MIME Multipart Boundary and Preamble Properties

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Demonstrates the Boundary property, which gets or sets the raw boundary token of a multipart entity (without surrounding quotation marks), and UseMmDescription, which controls whether the conventional preamble text is emitted when serializing a multipart entity.

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

// Create a multipart/mixed entity.
if mime.new_multipart_mixed().is_err() {
    println!("{}", mime.last_error_text());
    return;
}

// Boundary is the raw boundary token, without surrounding quotation marks.  Chilkat quotes it
// automatically in the serialized header when required.
mime.set_boundary("example-boundary");

// UseMmDescription controls whether the conventional preamble text
// "This is a multi-part message in MIME format." is emitted.  The default is false.
mime.set_use_mm_description(true);

// Add a simple part so the multipart has content.
let part = chilkat::Mime::new();
if part.set_body_from_plain_text("First part.").is_err() {
    println!("{}", part.last_error_text());
    return;
}

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

println!("Boundary = {}", mime.boundary());

let Ok(mime_str) = mime.get_mime() else {
    println!("{}", mime.last_error_text());
    return;
};

println!("{}", mime_str);