the list of files to the user and have the user select one of them. There are a wide variety of graphic systems, mostly incompatible, so I cannot suggest much.

There are alternatives if you are willing to commit to particular operating systems. For example Windowss https://cboard.cprogramming.com/c-programming/136029-openfiledialog-window-c.html

Now, no matter your implementation, you are going to need to return information about the file name. It is generally an error to allocate memory in C code and return the memory to MATLAB. For this reason it is typically better to allocate a buffer in MATLAB and pass the address of the buffer into C and write the resulting file name into the buffer. The buffer needs to be sized according to the operating system -- for example 260 for Windows, 1024 for MacOS and 4096 for Linux.

[xie]

Let me take some time to digest. Thank you!

[Walter Roberson]

You might be interested in https://github.com/mlabbe/nativefiledialog

Answer 2

[Raghu Boggavarapu]

We do not support MATLAB Graphics functionality for code generation. If you are primarily interested in getting list of files, you may consider using MATLAB system function and call appropriate command like "ls" to fetch the list of files. We support code generation for system function starting R2024b.

If this does not solve your use case, please share more details here Request Code Generation Support for MATLAB Functions - MATLAB & Simulink