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use alloc::{string::String, vec::Vec};
#[path = "./windows_sys.rs"]
mod windows_sys;
use windows_sys::{GetUserPreferredUILanguages, MUI_LANGUAGE_NAME, TRUE};
#[allow(clippy::as_conversions)]
pub(crate) fn get() -> impl Iterator<Item = String> {
let mut num_languages: u32 = 0;
let mut buffer_length: u32 = 0;
// Calling this with null buffer will retrieve the required buffer length
let success = unsafe {
GetUserPreferredUILanguages(
MUI_LANGUAGE_NAME,
&mut num_languages,
core::ptr::null_mut(),
&mut buffer_length,
)
} == TRUE;
if !success {
return Vec::new().into_iter();
}
let mut buffer = Vec::<u16>::new();
buffer.resize(buffer_length as usize, 0);
// Now that we have an appropriate buffer, we can query the names
let mut result = Vec::with_capacity(num_languages as usize);
let success = unsafe {
GetUserPreferredUILanguages(
MUI_LANGUAGE_NAME,
&mut num_languages,
buffer.as_mut_ptr(),
&mut buffer_length,
)
} == TRUE;
if success {
// The buffer contains names split by null char (0), and ends with two null chars (00)
for part in buffer.split(|i| *i == 0).filter(|p| !p.is_empty()) {
if let Ok(locale) = String::from_utf16(part) {
result.push(locale);
}
}
}
result.into_iter()
}