Rust

Convert a File's Character Encoding from UTF-8 to UFT-8-BOM

See more HTML-to-XML/Text Examples

To add a utf-8 BOM to a file is just a matter of prepending these 3 bytes to the file: 0xEF 0xBB 0xBF.

This may be difficult in some programming languages, or it may be trivial in either. Therefore, the Chilkat solution you see here might be helpful, or in a language such as C++, the Chilkat solution isn't really necessary because it's easy to do yourself.

Rust

// This example assumes the Chilkat API to have been previously unlocked.
// See Global Unlock Sample for sample code.

let charset = chilkat::Charset::new();

charset.set_from_charset("utf-8");
charset.set_to_charset("bom-utf-8");

if charset.convert_file("qa_data/txt/helloWorld.txt", "qa_output/helloWorldBom.txt").is_err() {
    println!("{}", charset.last_error_text());
    return;
}

println!("Success.");