如何在POSIX系统上将OsString转换为u16？

use std::ffi::{OsString, CString};
use std::os::unix::ffi::OsStringExt;

fn os_string_to_u16(os_string: OsString) -> Result<Vec<u16>, std::string::FromUtf16Error> {
    // Convert OsString to CString
    let c_string = CString::new(os_string.into_vec())?;

    // Get the raw pointer to the underlying C string
    let c_str = c_string.as_ptr();

    // Convert C string to u16
    let u16_vec: Vec<u16> = unsafe { std::ffi::CStr::from_ptr(c_str).to_utf16().collect() };

    Ok(u16_vec)
}

fn main() {
    let os_string = OsString::from("Hello, 世界!");

    match os_string_to_u16(os_string) {
        Ok(u16_vec) => {
            for u16_char in u16_vec {
                println!("{}", u16_char);
            }
        }
        Err(error) => {
            println!("Error: {}", error);
        }
    }
}