We can get and set the folders in Project Preferences in OpticStudio using ZOS API.

1. Save the Project Preferences Configuration(.CFG) file in Zemax LLC\Documents\Zemax\Configs or you can use default Project Prefrences configuration file OpticStudio

   

    

2. Add the following code for connecting saved configuration file                                 Python Code                                                               print('\n===PreferencesFile===\n')
   cfgFile = r"ZemaxLLC\Documents\Zemax\Configs\Project_Prefferences_test.CFG"
   print(os.path.exists(cfgFile))
           if (cfgFile):
               self.TheConnection.PreferencesFile = cfgFile
           else:
               print('Default OpticStudio.CFG preferences used\n')                           MATLAB Code:                                                                                                             fprintf('\n===PreferencesFile===\n')
    cfgFile = 'C:\Users\Documents\Zemax\Configs\Project_Prefferences_test.CFG';
    if exist(cfgFile, 'file')
              TheConnection.PreferencesFile = cfgFile;
              fprintf('PreferencesFile: %s\n', char(TheConnection.PreferencesFile))
    else
            fprintf('Default OpticStudio.CFG preferences used\n');
    end

   

   3. Change the code in the BeginApplication method                                  % Add your custom code here...
      % Define variables for Project Preferences 
      Preference = TheApplication.Preferences;
      PrefG = Preference.Folders;
      Logic = {'False', 'True'};
      % Read and print the initial settings
      fprintf('\n===Check initial Settings===\n');
      fprintf('ZplDirectory: %s\n', char(PrefG.ZplDirectory));
      PrefG.ZplDirectory="C:\test\POP\POP\BEAMFILES";
      disp(PrefG.ZplDirectory);

      

          Preference = TheApplication.Preferences
          PrefG = Preference.Folders
          Logic = {'False', 'True'}
          # Read and print the initia settings
          print('\n===Check initial Settings===\n')
          print('ZplDirectory:', PrefG.ZplDirectory)
          PrefG.ZplDirectory="C:\test\POP\POP\BEAMFILES"
          print(PrefG.ZplDirectory)