File: installed_apps.rs

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// Copyright 2017, 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.
#[macro_use]
extern crate serde_derive;
extern crate winreg;
use winreg::enums::*;
use std::collections::HashMap;
use std::fmt;

#[allow(non_snake_case)]
#[derive(Debug, Serialize, Deserialize)]
struct InstalledApp {
    DisplayName: Option<String>,
    DisplayVersion: Option<String>,
    UninstallString: Option<String>
}

macro_rules! str_from_opt {
    ($s:expr) => { $s.as_ref().map(|x| &**x).unwrap_or("") }
}

impl fmt::Display for InstalledApp {
    fn fmt(&self, f: &mut fmt::Formatter) -> fmt::Result {
        write!(f, "{}-{}",
            str_from_opt!(self.DisplayName),
            str_from_opt!(self.DisplayVersion))
    }
}

fn main() {
    let hklm = winreg::RegKey::predef(HKEY_LOCAL_MACHINE);
    let uninstall_key = hklm.open_subkey("SOFTWARE\\Microsoft\\Windows\\CurrentVersion\\Uninstall")
        .expect("key is missing");

    let apps: HashMap<String, InstalledApp> = uninstall_key.decode().expect("deserialization failed");

    for (_k, v) in &apps {
        println!("{}", v);
    }
}