winreg 0.56.0

Rust bindings to MS Windows Registry API
Documentation 
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// Copyright 2023, Igor Shaula
// Licensed under the MIT License <LICENSE or
// http://opensource.org/licenses/MIT>. This file
// may not be copied, modified, or distributed
// except according to those terms.
use serde_derive::{Deserialize, Serialize};
use std::collections::HashMap;
use std::error::Error;
use winreg::HKCU;

#[derive(Debug, Serialize, Deserialize, PartialEq)]
struct Coords {
    x: u32,
    y: u32,
}

#[derive(Debug, Serialize, Deserialize, PartialEq)]
struct Size {
    w: u32,
    h: u32,
}

#[derive(Debug, Serialize, Deserialize, PartialEq)]
struct Rectangle {
    coords: Option<Coords>,
    size: Size,
}

#[derive(Debug, Serialize, Deserialize, PartialEq)]
struct Test {
    t_bool: bool,
    t_u8: u8,
    t_u16: u16,
    t_u32: u32,
    t_u64: u64,
    t_usize: usize,
    t_struct: Rectangle,
    t_map: HashMap<String, u32>,
    t_string: String,
    t_optional_string: Option<String>,
    #[serde(with = "serde_bytes")]
    t_bytes: Vec<u8>,
    #[serde(rename = "")] // empty name becomes the (Default) value in the registry
    t_char: char,
    t_i8: i8,
    t_i16: i16,
    t_i32: i32,
    t_i64: i64,
    t_isize: isize,
    t_f64: f64,
    t_f32: f32,
}

fn main() -> Result<(), Box<dyn Error>> {
    let (key, _disp) = HKCU.create_subkey("Software\\RustEncode")?;

    let mut map = HashMap::new();
    map.insert("".to_owned(), 0); // empty name becomes the (Default) value in the registry
    map.insert("v1".to_owned(), 1);
    map.insert("v2".to_owned(), 2);
    map.insert("v3".to_owned(), 3);

    let v1 = Test {
        t_bool: false,
        t_u8: 127,
        t_u16: 32768,
        t_u32: 123_456_789,
        t_u64: 123_456_789_101_112,
        t_usize: 1_234_567_891,
        t_struct: Rectangle {
            coords: Some(Coords { x: 55, y: 77 }),
            size: Size { w: 500, h: 300 },
        },
        t_map: map,
        t_string: "test 123!".to_owned(),
        t_optional_string: Some("test 456!".to_owned()),
        t_bytes: vec![0xDE, 0xAD, 0xBE, 0xEF],
        t_char: 'a',
        t_i8: -123,
        t_i16: -2049,
        t_i32: 20100,
        t_i64: -12_345_678_910,
        t_isize: -1_234_567_890,
        t_f64: -0.01,
        t_f32: 3.15,
    };

    // to just write the data from structure without touching other
    // subkeys/values in the target key:
    key.encode(&v1)?;

    // or
    // to wipe out everything under the target key:
    // key.encode_destructive(&v1)?;

    let v2: Test = key.decode()?;
    println!("Decoded {:?}", v2);

    println!("Equal to encoded: {:?}", v1 == v2);
    Ok(())
}