(VB.NET) 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 .NET Downloads Chilkat .NET Framework Chilkat for .NET Core

' 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 = imap.Connect("imap.someMailServer.com")
If (success <> True) Then
    Debug.WriteLine(imap.LastErrorText)
    Exit Sub
End If


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


' Select an IMAP mailbox
success = imap.SelectMailbox("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 = imap.Search("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 = imap.Disconnect()