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|
use super::*;
/// An iterator of registry key names.
pub struct KeyIterator<'a> {
key: &'a Key,
range: core::ops::Range<usize>,
name: Vec<u16>,
}
impl<'a> KeyIterator<'a> {
pub(crate) fn new(key: &'a Key) -> Result<Self> {
let mut count = 0;
let mut max_len = 0;
let result = unsafe {
RegQueryInfoKeyW(
key.0,
null_mut(),
null_mut(),
null_mut(),
&mut count,
&mut max_len,
null_mut(),
null_mut(),
null_mut(),
null_mut(),
null_mut(),
null_mut(),
)
};
win32_error(result).map(|_| Self {
key,
range: 0..count as usize,
name: vec![0; max_len as usize + 1],
})
}
}
impl Iterator for KeyIterator<'_> {
type Item = String;
fn next(&mut self) -> Option<Self::Item> {
self.range.next().and_then(|index| {
let mut len = self.name.len() as u32;
let result = unsafe {
RegEnumKeyExW(
self.key.0,
index as u32,
self.name.as_mut_ptr(),
&mut len,
null(),
null_mut(),
null_mut(),
null_mut(),
)
};
if result != 0 {
debug_assert_eq!(result, ERROR_NO_MORE_ITEMS);
None
} else {
Some(String::from_utf16_lossy(&self.name[0..len as usize]))
}
})
}
}
|
