(VB.NET UWP/WinRT) Determine the Number of Unseen Email Messages

Demonstrates how to determine how many unseen messages exist in an email account on an IMAP server.

Chilkat Universal Windows Platform (UWP) / WinRT Downloads Chilkat for the Universal Windows Platform (UWP)

' This example requires 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
Dim success As Boolean = Await imap.ConnectAsync("imap.someMailServer.com")
If (success <> True) Then
    Debug.WriteLine(imap.LastErrorText)
    Exit Sub
End If


' Login
success = Await imap.LoginAsync("***","***")
If (success <> True) Then
    Debug.WriteLine(imap.LastErrorText)
    Exit Sub
End If


' Select an IMAP mailbox
success = Await imap.SelectMailboxAsync("Inbox")
If (success <> True) Then
    Debug.WriteLine(imap.LastErrorText)
    Exit Sub
End If


' After selecting the mailbox. the total number of emails
' is immediately available:
Dim totalNum As Integer = imap.NumMessages
Debug.WriteLine("Num messages = " & totalNum)

' To determine the number of unseen messages, a call
' to Search is required, which returns the set of UIDs
' of all unseen messages.

' We can choose to fetch UIDs or sequence numbers.
Dim fetchUids As Boolean = True

Dim messageSet As Chilkat.MessageSet = Await imap.SearchAsync("UNSEEN",fetchUids)
If (imap.LastMethodSuccess = False) Then
    Debug.WriteLine(imap.LastErrorText)
    Exit Sub
End If


Dim numUnseen As Integer = messageSet.Count
Debug.WriteLine(numUnseen)

Debug.WriteLine("UIDs ----")

' Display the UIDs
Dim i As Integer = 0
Dim msgId As Integer
While i < messageSet.Count
    msgId = messageSet.GetId(i)
    Debug.WriteLine(msgId)
    i = i + 1
End While

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