Determine the Number of Unseen Email Messages

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

Download Chilkat Java Library

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[])
  {
    CkImap imap = new CkImap();

    boolean success;

    //  Anything unlocks the component and begins a fully-functional 30-day trial.
    success = imap.UnlockComponent("Anything for 30-day trial");
    if (success != true) {
        System.out.println(imap.lastErrorText());
        return;
    }

    //  Connect to an IMAP server.
    success = imap.Connect("mail.chilkatsoft.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;
    totalNum = (int) imap.get_NumMessages();
    System.out.println(totalNum);

    //  To determine the number of unseen messages, a call
    //  to Search is required, which returns the set of UIDs
    //  of all unseen messages.
    CkMessageSet messageSet;
    //  We can choose to fetch UIDs or sequence numbers.
    boolean fetchUids;
    fetchUids = true;

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

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

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

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

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


  }
}