VB.NET

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. VB.NET

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 New Chilkat.Imap

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


' Login
success = imap.Login("****","****")
If (success = False) Then
    Debug.WriteLine(imap.LastErrorText)
    Exit Sub
End If


' Select an IMAP mailbox
success = imap.SelectMailbox("Inbox")
If (success = False) Then
    Debug.WriteLine(imap.LastErrorText)
    Exit Sub
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 New Chilkat.MessageSet
success = imap.QueryMbx("ALL",fetchUids,messageSet)
If (success = False) Then
    Debug.WriteLine(imap.LastErrorText)
    Exit Sub
End If


Dim numFound As Integer = messageSet.Count
If (numFound = 0) Then
    Debug.WriteLine("No messages found.")
    Exit Sub
End If


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


Dim i As Integer = 0
Dim bUid As Boolean = messageSet.HasUids
Dim headerOnly As Boolean = True
Dim email As New Chilkat.Email

While i < upperBound

    success = imap.FetchEmail(headerOnly,messageSet.GetId(i),bUid,email)
    If (success = False) Then
        Debug.WriteLine(imap.LastErrorText)
        Exit Sub
    End If


    Debug.WriteLine(i & ": " & email.Subject)

    i = i + 1
End While

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