Rust

Fetch a Text IMAP Attachment as a String

Demonstrates the Chilkat Imap.FetchAttachmentString method, which returns one text attachment decoded to a string. The first argument is the Email, the second is the zero-based attachment index, and the third is the charset used to decode the bytes. This example returns the first attachment as a UTF-8 string.

Background: This is the convenient form when you simply want a small text attachment's content inline as a string. Only use it for attachments known to be text; decoding binary content through a charset can alter or corrupt the bytes. For binary data use FetchAttachmentBd, and for large text a StringBuilder (via FetchAttachmentSb) avoids an extra copy.

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Rust


// Demonstrates the Imap.FetchAttachmentString method, which downloads one text attachment and
// returns it decoded to a string.  The 1st argument is the Email, the 2nd is the zero-based
// attachment index, and the 3rd is the charset used to decode the bytes.
// 
// The message is fetched headers-only, then the attachment is downloaded on demand.

let imap = chilkat::Imap::new();

imap.set_ssl(true);
imap.set_port(993);

if imap.connect("imap.example.com").is_err() {
    println!("{}", imap.last_error_text());
    return;
}

if imap.login("user@example.com", "myPassword").is_err() {
    println!("{}", imap.last_error_text());
    return;
}

if imap.select_mailbox("Inbox").is_err() {
    println!("{}", imap.last_error_text());
    return;
}

// Fetch only the message headers.  Attachment bodies are NOT downloaded, but the ckx-imap-*
// metadata describing the attachments is present, so the attachment info methods still work.
let headers_only = true;
let use_uid = false;
let seq_num = 1;
let email = chilkat::Email::new();
if imap.fetch_email(headers_only, seq_num as u32, use_uid, &email).is_err() {
    println!("{}", imap.last_error_text());
    return;
}

let num_attach = imap.get_mail_num_attach(&email);
if num_attach > 0 {
    // FetchAttachmentString returns a string, so assign it to a string variable.
    let Ok(attach_text) = imap.fetch_attachment_string(&email, 0, "utf-8") else {
        println!("{}", imap.last_error_text());
        return;
    };

    println!("{}", attach_text);
}

if imap.disconnect().is_err() {
    println!("{}", imap.last_error_text());
    return;
}