Directorry for Saving Settings from App Designer

I have an application written for Appdesigner. I want to be able to save user settings when they exit, and reload the next time they restart. I would like the saved data to be stored in the same directory as the app. Since the app directory is in the search path, the user can be starting the app from anywhere. How do I determine the home directory so the settings are saved and loaded from the proper location?

Answer 1

[Eric Delgado]

Just create a property named "RootFolder" and put the lines below in the startup of your app.

The property app.RootFolder will keep the name of the root folder of your app no matter it's a standalone version (deployed), a development version (project), or an installed version ("APPS" tab of Matlab).

appName = 'TheNameOfYourApp';
            
% PATH SEARCH
Flag = 1;
if isdeployed
    [~, result]    = system('path');
    app.RootFolder = char(regexpi(result, 'Path=(.*?);', 'tokens', 'once'));

    if ~isfile(fullfile(app.RootFolder, sprintf('%s.exe', appName)))
        Flag = 0;
    end    
else
    prjPath = matlab.project.rootProject;
    appPath = fullfile(char(com.mathworks.appmanagement.MlappinstallUtil.getAppInstallationFolder), appName);
    
    if ~isempty(prjPath) & strcmp(prjPath.Name, appName)
        app.RootFolder = char(prjPath.RootFolder);
    elseif isfolder(appPath)
        app.RootFolder = appPath;                    
    else
        Flag = 0;
    end
end

% INITIALIZATION            
if Flag    
% Call others functions...
else
% Error message...
end

And then you can read your config file easily (don't forget to call it using fullfile!). For example:

app.MyConfigInfo = jsondecode(fileread(fullfile(app.RootFolder, 'Settings', 'MyConfigInfo.json')));

[Mike]

Thanks Eric, that helps.