Rust

Iterate MIME Parts of an Email

See more Email Object Examples

Demonstrates how to iterate over the MIME sub-parts of an email, and retrieve the content of each MIME sub-part body.

Note: This example requires some new features added to Chilkat v9.5.0.95.

Rust

// This example assumes the Chilkat API to have been previously unlocked.
// See Global Unlock Sample for sample code.

// See the following Chilkat post to Quickly Understand Email MIME

let email = chilkat::Email::new();

if email.load_eml("qa_data/eml/sample.eml").is_err() {
    println!("Failed to load .eml");
    return;
}

let sb_content_type = chilkat::StringBuilder::new();
let case_sensitive = false;

// Get the total number of non-multipart MIME sub-parts.
// (This is a simple way of iterating over all the MIME leaf parts regardless of the MIME tree structure)
let inline_only = false;
let exclude_attachments = false;
let search_spec = "*/*".to_string();

let num_parts = email.get_num_parts_of_type(&search_spec, inline_only, exclude_attachments);
let mut i = 0;
while i < num_parts {
    // What is the Content-Type of this MIME part?
    let _ = sb_content_type.append(&email.get_nth_content_type(i, &search_spec, inline_only, exclude_attachments).unwrap_or_default());
    if sb_content_type.starts_with("text/", case_sensitive) {
        // Get the text body of this MIME part.
        let text_body = email.get_nth_text_part_of_type(i, &search_spec, inline_only, exclude_attachments).unwrap_or_default();
        println!("Got text body for {}", sb_content_type.get_as_string().unwrap_or_default());
    } else {
        if sb_content_type.contents_equal("message/rfc822", case_sensitive) {
            // If the Content-Type is message/rfc822, then the MIME body for this part contains a full embedded MIME messages.
            // Your application could load it into a Chilkat email object and recursively process...
            let attached_email = chilkat::Email::new();
            let bd_mime = chilkat::BinData::new();
            let _ = email.get_nth_binary_part_of_type_bd(i, &search_spec, inline_only, exclude_attachments, &bd_mime);
            let _ = attached_email.set_from_mime_bd(&bd_mime);
            // Now your app can recursively process the attachedEmail...
        } else {
            // Get the bytes of this MIME body part.
            let bd = chilkat::BinData::new();
            let _ = email.get_nth_binary_part_of_type_bd(i, &search_spec, inline_only, exclude_attachments, &bd);
            println!("Got binary body for {} numBytes = {}", sb_content_type.get_as_string().unwrap_or_default(), bd.num_bytes());
        }

    }

    sb_content_type.clear();
    i = i + 1;
}