(Java) Determine the Number of Unseen Email Messages

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

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import com.chilkatsoft.*;

public class ChilkatExample {

  static {
    try {
        System.loadLibrary("chilkat");
    } catch (UnsatisfiedLinkError e) {
      System.err.println("Native code library failed to load.\n" + e);
      System.exit(1);
    }
  }

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

    CkImap imap = new CkImap();

    // Connect to an IMAP server.
    // Use TLS
    imap.put_Ssl(true);
    imap.put_Port(993);
    boolean success = imap.Connect("imap.someMailServer.com");
    if (success != true) {
        System.out.println(imap.lastErrorText());
        return;
        }

    // Login
    success = imap.Login("***","***");
    if (success != true) {
        System.out.println(imap.lastErrorText());
        return;
        }

    // Select an IMAP mailbox
    success = imap.SelectMailbox("Inbox");
    if (success != true) {
        System.out.println(imap.lastErrorText());
        return;
        }

    // After selecting the mailbox. the total number of emails
    // is immediately available:
    int totalNum = imap.get_NumMessages();
    System.out.println("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.
    boolean fetchUids = true;

    CkMessageSet messageSet = imap.Search("UNSEEN",fetchUids);
    if (imap.get_LastMethodSuccess() == false) {
        System.out.println(imap.lastErrorText());
        return;
        }

    int numUnseen = messageSet.get_Count();
    System.out.println(numUnseen);

    System.out.println("UIDs ----");

    // Display the UIDs
    int i = 0;
    int msgId;
    while (i < messageSet.get_Count()) {
        msgId = messageSet.GetId(i);
        System.out.println(msgId);
        i = i+1;
        }

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