(AutoIt) How to Download Messages in MessageSet One at a Time

If a message set contains a huge number of emails, it's NOT a good idea to try to download all at once into an email bundle using a method such as FetchBundle. It's better to iterate over the messages in the set to download one by one.

Chilkat ActiveX Downloads ActiveX for 32-bit and 64-bit Windows

; This example requires the Chilkat API to have been previously unlocked.
; See Global Unlock Sample for sample code.

$oImap = ObjCreate("Chilkat.Imap")

; Connect using TLS.
$oImap.Ssl = True
$oImap.Port = 993
Local $bSuccess = $oImap.Connect("imap.example.com")
If ($bSuccess <> True) Then
    ConsoleWrite($oImap.LastErrorText & @CRLF)
    Exit
EndIf

; Authenticate
$bSuccess = $oImap.Login("email_account_login","email_account_password")
If ($bSuccess <> True) Then
    ConsoleWrite($oImap.LastErrorText & @CRLF)
    Exit
EndIf

; Select an IMAP mailbox
$bSuccess = $oImap.SelectMailbox("Inbox")
If ($bSuccess <> True) Then
    ConsoleWrite($oImap.LastErrorText & @CRLF)
    Exit
EndIf

; Search for messages and return a set of matching messages.
; (This example will simply search for ALL messages.)
Local $bFetchUids = True
Local $oMessageSet = $oImap.Search("ALL",$bFetchUids)
If ($oImap.LastMethodSuccess <> True) Then
    ConsoleWrite($oImap.LastErrorText & @CRLF)
    Exit
EndIf

ConsoleWrite("Number of messages = " & $oMessageSet.Count & @CRLF)

Local $i = 0
While $i < $oMessageSet.Count
Local $oEmail = $oImap.FetchSingle($oMessageSet.GetId($i),$bFetchUids)
    If ($oImap.LastMethodSuccess <> True) Then
        ConsoleWrite($oImap.LastErrorText & @CRLF)

        Exit
    EndIf

    ConsoleWrite($oEmail.From & "; " & $oEmail.Subject & @CRLF)

    $i = $i + 1
Wend

ConsoleWrite("OK" & @CRLF)