# winapi-rs [](https://ci.appveyor.com/project/retep998/winapi-rs/branch/master) [](https://travis-ci.org/retep998/winapi-rs) [](https://gitter.im/retep998/winapi-rs) [](https://crates.io/crates/winapi)   #
[Documentation](https://docs.rs/winapi/*/x86_64-pc-windows-msvc/winapi/)
Official IRC channel: #winapi on [Mozilla IRC](https://wiki.mozilla.org/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](http://en.wikipedia.org/wiki/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](http://www.rustaceans.org/retep998).
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.
## Example ##
Cargo.toml:
```toml
[target.'cfg(windows)'.dependencies]
winapi = { version = "0.3", features = ["winuser"] }
```
main.rs:
```Rust
#[cfg(windows)] extern crate winapi;
use std::io::Error;
#[cfg(windows)]
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) }
}
#[cfg(not(windows))]
fn print_message(msg: &str) -> Result<(), Error> {
println!("{}", msg);
Ok(())
}
fn main() {
print_message("Hello, world!").unwrap();
}
```