Rust

Get the Nth Binary Part of a Content-Type into BinData

Demonstrates the Chilkat Email.GetNthBinaryPartOfTypeBd method, which loads the binary bytes of the Nth MIME sub-part matching a content-type pattern into a BinData object. The arguments are the zero-based index among the matching parts, the content-type pattern, an inlineOnly flag, an excludeAttachments flag, and the BinData that receives the bytes. This example extracts the first image/png part.

Background: This is the binary, type-targeted way to pull a specific part out of a message — ideal for extracting, say, every image/png or the one application/pdf from a complex MIME tree without caring whether it is an attachment, an inline image, or a body part. Reading into a BinData keeps the raw bytes exact, ready to save, hash, or re-transmit.

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// Demonstrates the GetNthBinaryPartOfTypeBd method, which loads the binary bytes of the Nth
// MIME sub-part matching a Content-Type pattern into a BinData object.  The arguments are
// the zero-based index among matching parts, the Content-Type pattern, inlineOnly,
// excludeAttachments, and the BinData that receives the bytes.

let email = chilkat::Email::new();
email.set_subject("GetNthBinaryPartOfTypeBd example");
email.set_body("See the attached image.");

// Load the image from a file into a BinData object and attach it (binary data belongs
// in a BinData, never in a string).
let bd_image = chilkat::BinData::new();
if bd_image.load_file("qa_data/images/photo.png").is_err() {
    println!("{}", bd_image.last_error_text());
    return;
}

if email.add_attachment_bd("photo.png", &bd_image, "image/png").is_err() {
    println!("{}", email.last_error_text());
    return;
}

// Load the bytes of the first (index 0) image/png part into a BinData object.
let bd = chilkat::BinData::new();
if email.get_nth_binary_part_of_type_bd(0, "image/png", false, false, &bd).is_err() {
    println!("{}", email.last_error_text());
    return;
}

println!("image/png part size (bytes) = {}", bd.num_bytes());

// Note: The path "qa_data/images/photo.png" is a relative local filesystem path,
// relative to the current working directory of the running application.