(Visual Basic 6.0) 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.

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

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

Dim imap As New ChilkatImap

' Connect to an IMAP server.
' Use TLS
imap.Ssl = 1
imap.Port = 993
Dim success As Long
success = imap.Connect("imap.someMailServer.com")
If (success <> 1) Then
    Debug.Print imap.LastErrorText
    Exit Sub
End If

' Login
success = imap.Login("****","****")
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

Dim messageSet As MessageSet
' We can choose to fetch UIDs or sequence numbers.
Dim fetchUids As Long
fetchUids = 1
' Get the message IDs of all the emails in the mailbox
Set messageSet = imap.Search("ALL",fetchUids)
If (imap.LastMethodSuccess = 0) Then
    Debug.Print imap.LastErrorText
    Exit Sub
End If

Dim numFound As Long
numFound = messageSet.Count
If (numFound = 0) Then
    Debug.Print "No messages found."

    Exit Sub
End If

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

Dim i As Long
i = 0
Dim bUid As Long
bUid = messageSet.HasUids
Do While i < upperBound

    Dim email As ChilkatEmail
    Set email = imap.FetchSingleHeader(messageSet.GetId(i),bUid)
    If (imap.LastMethodSuccess = 0) Then
        Debug.Print imap.LastErrorText

        Exit Sub

    Else
        ' Do whatever is needed with the email.. 
        ' ....

    End If

    i = i + 1
Loop

' Alternatively, create a new message set containing the 1st 10 message id's (UID's) 
' from the search results message set:
Dim firstTen As New MessageSet

For i = 0 To upperBound - 1
    firstTen.InsertId messageSet.GetId(i)
Next

' Download the 1st ten headers:
Dim bundle As ChilkatEmailBundle
Set bundle = imap.FetchHeaders(firstTen)
If (imap.LastMethodSuccess = 0) Then

    Debug.Print imap.LastErrorText
    Exit Sub
End If

' Other examples show how to iterate over the emails contained within the bundle...

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