PowerBuilder

Fetch 1st N Headers of Search Results

Calls Search to get a message set, then downloads the 1st N messages in the message set. There are two equivalent ways of doing it: (1) iterate from 0 to N-1 and download each message individually, or (2) create a new message set that contains the 1st N messages and pass it to FetchHeaders. Both are demonstrated here. PowerBuilder

integer li_rc
integer li_Success
oleobject loo_Imap
integer li_FetchUids
oleobject loo_MessageSet
integer li_NumFound
integer li_UpperBound
integer i
integer li_BUid
integer li_HeaderOnly
oleobject loo_Email

li_Success = 0

// This example assumes 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.Imap")
if li_rc < 0 then
    destroy loo_Imap
    MessageBox("Error","Connecting to COM object failed")
    return
end if

// Connect to an IMAP server.
// Use TLS
loo_Imap.Ssl = 1
loo_Imap.Port = 993
li_Success = loo_Imap.Connect("imap.example.com")
if li_Success = 0 then
    Write-Debug loo_Imap.LastErrorText
    destroy loo_Imap
    return
end if

// Login
li_Success = loo_Imap.Login("****","****")
if li_Success = 0 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 = 0 then
    Write-Debug loo_Imap.LastErrorText
    destroy loo_Imap
    return
end if

// Get the message IDs of all the emails in the mailbox
// We can choose to fetch UIDs or sequence numbers.
li_FetchUids = 1
loo_MessageSet = create oleobject
li_rc = loo_MessageSet.ConnectToNewObject("Chilkat.MessageSet")

li_Success = loo_Imap.QueryMbx("ALL",li_FetchUids,loo_MessageSet)
if li_Success = 0 then
    Write-Debug loo_Imap.LastErrorText
    destroy loo_Imap
    destroy loo_MessageSet
    return
end if

li_NumFound = loo_MessageSet.Count
if li_NumFound = 0 then
    Write-Debug "No messages found."
    destroy loo_Imap
    destroy loo_MessageSet
    return
end if

// Get the 1st 10 messages in messageSet.
li_UpperBound = 10
if li_NumFound < li_UpperBound then
    li_UpperBound = li_NumFound
end if

i = 0
li_BUid = loo_MessageSet.HasUids
li_HeaderOnly = 1
loo_Email = create oleobject
li_rc = loo_Email.ConnectToNewObject("Chilkat.Email")

do while i < li_UpperBound

    li_Success = loo_Imap.FetchEmail(li_HeaderOnly,loo_MessageSet.GetId(i),li_BUid,loo_Email)
    if li_Success = 0 then
        Write-Debug loo_Imap.LastErrorText
        destroy loo_Imap
        destroy loo_MessageSet
        destroy loo_Email
        return
    end if

    Write-Debug string(i) + ": " + loo_Email.Subject

    i = i + 1
loop

// Disconnect from the IMAP server.
li_Success = loo_Imap.Disconnect()


destroy loo_Imap
destroy loo_MessageSet
destroy loo_Email