PowerBuilder

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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integer li_rc
integer li_Success
oleobject loo_Imap
integer li_StillConnected

li_Success = 0

//  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.

loo_Imap = create oleobject
li_rc = loo_Imap.ConnectToNewObject("Chilkat.Imap")
if li_rc < 0 then
    destroy loo_Imap
    MessageBox("Error","Connecting to COM object failed")
    return
end if

loo_Imap.Ssl = 1
loo_Imap.Port = 993

li_Success = loo_Imap.Connect("imap.example.com")
if li_Success = 0 then
    Write-Debug loo_Imap.LastErrorText
    destroy loo_Imap
    return
end if

//  Perform a low-level check of the socket connection state.
li_StillConnected = loo_Imap.CheckConnection()
if li_StillConnected = 1 then
    Write-Debug "The socket is still connected."
else
    Write-Debug "The socket is no longer connected."
end if

li_Success = loo_Imap.Disconnect()
if li_Success = 0 then
    Write-Debug loo_Imap.LastErrorText
    destroy loo_Imap
    return
end if



destroy loo_Imap