B4X Requires Chilkat v11.0.0+

Fetch 1st N Headers of Search Results

Calls Search to get a message set, then downloads the 1st N messages in the message set. There are two equivalent ways of doing it: (1) iterate from 0 to N-1 and download each message individually, or (2) create a new message set that contains the 1st N messages and pass it to FetchHeaders. Both are demonstrated here. B4X

Dim success As Boolean = False

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

Dim imap As ChilkatImap
imap.Initialize("imap")

'  Connect to an IMAP server.
'  Use TLS
imap.Ssl = True
imap.Port = 993
success = imap.Connect("imap.example.com")
If success = False Then
    Log(imap.LastErrorText)
    Return
End If


'  Login
success = imap.Login("****", "****")
If success = False Then
    Log(imap.LastErrorText)
    Return
End If


'  Select an IMAP mailbox
success = imap.SelectMailbox("Inbox")
If success = False Then
    Log(imap.LastErrorText)
    Return
End If


'  Get the message IDs of all the emails in the mailbox
'  We can choose to fetch UIDs or sequence numbers.
Dim fetchUids As Boolean = True
Dim messageSet As ChilkatMessageSet
messageSet.Initialize
success = imap.QueryMbx("ALL", fetchUids, messageSet)
If success = False Then
    Log(imap.LastErrorText)
    Return
End If


Dim numFound As Int = messageSet.Count
If numFound = 0 Then
    Log("No messages found.")
    Return
End If


'  Get the 1st 10 messages in messageSet.
Dim upperBound As Int = 10
If numFound < upperBound Then
    upperBound = numFound
End If


Dim i As Int = 0
Dim bUid As Boolean = messageSet.HasUids
Dim headerOnly As Boolean = True
Dim email As ChilkatEmail
email.Initialize

Do While i < upperBound

    success = imap.FetchEmail(headerOnly, messageSet.GetId(i), bUid, email)
    If success = False Then
        Log(imap.LastErrorText)
        Return
    End If


    Log(i & ": " & email.Subject)

    i = i + 1
Loop

'  Disconnect from the IMAP server.
success = imap.Disconnect