Rust

Get an Alternative Body into a BinData

Demonstrates the Chilkat Email.GetAlternativeBodyBd method, which copies the contents of the Nth alternative body into a BinData object. The first alternative body is at index 0, and it should only be called when NumAlternatives is greater than 0. This example builds a message with plain-text and HTML alternatives and copies the first into a BinData.

Background: This is the binary counterpart to GetAlternativeBody (which returns text). Reading an alternative into a BinData preserves the exact bytes — important when a body part uses a binary or unusual transfer encoding, or when you intend to hash it or write it out verbatim rather than decode it to a string.

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Rust


// Demonstrates the GetAlternativeBodyBd method, which copies the contents of the Nth
// alternative body into a BinData object.  The first alternative body is at index 0; call
// only when NumAlternatives is greater than 0.

let email = chilkat::Email::new();
email.set_subject("GetAlternativeBodyBd example");

email.set_text_body("This is the plain-text alternative.", "text/plain");
let _ = email.add_html_alternative_body("<html><body>This is the HTML alternative.</body></html>");

// Copy the first alternative body (index 0) into a BinData object.
let bd = chilkat::BinData::new();

if email.get_alternative_body_bd(0, &bd).is_err() {
    println!("{}", email.last_error_text());
    return;
}

println!("Alternative 0 size (bytes) = {}", bd.num_bytes());