Swift

Convert 8-bit MIME Parts to Base64

Demonstrates the Chilkat Mime.Convert8Bit method, which recursively converts every part whose Content-Transfer-Encoding is 8bit or binary to base64. It takes no arguments and is a void method.

Note: The file paths are relative to the application's current working directory. Absolute paths may also be used. Supply the paths appropriate to your own environment.

Background: The original SMTP standard only guaranteed 7-bit transport, and some legacy servers still reject or mangle raw 8-bit and binary content. Converting those parts to base64 — a 7-bit-safe encoding — makes the whole message safe to relay through such systems without loss. It walks the entire tree, so a multipart message with several offending parts is fixed in one call.

Chilkat Swift Downloads

Download Chilkat for Swift

Swift


func chilkatTest() {
    var success: Bool = false

    let mime = CkoMime()!
    success = mime.loadFile(path: "qa_data/message.eml")
    if success == false {
        print("\(mime.lastErrorText!)")
        return
    }

    //  Recursively convert every part whose Content-Transfer-Encoding is 8bit or binary to base64.
    //  This makes the MIME safe to transmit over channels that only support 7-bit text (such as some
    //  legacy SMTP servers).
    mime.convert8Bit()

    print("8bit/binary parts converted to base64.")
    var mimeText: String? = mime.getMime()
    if mime.lastMethodSuccess == false {
        print("\(mime.lastErrorText!)")
        return
    }

    print("\(mimeText!)")

}