(VBScript) Process Large POP3 Mailbox

Demonstrates how to read email from a mailbox that may contain a large number of emails.

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

Dim fso, outFile
Set fso = CreateObject("Scripting.FileSystemObject")
'Create a Unicode (utf-16) output text file.
Set outFile = fso.CreateTextFile("output.txt", True, True)

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

' For versions of Chilkat < 10.0.0, use CreateObject("Chilkat_9_5_0.MailMan")
set mailman = CreateObject("Chilkat.MailMan")

mailman.MailHost = "pop.example.com"

mailman.PopUsername = "myLogin"
mailman.PopPassword = "myPassword"

mailman.MailPort = 995
mailman.PopSsl = 1

' Get the list of UIDLs for all emails in the mailbox.
' sa is a Chilkat.StringArray
Set sa = mailman.GetUidls()
If (mailman.LastMethodSuccess = 0) Then
    outFile.WriteLine(mailman.LastErrorText)
    WScript.Quit
End If

numEmails = sa.Count
If (numEmails = 0) Then
    outFile.WriteLine("Mailbox is empty")
    WScript.Quit
End If

chunkSize = 6

' Download the emails in chunks of 6 emails each.
chunkBeginIdx = 0
chunkEndIdx = chunkSize - 1
If (chunkEndIdx >= numEmails) Then
    chunkEndIdx = numEmails - 1
End If

' For versions of Chilkat < 10.0.0, use CreateObject("Chilkat_9_5_0.StringArray")
set saChunk = CreateObject("Chilkat.StringArray")
Do While (chunkBeginIdx < numEmails)

    outFile.WriteLine(chunkBeginIdx & " to " & chunkEndIdx)

    ' Build a chunk of UIDLs.
    saChunk.Clear 
    For i = chunkBeginIdx To chunkEndIdx
        success = saChunk.Append(sa.GetString(i))
    Next

    ' Log the UIDLs in this chunk...
    chunkStr = saChunk.SaveToText()
    outFile.WriteLine(chunkStr)

    ' Download this chunk of email from the POP3 server.
    ' bundle is a Chilkat.EmailBundle
    Set bundle = mailman.FetchMultiple(saChunk)
    If (mailman.LastMethodSuccess = 0) Then
        outFile.WriteLine(mailman.LastErrorText)
        WScript.Quit
    End If

    outFile.WriteLine("Downloaded " & bundle.MessageCount & " emails.")
    outFile.WriteLine("----")

    ' Process the bundle...
    ' (your application's processing code goes here...)

    ' Get the next chunk...
    chunkBeginIdx = chunkBeginIdx + chunkSize
    chunkEndIdx = chunkEndIdx + chunkSize
    If (chunkEndIdx >= numEmails) Then
        chunkEndIdx = numEmails - 1
    End If

Loop


outFile.Close