wallpaper

Small utility that keeps the Windows and macOS desktop updated with the daily Bing wallpaper. It fetches the latest image from https://cn.bing.com and applies it at login.

Features

• blocks until an Internet connection is available before attempting to download
• writes the image once per calendar day (skips download if the previous file is still from today)
• updates the macOS desktop through AppKit
• updates both the Windows desktop and lock screen via native Win32/WinRT APIs

Requirements

• Rust 2024 toolchain (rustc and cargo)
• Windows 10+ or macOS
• Network access to https://cn.bing.com to download the JSON feed and image

Build

cargo build --release

Run

cargo run --release

The executable saves the image at ~/Pictures/today_bing.jpg and only downloads once per day.

macOS app

Build the background app bundle with:

./scripts/package-macos.sh

Move target/release/Wallpaper.app to /Applications, open it once, then add it in System Settings > General > Login Items. The app is an agent app, so it does not open Terminal or show a Dock icon when launched at login.

Notes

• chrono, ntex, serde_json, and the platform-specific crates are included in Cargo.toml.
• This project defaults to a release build (optimized, link-time optimized, and stripped). Use cargo run if you want faster iteration.