VB.NET

Check the Last Known IMAP Connection State

Demonstrates the Chilkat Imap.IsConnected method, which returns the last known connection state without sending any data to the IMAP server. A true result does not prove that an idle connection is still usable. This example connects and reads the state.

Background: IsConnected is a cheap, cached check — it reports what Chilkat last observed without touching the network. That makes it fast, but it can be stale: a server or firewall may have silently dropped an idle connection. When you need to be sure the connection is actually alive, send a lightweight round trip such as Noop, or use CheckConnection for a low-level socket probe.

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Dim success As Boolean = False

'  Demonstrates the Imap.IsConnected method, which returns the last known connection state
'  without sending data to the IMAP server.  A true result does not prove that an idle
'  connection is still usable.

Dim imap As New Chilkat.Imap

imap.Ssl = True
imap.Port = 993

success = imap.Connect("imap.example.com")
If (success = False) Then
    Debug.WriteLine(imap.LastErrorText)
    Exit Sub
End If


'  Check the last known connection state (no data is sent to the server).
Dim connected As Boolean = imap.IsConnected()
If (connected = True) Then
    Debug.WriteLine("The IMAP object believes it is connected.")
Else
    Debug.WriteLine("The IMAP object is not connected.")
End If


success = imap.Disconnect()
If (success = False) Then
    Debug.WriteLine(imap.LastErrorText)
    Exit Sub
End If