Delphi DLL

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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var
success: Boolean;
imap: HCkImap;
connected: Boolean;

begin
success := 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.

imap := CkImap_Create();

CkImap_putSsl(imap,True);
CkImap_putPort(imap,993);

success := CkImap_Connect(imap,'imap.example.com');
if (success = False) then
  begin
    Memo1.Lines.Add(CkImap__lastErrorText(imap));
    Exit;
  end;

//  Check the last known connection state (no data is sent to the server).
connected := CkImap_IsConnected(imap);
if (connected = True) then
  begin
    Memo1.Lines.Add('The IMAP object believes it is connected.');
  end
else
  begin
    Memo1.Lines.Add('The IMAP object is not connected.');
  end;

success := CkImap_Disconnect(imap);
if (success = False) then
  begin
    Memo1.Lines.Add(CkImap__lastErrorText(imap));
    Exit;
  end;

CkImap_Dispose(imap);