Rust

Set the Charset of an Attachment

Demonstrates the Chilkat Email.SetAttachmentCharset method, which sets the charset parameter of the Content-Type header field for the attachment at a given zero-based index. This example adds a text attachment and sets its charset to utf-8.

Background: For a text attachment, the charset parameter tells the receiving client which character encoding the bytes use, so accented or non-Latin text renders correctly. Setting it explicitly (typically utf-8) removes ambiguity when the attachment contains non-ASCII content — without it, a client may guess wrong and display garbled characters.

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Rust


// Demonstrates the SetAttachmentCharset method, which sets the charset parameter of the
// Content-Type header field for the attachment at the given zero-based index.

let email = chilkat::Email::new();
email.set_subject("Set attachment charset");

let _ = email.add_string_attachment("notes.txt", "Some notes.");

// Set the charset of the first attachment (index 0) to utf-8.
if email.set_attachment_charset(0, "utf-8").is_err() {
    println!("{}", email.last_error_text());
    return;
}

// The attachment's Content-Type now includes charset="utf-8".
println!("{}", email.get_mime().unwrap_or_default());