Rust - Dynamically Load DLL

extern crate kernel32;
extern crate winapi;

use std;

use self::winapi::{STD_OUTPUT_HANDLE, INVALID_HANDLE_VALUE, CONSOLE_SCREEN_BUFFER_INFO, HANDLE, HMODULE, LOBYTE, LOWORD, WORD, DWORD, WCHAR, FARPROC, NTSTATUS };
use self::winapi::winnt::OSVERSIONINFOW;
use self::kernel32::{GetStdHandle,GetConsoleMode,SetConsoleTextAttribute,GetVersion,GetVersionExW,GetModuleHandleW,GetProcAddress};
use std::os::windows::ffi::OsStrExt;
use std::ffi::OsStr;
use std::ffi::CString;

fn win32_get_version() {
    unsafe {
        let mut osvi: OSVERSIONINFOW = { std::mem::zeroed() };
        osvi.dwOSVersionInfoSize     = std::mem::size_of::<OSVERSIONINFOW>() as DWORD;

        let mut module: Vec<u16> = "ntdll.dll".encode_utf16().collect();
        let symbol    : CString  = CString::new("RtlGetVersion").unwrap();
        let h_mod     : HMODULE  = kernel32::GetModuleHandleW(module.as_ptr());
        let h_addr    : extern "C" fn(lpVersionInformation: &mut OSVERSIONINFOW)
             = std::mem::transmute(kernel32::GetProcAddress(h_mod, symbol.as_ptr()));

        (h_addr)(&mut osvi);

        println!("{}.{}.{}", osvi.dwMajorVersion, osvi.dwMinorVersion, osvi.dwBuildNumber);
    }
}