How to get window position and size of a different process?

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2

I’m not aware of a crate for it, but the code (using windows-sys in this case) is not too complicated:

use std::{os::windows::prelude::OsStrExt, iter::once, ptr::null};
use windows_sys::Win32::{UI::WindowsAndMessaging::{FindWindowW, GetWindowRect}, Foundation::{HWND, RECT}};

fn main() {
    let name_or_id = std::env::args_os().nth(1).unwrap();
    let id: HWND = match name_or_id.to_str().and_then(|s| s.parse().ok()) {
        Some(id) => id,
        None => {
            let name: Vec<u16> = name_or_id.as_os_str().encode_wide().chain(once(0)).collect();
            unsafe { FindWindowW(null(), name.as_ptr()) }
        }
    };
    let mut rect = RECT { left: 0, top: 0, right: 0, bottom: 0 };
    if id != 0 && unsafe { GetWindowRect(id, &mut rect) } != 0 {
        println!("{} {} {}", id, rect.right - rect.left, rect.bottom - rect.top);
    }
}

I've done Windows Rust development on an Azure Windows Server, but I know that would be a bit inconvenient. You should be able to cross-compile to x86_64-pc-windows-gnu from Linux to at least see if the code builds:

rustup target add x86_64-pc-windows-gnu
cargo build -v --target x86_64-pc-windows-gnu