Visual Basic 6.0

Determine the Number of Unseen Email Messages

Demonstrates how to determine how many unseen messages exist in an email account on an IMAP server. Visual Basic 6.0

Dim success As Long
success = 0

' This example requires 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
success = imap.Connect("imap.example.com")
If (success = 0) Then
    Debug.Print imap.LastErrorText
    Exit Sub
End If

' Login
success = imap.Login("***","***")
If (success = 0) Then
    Debug.Print imap.LastErrorText
    Exit Sub
End If

' Select an IMAP mailbox
success = imap.SelectMailbox("Inbox")
If (success = 0) Then
    Debug.Print imap.LastErrorText
    Exit Sub
End If

' After selecting the mailbox. the total number of emails
' is immediately available:
Dim totalNum As Long
totalNum = imap.NumMessages
Debug.Print "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 Long
fetchUids = 1
Dim messageSet As New MessageSet
success = imap.QueryMbx("UNSEEN",fetchUids,messageSet)
If (success = 0) Then
    Debug.Print imap.LastErrorText
    Exit Sub
End If

Dim numUnseen As Long
numUnseen = messageSet.Count
Debug.Print numUnseen

Debug.Print "UIDs ----"

' Display the UIDs
Dim i As Long
i = 0
Do While i < messageSet.Count
    Debug.Print messageSet.GetId(i)
    i = i + 1
Loop

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