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  2. Cargo.toml
  7. src/

winapi-rs Build status Build Status Gitter Lines of Code 100% unsafe


Official IRC channel: #winapi on Mozilla IRC

This crate provides raw FFI bindings to all of Windows API. They are gathered by hand using the Windows 10 SDK from Microsoft. I aim to replace all existing Windows FFI in other crates with this crate through the “Embrace, extend, and extinguish” technique.

If this crate is missing something you need, feel free to create an issue, open a pull request, or contact me via other means.

This crate depends on Rust 1.6 or newer on Windows. On other platforms this crate is a no-op and should compile with Rust 1.2 or newer.

Frequently asked questions

How do I create an instance of a union?

Use std::mem::zeroed() to create an instance of the union, and then assign the value you want using one of the variant methods.

Why am I getting errors about unresolved imports?

Each module is gated on a feature flag, so you must enable the appropriate feature to gain access to those items. For example, if you want to use something from winapi::um::winuser you must enable the winuser feature.

How do I know which module an item is defined in?

You can use the search functionality in the documentation to find where items are defined.

Why is there no documentation on how to use anything?

This crate is nothing more than raw bindings to Windows API. If you wish to know how to use the various functionality in Windows API, you can look up the various items on MSDN which is full of detailed documentation.



winapi = { version = "0.3", features = ["winuser"] }

#[cfg(windows)] extern crate winapi;
use std::io::Error;

fn print_message(msg: &str) -> Result<i32, Error> {
    use std::ffi::OsStr;
    use std::iter::once;
    use std::os::windows::ffi::OsStrExt;
    use std::ptr::null_mut;
    use winapi::um::winuser::{MB_OK, MessageBoxW};
    let wide: Vec<u16> = OsStr::new(msg).encode_wide().chain(once(0)).collect();
    let ret = unsafe {
        MessageBoxW(null_mut(), wide.as_ptr(), wide.as_ptr(), MB_OK)
    if ret == 0 { Err(Error::last_os_error()) }
    else { Ok(ret) }
fn print_message(msg: &str) -> Result<(), Error> {
    println!("{}", msg);
fn main() {
    print_message("Hello, world!").unwrap();