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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Chilkat.Imap imap = new Chilkat.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) {
    MessageBox.Show(imap.LastErrorText);
    return;
}

//  Connect to an IMAP server.
success = imap.Connect("mail.chilkatsoft.com");
if (success != true) {
    MessageBox.Show(imap.LastErrorText);
    return;
}

//  Login
success = imap.Login("***","***");
if (success != true) {
    MessageBox.Show(imap.LastErrorText);
    return;
}

//  Select an IMAP mailbox
success = imap.SelectMailbox("Inbox");
if (success != true) {
    MessageBox.Show(imap.LastErrorText);
    return;
}

//  After selecting the mailbox. the total number of emails
//  is immediately available:
int totalNum;
totalNum = imap.NumMessages;
textBox1.Text += Convert.ToString(totalNum) + "\r\n";
textBox1.Refresh();

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

messageSet = imap.Search("UNSEEN",fetchUids);
if (messageSet == null ) {
    MessageBox.Show(imap.LastErrorText);
    return;
}

int numUnseen;
numUnseen = messageSet.Count;
textBox1.Text += Convert.ToString(numUnseen) + "\r\n";
textBox1.Refresh();

textBox1.Text += "UIDs ----" + "\r\n";
textBox1.Refresh();

//  Display the UIDs
int i;
int msgId;
for (i = 0; i <= messageSet.Count - 1; i++) {
    msgId = messageSet.GetId(i);
    textBox1.Text += Convert.ToString(msgId) + "\r\n";
    textBox1.Refresh();
}

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