(PowerBuilder) 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

integer li_rc
oleobject loo_Mailman
oleobject loo_Sa
integer i
integer li_NumEmails
integer li_ChunkSize
integer li_ChunkBeginIdx
integer li_ChunkEndIdx
oleobject loo_SaChunk
string ls_ChunkStr
oleobject loo_Bundle

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

loo_Mailman = create oleobject
// Use "Chilkat_9_5_0.MailMan" for versions of Chilkat < 10.0.0
li_rc = loo_Mailman.ConnectToNewObject("Chilkat.MailMan")
if li_rc < 0 then
    destroy loo_Mailman
    MessageBox("Error","Connecting to COM object failed")
    return
end if

loo_Mailman.MailHost = "pop.example.com"

loo_Mailman.PopUsername = "myLogin"
loo_Mailman.PopPassword = "myPassword"

loo_Mailman.MailPort = 995
loo_Mailman.PopSsl = 1

// Get the list of UIDLs for all emails in the mailbox.
loo_Sa = loo_Mailman.GetUidls()
if loo_Mailman.LastMethodSuccess = 0 then
    Write-Debug loo_Mailman.LastErrorText
    destroy loo_Mailman
    return
end if

li_NumEmails = loo_Sa.Count
if li_NumEmails = 0 then
    Write-Debug "Mailbox is empty"
    destroy loo_Mailman
    return
end if

li_ChunkSize = 6

// Download the emails in chunks of 6 emails each.
li_ChunkBeginIdx = 0
li_ChunkEndIdx = li_ChunkSize - 1
if li_ChunkEndIdx >= li_NumEmails then
    li_ChunkEndIdx = li_NumEmails - 1
end if

loo_SaChunk = create oleobject
// Use "Chilkat_9_5_0.StringArray" for versions of Chilkat < 10.0.0
li_rc = loo_SaChunk.ConnectToNewObject("Chilkat.StringArray")

do while (li_ChunkBeginIdx < li_NumEmails)

    Write-Debug string(li_ChunkBeginIdx) + " to " + string(li_ChunkEndIdx)

    // Build a chunk of UIDLs.
    loo_SaChunk.Clear()
    for i = li_ChunkBeginIdx to li_ChunkEndIdx
        loo_SaChunk.Append(loo_Sa.GetString(i))
    next

    // Log the UIDLs in this chunk...
    ls_ChunkStr = loo_SaChunk.SaveToText()
    Write-Debug ls_ChunkStr

    // Download this chunk of email from the POP3 server.
    loo_Bundle = loo_Mailman.FetchMultiple(loo_SaChunk)
    if loo_Mailman.LastMethodSuccess = 0 then
        Write-Debug loo_Mailman.LastErrorText
        destroy loo_Mailman
        destroy loo_SaChunk
        return
    end if

    Write-Debug "Downloaded " + string(loo_Bundle.MessageCount) + " emails."
    Write-Debug "----"

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

    destroy loo_Bundle

    // Get the next chunk...
    li_ChunkBeginIdx = li_ChunkBeginIdx + li_ChunkSize
    li_ChunkEndIdx = li_ChunkEndIdx + li_ChunkSize
    if li_ChunkEndIdx >= li_NumEmails then
        li_ChunkEndIdx = li_NumEmails - 1
    end if

loop

destroy loo_Sa


destroy loo_Mailman
destroy loo_SaChunk