Rust

Create a multipart/alternative MIME Entity

Demonstrates the Chilkat Mime.NewMultipartAlternative method, which initializes the object as an empty multipart/alternative entity. It takes no arguments; the alternative representations are then appended.

Background: multipart/alternative holds several renderings of the same content and lets the client pick the best one it can display — the standard way to send an email as both plain text and HTML. Order matters: parts go from least to most preferred, so the plain-text version comes first and the HTML last, and a client shows the last one it understands.

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Rust


// Demonstrates the Mime.NewMultipartAlternative method, which initializes the object as an empty
// multipart/alternative entity, clearing any existing content.  It takes no arguments.

let mime = chilkat::Mime::new();

if mime.new_multipart_alternative().is_err() {
    println!("{}", mime.last_error_text());
    return;
}

// multipart/alternative holds two representations of the SAME content; the client displays the
// last one it can render.  Add a plain-text part, then an HTML part.
let text_part = chilkat::Mime::new();
if text_part.set_body_from_plain_text("Hello (plain text version).").is_err() {
    println!("{}", text_part.last_error_text());
    return;
}

if mime.append_part(&text_part).is_err() {
    println!("{}", mime.last_error_text());
    return;
}

let html_part = chilkat::Mime::new();
if html_part.set_body_from_html("<html><body><b>Hello</b> (HTML version).</body></html>").is_err() {
    println!("{}", html_part.last_error_text());
    return;
}

if mime.append_part(&html_part).is_err() {
    println!("{}", mime.last_error_text());
    return;
}

println!("Number of alternatives: {}", mime.num_parts());