use fltk::app::prefs::{Preferences, Root};
fn main() {
let mut prefs = Preferences::new(Root::USER_L, "myfltk.org", "tempapp").unwrap();
let mut opts = Preferences::new_group(&mut prefs, "Options").unwrap();
opts.set_int("winsize", 400).unwrap();
let size = opts.get_int("winsize").unwrap_or(300);
opts.set_str("wintitle", "Hello").unwrap();
let title = opts.get_str("wintitle").unwrap_or("My Window".to_string());
println!("{}", size);
println!("{}", title);
println!("{:?}", opts.name());
println!("{:?}", prefs.filename());
}