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// Copyright 2015, Igor Shaula
// Licensed under the MIT License <LICENSE or
// may not be copied, modified, or distributed
// except according to those terms.
//! Structure for a registry transaction.
//! Part of `transactions` feature.
//!
//!```no_run
//!extern crate winreg;
//!use std::io;
//!use winreg::RegKey;
//!use winreg::enums::*;
//!use winreg::transaction::Transaction;
//!
//!fn main() {
//! let t = Transaction::new().unwrap();
//! let hkcu = RegKey::predef(HKEY_CURRENT_USER);
//! let (key, _disp) = hkcu.create_subkey_transacted("Software\\RustTransaction", &t).unwrap();
//! key.set_value("TestQWORD", &1234567891011121314u64).unwrap();
//! key.set_value("TestDWORD", &1234567890u32).unwrap();
//!
//! println!("Commit transaction? [y/N]:");
//! let mut input = String::new();
//! io::stdin().read_line(&mut input).unwrap();
//! input = input.trim_right().to_owned();
//! if input == "y" || input == "Y" {
//! t.commit().unwrap();
//! println!("Transaction committed.");
//! }
//! else {
//! // this is optional, if transaction wasn't committed,
//! // it will be rolled back on disposal
//! t.rollback().unwrap();
//!
//! println!("Transaction wasn't committed, it will be rolled back.");
//! }
//!}
//!```
#![cfg(feature = "transactions")]
use std::io;
use std::ptr;
use winapi::um::handleapi;
use winapi::um::ktmw32;
use winapi::um::winnt;
#[derive(Debug)]
pub struct Transaction {
pub handle: winnt::HANDLE,
}
impl Transaction {
//TODO: add arguments
pub fn new() -> io::Result<Transaction> {
unsafe {
let handle = ktmw32::CreateTransaction(
ptr::null_mut(),
ptr::null_mut(),
0,
0,
0,
0,
ptr::null_mut(),
);
if handle == handleapi::INVALID_HANDLE_VALUE {
return Err(io::Error::last_os_error());
};
Ok(Transaction { handle })
}
}
pub fn commit(&self) -> io::Result<()> {
unsafe {
match ktmw32::CommitTransaction(self.handle) {
0 => Err(io::Error::last_os_error()),
_ => Ok(()),
}
}
}
pub fn rollback(&self) -> io::Result<()> {
unsafe {
match ktmw32::RollbackTransaction(self.handle) {
0 => Err(io::Error::last_os_error()),
_ => Ok(()),
}
}
}
fn close_(&mut self) -> io::Result<()> {
unsafe {
match handleapi::CloseHandle(self.handle) {
0 => Err(io::Error::last_os_error()),
_ => Ok(()),
}
}
}
}
impl Drop for Transaction {
fn drop(&mut self) {
self.close_().unwrap_or(());
}
}