(Visual Basic 6.0) 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.

Dim imap As New ChilkatImap

' Connect using TLS.
imap.Ssl = 1
imap.Port = 993
Dim success As Long
success = imap.Connect("imap.example.com")
If (success <> 1) Then
    Debug.Print imap.LastErrorText
    Exit Sub
End If

' Authenticate
success = imap.Login("email_account_login","email_account_password")
If (success <> 1) Then
    Debug.Print imap.LastErrorText
    Exit Sub
End If

' Select an IMAP mailbox
success = imap.SelectMailbox("Inbox")
If (success <> 1) Then
    Debug.Print imap.LastErrorText
    Exit Sub
End If

' Search for messages and return a set of matching messages.
' (This example will simply search for ALL messages.)
Dim fetchUids As Long
fetchUids = 1
Dim messageSet As MessageSet
Set messageSet = imap.Search("ALL",fetchUids)
If (imap.LastMethodSuccess <> 1) Then
    Debug.Print imap.LastErrorText
    Exit Sub
End If

Debug.Print "Number of messages = " & messageSet.Count

Dim i As Long
i = 0
Do While i < messageSet.Count
    Dim email As ChilkatEmail
    Set email = imap.FetchSingle(messageSet.GetId(i),fetchUids)
    If (imap.LastMethodSuccess <> 1) Then
        Debug.Print imap.LastErrorText

        Exit Sub
    End If

    Debug.Print email.From & "; " & email.Subject

    i = i + 1
Loop

Debug.Print "OK"