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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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// Needs #include <CkImap.h>
// Needs #include <CkMessageSet.h>

    CkString strOut;

    CkImap imap;

    bool success;

    //  Anything unlocks the component and begins a fully-functional 30-day trial.
    success = imap.UnlockComponent("Anything for 30-day trial");
    if (success != true) {
        strOut.append(imap.lastErrorText());
        strOut.append("\r\n");
        SetDlgItemText(IDC_EDIT1,strOut.getUnicode());
        return;
    }

    //  Connect to an IMAP server.
    success = imap.Connect("mail.chilkatsoft.com");
    if (success != true) {
        strOut.append(imap.lastErrorText());
        strOut.append("\r\n");
        SetDlgItemText(IDC_EDIT1,strOut.getUnicode());
        return;
    }

    //  Login
    success = imap.Login("***","***");
    if (success != true) {
        strOut.append(imap.lastErrorText());
        strOut.append("\r\n");
        SetDlgItemText(IDC_EDIT1,strOut.getUnicode());
        return;
    }

    //  Select an IMAP mailbox
    success = imap.SelectMailbox("Inbox");
    if (success != true) {
        strOut.append(imap.lastErrorText());
        strOut.append("\r\n");
        SetDlgItemText(IDC_EDIT1,strOut.getUnicode());
        return;
    }

    //  After selecting the mailbox. the total number of emails
    //  is immediately available:
    long totalNum;
    totalNum = imap.get_NumMessages();
    strOut.appendInt(totalNum);
    strOut.append("\r\n");

    //  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 = 0;
    //  We can choose to fetch UIDs or sequence numbers.
    bool fetchUids;
    fetchUids = true;

    messageSet = imap.Search("UNSEEN",fetchUids);
    if (messageSet == 0 ) {
        strOut.append(imap.lastErrorText());
        strOut.append("\r\n");
        SetDlgItemText(IDC_EDIT1,strOut.getUnicode());
        return;
    }

    long numUnseen;
    numUnseen = messageSet->get_Count();
    strOut.appendInt(numUnseen);
    strOut.append("\r\n");

    strOut.append("UIDs ----");
    strOut.append("\r\n");

    //  Display the UIDs
    long i;
    long msgId;
    for (i = 0; i <= messageSet->get_Count() - 1; i++) {
        msgId = messageSet->GetId(i);
        strOut.appendInt(msgId);
        strOut.append("\r\n");
    }

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

    delete messageSet;

    SetDlgItemText(IDC_EDIT1,strOut.getUnicode());

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