OpenDirectoryDialog

// Insert code here to initialize your application
    
    NSOpenPanel* openDlg = [NSOpenPanel openPanel];
    
    // Enable the selection of files in the dialog.
    [openDlg setCanChooseFiles:NO];
    
    // Multiple files not allowed
    [openDlg setAllowsMultipleSelection:NO];
    
    // Can't select a directory
    [openDlg setCanChooseDirectories:YES];
    
    // Display the dialog. If the OK button was pressed,
    // process the files.
    if ( [openDlg runModal] == NSOKButton )
    {
        // Get an array containing the full filenames of all
        // files and directories selected.
        NSArray* urls = [openDlg URLs];
        
        // Loop through all the files and process them.
        for(int i = 0; i < [urls count]; i++ )
        {
            NSString* url = [urls objectAtIndex:i];
            NSLog(@"Url: %@", url);
        }
    }