Rust

Attach a File to a Multipart MIME Entity

Demonstrates the Chilkat Mime.AppendPartFromFile method, which reads a local file, creates an attachment part, and appends it. The only argument is the file path; the content headers are chosen from the filename extension.

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: This is the one-call way to add an attachment: Chilkat reads the file, infers its Content-Type from the extension, base64-encodes binary content, and appends it as a child part — typically inside a multipart/mixed. It is the building block behind adding attachments to an email, saving you from constructing the part and setting its headers by hand.

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Rust


// Demonstrates the Mime.AppendPartFromFile method, which reads a local file, creates an attachment
// part, and appends it.  The only argument is the file path; the content headers are chosen from
// the filename extension.

let mime = chilkat::Mime::new();
if mime.new_multipart_mixed().is_err() {
    println!("{}", mime.last_error_text());
    return;
}

// A message body part.
let body_part = chilkat::Mime::new();
if body_part.set_body_from_plain_text("Please see the attached files.").is_err() {
    println!("{}", body_part.last_error_text());
    return;
}

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

// Attach files directly.
if mime.append_part_from_file("qa_data/report.pdf").is_err() {
    println!("{}", mime.last_error_text());
    return;
}

if mime.append_part_from_file("qa_data/photo.jpg").is_err() {
    println!("{}", mime.last_error_text());
    return;
}

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