How do you set the binary file icon?

[MrTanoshii]

Hey guys, I managed to set the app icon (window decorator and taskbar) but I don't know how to set the binary file icon.
Does anyone have a solution please?

[nozwock]

This is not really an egui question but Icon resources for windows binaries can easily be set using the winres crate.

Though for Rust 1.61 and above, the crate doesn't work, so you'll have to use a fork containing the fix instead.
So just add the forked winres as a build dependency in your Cargo.toml:

[build-dependencies]
winres = { git = "https://github.com/Nilstrieb/winres", branch = "linking-flags" }

After that, you'll also need to add winres metadata section to your Cargo.toml, see winres for details.
The section can be left completely empty if you want though, I had to add it since winres fails for me if I don't have its section in the Cargo.toml.

Then, at last you'll need to add a build script (a file build.rs in the root of your crate):

use std::io;
use winres::WindowsResource;

// for eg. this is my build script
// I've tested this on linux and windows with rust 1.64

fn main() -> io::Result<()> {
    if std::env::var("CARGO_CFG_TARGET_FAMILY").unwrap() == "windows" {
        let mut res = WindowsResource::new();
        match std::env::var("CARGO_CFG_TARGET_ENV").unwrap().as_str() {
            "gnu" => {
                res.set_ar_path("x86_64-w64-mingw32-ar")
                    .set_windres_path("x86_64-w64-mingw32-windres");
            }
            "msvc" => {}
            _ => panic!("unsupported env"),
        };
        res.set_icon("assets/icon.ico");
        res.compile()?;
    }
    Ok(())
}

This here is the example build script on winres crate doc.

Take a look at these for more build.rs examples:
mxre/winres#33
mxre/winres#24

Edit: Fix typos

[MrTanoshii]

Thank you so much!