Crate winreg

Crate for accessing MS Windows registry

Usage

Basic usage

# Cargo.toml
[dependencies]
winreg = "0.6"

extern crate winreg;
use std::io;
use std::path::Path;
use winreg::enums::*;
use winreg::RegKey;

fn main() -> io::Result<()> {
    println!("Reading some system info...");
    let hklm = RegKey::predef(HKEY_LOCAL_MACHINE);
    let cur_ver = hklm.open_subkey("SOFTWARE\\Microsoft\\Windows\\CurrentVersion")?;
    let pf: String = cur_ver.get_value("ProgramFilesDir")?;
    let dp: String = cur_ver.get_value("DevicePath")?;
    println!("ProgramFiles = {}\nDevicePath = {}", pf, dp);
    let info = cur_ver.query_info()?;
    println!("info = {:?}", info);
    let mt = info.get_last_write_time_system();
    println!(
        "last_write_time as winapi::um::minwinbase::SYSTEMTIME = {}-{:02}-{:02} {:02}:{:02}:{:02}",
        mt.wYear, mt.wMonth, mt.wDay, mt.wHour, mt.wMinute, mt.wSecond
    );

    // enable `chrono` feature on `winreg` to make this work
    // println!(
    //     "last_write_time as chrono::NaiveDateTime = {}",
    //     info.get_last_write_time_chrono()
    // );

    println!("And now lets write something...");
    let hkcu = RegKey::predef(HKEY_CURRENT_USER);
    let path = Path::new("Software").join("WinregRsExample1");
    let (key, disp) = hkcu.create_subkey(&path)?;

    match disp {
        REG_CREATED_NEW_KEY => println!("A new key has been created"),
        REG_OPENED_EXISTING_KEY => println!("An existing key has been opened"),
    }

    key.set_value("TestSZ", &"written by Rust")?;
    let sz_val: String = key.get_value("TestSZ")?;
    key.delete_value("TestSZ")?;
    println!("TestSZ = {}", sz_val);

    key.set_value("TestDWORD", &1234567890u32)?;
    let dword_val: u32 = key.get_value("TestDWORD")?;
    println!("TestDWORD = {}", dword_val);

    key.set_value("TestQWORD", &1234567891011121314u64)?;
    let qword_val: u64 = key.get_value("TestQWORD")?;
    println!("TestQWORD = {}", qword_val);

    key.create_subkey("sub\\key")?;
    hkcu.delete_subkey_all(&path)?;

    println!("Trying to open nonexistent key...");
    hkcu.open_subkey(&path).unwrap_or_else(|e| match e.kind() {
        io::ErrorKind::NotFound => panic!("Key doesn't exist"),
        io::ErrorKind::PermissionDenied => panic!("Access denied"),
        _ => panic!("{:?}", e),
    });
    Ok(())
}

Iterators

extern crate winreg;
use std::io;
use winreg::RegKey;
use winreg::enums::*;

fn main() -> io::Result<()> {
    println!("File extensions, registered in system:");
    for i in RegKey::predef(HKEY_CLASSES_ROOT)
        .enum_keys().map(|x| x.unwrap())
        .filter(|x| x.starts_with("."))
    {
        println!("{}", i);
    }

    let system = RegKey::predef(HKEY_LOCAL_MACHINE)
        .open_subkey("HARDWARE\\DESCRIPTION\\System")?;
    for (name, value) in system.enum_values().map(|x| x.unwrap()) {
        println!("{} = {:?}", name, value);
    }

    Ok(())
}

Modules

enums	use winreg::enums::*; to import all needed enumerations and constants
transaction	Structure for a registry transaction. Part of transactions feature.
types	Traits for loading/saving Registry values

Structs

EnumKeys	Iterator over subkeys names
EnumValues	Iterator over values
RegKey	Handle of opened registry key
RegKeyMetadata	Metadata returned by RegKey::query_info
RegValue	Raw registry value

Type Definitions

HKEY