Lua

Check the IMAP Socket Connection

Demonstrates the Chilkat Imap.CheckConnection method, which checks whether the underlying TCP socket is currently connected to the IMAP server. This performs a low-level socket-state check and does not send an IMAP command. This example connects and checks the socket.

Background: CheckConnection sits between the cached IsConnected and a full protocol round trip: it inspects the actual socket without sending an IMAP command, so it can catch a locally-closed socket that the cached flag would miss. It still cannot detect every half-open connection, though — only a real command like Noop that expects a server reply proves the session is genuinely alive end to end.

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Lua

local chilkat = require("chilkat")

-- Demonstrates the Imap.CheckConnection method, which checks whether the underlying TCP
-- socket is currently connected to the IMAP server.  This is a low-level socket-state check
-- and does not send an IMAP command.

local imap = chilkat.Imap.new()

imap.ssl = true
imap.port = 993

local success = imap:connect("imap.example.com")
if not success then
    print(imap.last_error_text)
    return
end

-- Perform a low-level check of the socket connection state.
local stillConnected = imap:check_connection()
if stillConnected then
    print("The socket is still connected.")
else
    print("The socket is no longer connected.")
end

success = imap:disconnect()
if not success then
    print(imap.last_error_text)
    return
end