Rust

Determine the Number of Unseen Email Messages

Demonstrates how to determine how many unseen messages exist in an email account on an IMAP server. Rust

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

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

// Connect to an IMAP server.
// Use TLS
imap.set_ssl(true);
imap.set_port(993);
if imap.connect("imap.example.com").is_err() {
    println!("{}", imap.last_error_text());
    return;
}

// Login
if imap.login("***", "***").is_err() {
    println!("{}", imap.last_error_text());
    return;
}

// Select an IMAP mailbox
if imap.select_mailbox("Inbox").is_err() {
    println!("{}", imap.last_error_text());
    return;
}

// After selecting the mailbox. the total number of emails
// is immediately available:
let total_num = imap.num_messages();
println!("Num messages = {}", total_num);

// To determine the number of unseen messages, a call
// to Search is required, which returns the set of UIDs
// of all unseen messages.

// We can choose to fetch UIDs or sequence numbers.
let fetch_uids = true;
let message_set = chilkat::MessageSet::new();
if imap.query_mbx("UNSEEN", fetch_uids, &message_set).is_err() {
    println!("{}", imap.last_error_text());
    return;
}

let num_unseen = message_set.count() as u32;
println!("{}", num_unseen);

println!("UIDs ----");

// Display the UIDs
let mut i = 0;
while i < message_set.count() {
    println!("{}", message_set.get_id(i));
    i = i + 1;
}

// Disconnect from the IMAP server.
let _ = imap.disconnect().is_ok();