can winreg-rs read offline hive files?

[muteb]

I was wondering if winreg-rs read offline file for different users not loaded as predef e.x: hive in "/tmp/ntuser.dat".

Thanks,

[gentoo90]

Ok. So. I have added the method for that. But.

Current release of winapi lacks the required function, RegLoadAppKeyW. It's already in the upstream, but it's unclear when it's going to be released (see retep998/winapi-rs#863 for details).
And I'm not going to release this without it.

So for now you can ether use winapi and winreg from git:

#in Cargo.toml
[patch.crates-io]
winapi = { git ="https://github.com/retep998/winapi-rs", branch = "0.3" }
winreg = { git = "https://github.com/gentoo90/winreg-rs", branch = "load-app-key" }

// in the code
let my_hive = RegKey::load_app_key("C:\\data\\myhive.dat", false)?;
for (k, v) in my_hive.open_subkey("My Subkey")?.enum_values().map(|x| x.unwrap()) {
    println!("{}", k);
}

or implement the function yourself:

use std::os::windows::ffi::OsStrExt;
use std::ffi::OsStr;
use std::io;
use std::ptr;
use winapi::shared::minwindef::{DWORD, HKEY, PHKEY};
use winapi::um::winreg as winapi_reg;
use winapi::um::winnt::{LONG, LPCWSTR};
use winreg::{enums, RegKey};

macro_rules! werr {
    ($e:expr) => {
        Err(io::Error::from_raw_os_error($e as i32))
    };
}

fn to_utf16<P: AsRef<OsStr>>(s: P) -> Vec<u16> {
    s.as_ref()
        .encode_wide()
        .chain(Some(0).into_iter())
        .collect()
}

extern "system" {
    pub fn RegLoadAppKeyW(
        lpFile: LPCWSTR,
        phkResult: PHKEY,
        samDesired: winapi_reg::REGSAM,
        dwOptions: DWORD,
        Reserved: DWORD,
    ) -> LONG;
}

fn load_app_key<N: AsRef<OsStr>>(name: N, lock: bool, perms: winapi_reg::REGSAM) -> io::Result<RegKey> {
    let c_name = to_utf16(name);
    let mut new_hkey: HKEY = ptr::null_mut();
    match unsafe {
        RegLoadAppKeyW(
            c_name.as_ptr(), 
            &mut new_hkey, 
            perms, 
            if lock { winapi_reg::REG_PROCESS_APPKEY } else { 0 }, 
            0
        ) as DWORD
    } {
        0 => Ok(RegKey::predef(new_hkey)),
        err => werr!(err),
    }
}

fn main() -> io::Result<()> {
    let my_hive = load_app_key("C:\\data\\myhive.dat", false, enums::KEY_READ)?;
    for (k, v) in my_hive.open_subkey("My Subkey")?.enum_values().map(|x| x.unwrap()) {
        println!("{}", k);
    }
    Ok(())
}

[muteb]

Thanks alot..

[fenhl]

Any updates on getting this released on crates.io? The upstream blocker seems to be resolved.

[gentoo90]

Published on crates.io as v0.10.0 v0.10.1