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(PowerBuilder) How to Download Messages in MessageSet One at a Time

If a message set contains a huge number of emails, it's NOT a good idea to try to download all at once into an email bundle using a method such as FetchBundle. It's better to iterate over the messages in the set to download one by one.

Chilkat ActiveX Downloads

ActiveX for 32-bit and 64-bit Windows

integer li_rc
oleobject loo_Imap
integer li_Success
integer li_FetchUids
oleobject loo_MessageSet
integer i
oleobject loo_Email

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

loo_Imap = create oleobject
li_rc = loo_Imap.ConnectToNewObject("Chilkat_9_5_0.Imap")
if li_rc < 0 then
    destroy loo_Imap
    MessageBox("Error","Connecting to COM object failed")
    return
end if

// Connect using TLS.
loo_Imap.Ssl = 1
loo_Imap.Port = 993
li_Success = loo_Imap.Connect("imap.example.com")
if li_Success <> 1 then
    Write-Debug loo_Imap.LastErrorText
    destroy loo_Imap
    return
end if

// Authenticate
li_Success = loo_Imap.Login("email_account_login","email_account_password")
if li_Success <> 1 then
    Write-Debug loo_Imap.LastErrorText
    destroy loo_Imap
    return
end if

// Select an IMAP mailbox
li_Success = loo_Imap.SelectMailbox("Inbox")
if li_Success <> 1 then
    Write-Debug loo_Imap.LastErrorText
    destroy loo_Imap
    return
end if

// Search for messages and return a set of matching messages.
// (This example will simply search for ALL messages.)
li_FetchUids = 1
loo_MessageSet = loo_Imap.Search("ALL",li_FetchUids)
if loo_Imap.LastMethodSuccess <> 1 then
    Write-Debug loo_Imap.LastErrorText
    destroy loo_Imap
    return
end if

Write-Debug "Number of messages = " + string(loo_MessageSet.Count)

i = 0
do while i < loo_MessageSet.Count
    loo_Email = loo_Imap.FetchSingle(loo_MessageSet.GetId(i),li_FetchUids)
    if loo_Imap.LastMethodSuccess <> 1 then
        Write-Debug loo_Imap.LastErrorText
        destroy loo_MessageSet
        destroy loo_Imap
        return
    end if

    Write-Debug loo_Email.From + "; " + loo_Email.Subject
    destroy loo_Email

    i = i + 1
loop

destroy loo_MessageSet

Write-Debug "OK"


destroy loo_Imap

 

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