Dart

Determine the Number of Unseen Email Messages

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

import 'package:chilkat/chilkat.dart';

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

  final imap = CkImap();

  // Connect to an IMAP server.
  // Use TLS
  imap.ssl = true;
  imap.port = 993;
  try {
    imap.connect('imap.example.com');
  } on ChilkatException catch (e) {
    print(e.lastErrorText);
    return;
  }

  // Login
  try {
    imap.login('***', '***');
  } on ChilkatException catch (e) {
    print(e.lastErrorText);
    return;
  }

  // Select an IMAP mailbox
  try {
    imap.selectMailbox('Inbox');
  } on ChilkatException catch (e) {
    print(e.lastErrorText);
    return;
  }

  // After selecting the mailbox. the total number of emails
  // is immediately available:
  final totalNum = imap.numMessages;
  print('Num messages = $totalNum');

  // 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.
  final fetchUids = true;
  final messageSet = CkMessageSet();
  try {
    imap.queryMbx('UNSEEN', fetchUids, messageSet);
  } on ChilkatException catch (e) {
    print(e.lastErrorText);
    return;
  }

  final numUnseen = messageSet.count;
  print(numUnseen);

  print('UIDs ----');

  // Display the UIDs
  var i = 0;
  while (i < messageSet.count) {
    print(messageSet.getId(i));
    i++;
  }

  // Disconnect from the IMAP server.
  imap.disconnect();
}