rust_sample

get_active_window.rs

extern crate winapi;
extern crate user32;

fn main() {
    println!("{}", get_foreground_window_title())
}

fn get_foreground_window_title() -> String {
    use std::ffi::OsString;
    use std::os::windows::ffi::OsStringExt;

    unsafe {
        let whdl = user32::GetForegroundWindow();
        let length = user32::GetWindowTextLengthW(whdl);
        let mut title = vec![ 0u16; (length+1) as usize ];
        user32::GetWindowTextW(whdl, title.as_mut_ptr(), length + 1);
        OsString::from_wide(&title).to_string_lossy().into_owned()
    }
}

RustとWindowsのワイド文字列（LPCWSTR / LPWSTR） | d.sunnyone.org
klutzy/rust-windows