Check for IMAP IDLE Mailbox Updates

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Demonstrates the Chilkat Imap.IdleCheck method, which waits for mailbox updates after IdleStart has entered IDLE mode. The only argument is a timeout in milliseconds; 0 performs a non-blocking poll of notifications already received. This example waits up to 30 seconds.

Background: IdleCheck consumes the notifications already waiting on the connection rather than sending a new polling command. A typical monitoring loop repeatedly calls IdleCheck with a timeout and reacts when updates arrive. Because servers usually drop an idle connection after about 29 minutes, long-lived monitors periodically call IdleDone and then IdleStart again to refresh it.

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bool success = false;

//  Demonstrates the Imap.IdleCheck method, which waits for IMAP IDLE mailbox updates and returns
//  them.  The only argument is a timeout in milliseconds.  Use 0 for a non-blocking poll.

Chilkat.Imap imap = new Chilkat.Imap();

imap.Ssl = true;
imap.Port = 993;

success = imap.Connect("imap.example.com");
if (success == false) {
    Debug.WriteLine(imap.LastErrorText);
    return;
}

success = imap.Login("user@example.com","myPassword");
if (success == false) {
    Debug.WriteLine(imap.LastErrorText);
    return;
}

success = imap.SelectMailbox("Inbox");
if (success == false) {
    Debug.WriteLine(imap.LastErrorText);
    return;
}

success = imap.IdleStart();
if (success == false) {
    Debug.WriteLine(imap.LastErrorText);
    return;
}

//  Wait up to 30 seconds for mailbox updates.  IdleCheck returns a string, so assign it to a
//  string variable and check for success.
int timeoutMs = 30000;
string updates = imap.IdleCheck(timeoutMs);
if (imap.LastMethodSuccess == false) {
    Debug.WriteLine(imap.LastErrorText);
    return;
}

Debug.WriteLine(updates);

success = imap.IdleDone();
if (success == false) {
    Debug.WriteLine(imap.LastErrorText);
    return;
}

success = imap.Disconnect();
if (success == false) {
    Debug.WriteLine(imap.LastErrorText);
    return;
}