Rust

Set the Content-Disposition of an Attachment

Demonstrates the Chilkat Email.SetAttachmentDisposition method, which sets the Content-Disposition value for the attachment at a given zero-based index. The default disposition is attachment. This example changes an attachment's disposition to inline.

Background: The Content-Disposition header hints how a client should present a part: attachment means "offer it as a download," while inline means "display it within the message" (as an email client does with an embedded image). Setting it lets you control that behavior — though clients ultimately decide how to honor the hint.

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Rust


// Demonstrates the SetAttachmentDisposition method, which sets the Content-Disposition
// value for the attachment at the given zero-based index.  The default disposition is
// "attachment".

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

let _ = email.add_string_attachment("image.txt", "(pretend inline content)");

// Set the disposition of the first attachment (index 0) to "inline".
if email.set_attachment_disposition(0, "inline").is_err() {
    println!("{}", email.last_error_text());
    return;
}

// The attachment's Content-Disposition is now "inline".
println!("{}", email.get_mime().unwrap_or_default());