Swift

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.

Swift

func chilkatTest() {
    var success: Bool = false

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

    let charset = CkoCharset()!

    charset.fromCharset = "utf-8"
    charset.toCharset = "bom-utf-8"

    success = charset.convertFile(srcPath: "qa_data/txt/helloWorld.txt", destPath: "qa_output/helloWorldBom.txt")
    if success != true {
        print("\(charset.lastErrorText!)")
        return
    }

    print("Success.")

}