Rust

Get the Content-Type of an Attachment

Demonstrates the Chilkat Email.GetAttachmentContentType method, which returns the Content-Type header field for the Nth attachment. Attachment indexing begins at 0. This example adds an attachment and reads its content type.

Background: The Content-Type (MIME type) of an attachment — such as text/plain, application/pdf, or image/png — tells a mail client how to handle the part: whether to display it inline, offer it as a download, or pick an icon for it. Reading it lets your program filter or route attachments by type, for example extracting only the PDFs from a batch of messages.

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Rust

// Demonstrates the GetAttachmentContentType method, which returns the Content-Type header
// field for the Nth attachment.  The index is zero-based.

let email = chilkat::Email::new();
email.set_subject("Attachment content type");

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

// Get the Content-Type of the first attachment (index 0).
let ct = email.get_attachment_content_type(0).unwrap_or_default();
println!("Attachment 0 Content-Type: {}", ct);