本文提供了读取windows注册表值的方法。
读取字符串的值
#![cfg(windows)]
use anyhow::Result;
use windows::{core::*, Win32::System::Registry::*};
/// 查询windows注册表的值
fn query_reg_value() -> Result<String> {
unsafe {
// 打开注册表
let mut key = HKEY::default();
RegOpenKeyExA(
HKEY_LOCAL_MACHINE,
s!(r"SOFTWARE\GitForWindows"),
0,
KEY_QUERY_VALUE,
&mut key,
)?;
// 获得 value 的字节数
let mut len = 0;
RegQueryValueExA(
key,
s!("InstallPath"),
None,
None,
None,
Some(&mut len),
)?;
// 获取 value 的值
let mut buffer = vec![0u8; (len) as usize];
RegQueryValueExA(
key,
s!("InstallPath"),
None,
None,
Some(buffer.as_mut_ptr() as _),
Some(&mut len),
)?;
// 转换为字符串
let value = String::from_utf8_lossy(&buffer);
// 去掉结尾的空字符
let value = value.trim_end_matches("\0");
Ok(value.to_string())
}
}
#[test]
fn test_query_reg_value() {
let actual = query_reg_value().unwrap();
let expect = r"C:\Program Files\Git".to_string();
assert_eq!(actual, expect);
}