rfd 0.15.3

Rusty File Dialog
Documentation 
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use std::io::{self, Read};

fn main() {
    #[cfg(not(feature = "gtk3"))]
    let res = "";
    #[cfg(any(
        target_os = "windows",
        target_os = "macos",
        all(
            any(
                target_os = "linux",
                target_os = "freebsd",
                target_os = "dragonfly",
                target_os = "netbsd",
                target_os = "openbsd"
            ),
            feature = "gtk3"
        )
    ))]
    let res = rfd::MessageDialog::new()
        .set_title("Msg!")
        .set_description("Description!")
        .set_buttons(rfd::MessageButtons::OkCancel)
        .set_level(rfd::MessageLevel::Error)
        .show();
    println!("res: {}, Ctrl+D", res);

    let mut stdin = io::stdin();
    let mut buffer: Vec<u8> = vec![];
    stdin.read_to_end(&mut buffer).unwrap();

    #[cfg(any(
        target_os = "windows",
        target_os = "macos",
        all(
            any(
                target_os = "linux",
                target_os = "freebsd",
                target_os = "dragonfly",
                target_os = "netbsd",
                target_os = "openbsd"
            ),
            feature = "gtk3"
        )
    ))]
    futures::executor::block_on(async move {
        let res = rfd::AsyncMessageDialog::new()
            .set_title("Msg!")
            .set_description("Description!")
            .set_buttons(rfd::MessageButtons::OkCancel)
            .show()
            .await;
        println!("res: {}", res);
    });

    println!("Ctrl+D");
    let mut stdin = io::stdin();
    let mut buffer: Vec<u8> = vec![];
    stdin.read_to_end(&mut buffer).unwrap();
    println!();
}