PowerBuilder

Download the Full Version of a Partial Email

Demonstrates the Chilkat MailMan.FetchFull method, which downloads the complete version of a header-only or partial Email and stores it in a second Email. The full result includes the complete body and any attachments, and the partial email must retain its UIDL. This example previews message 1 (headers only) and then downloads it in full.

Background: A common pattern is to download headers first — cheap and fast — show the user a message list, and only pull the full content when a message is actually opened. FetchFull completes that "download on demand" flow: given a partial email (which carries its UIDL), it fetches the rest from the server. This keeps bandwidth and latency low when browsing a large mailbox.

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integer li_rc
integer li_Success
oleobject loo_Mailman
oleobject loo_PartialEmail
oleobject loo_FullEmail

li_Success = 0

//  Demonstrates the MailMan.FetchFull method, which downloads the complete version of a
//  header-only or partial Email and stores it in a second Email.  The full result includes
//  the complete body and any attachments.  The partial email must retain its UIDL.

loo_Mailman = create oleobject
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

//  Configure the POP3 server connection.
loo_Mailman.MailHost = "pop.example.com"
loo_Mailman.MailPort = 995
loo_Mailman.PopSsl = 1
loo_Mailman.PopUsername = "user@example.com"
loo_Mailman.PopPassword = "myPassword"

//  First fetch message 1 as headers only (a fast preview).  headerOnly=1.
loo_PartialEmail = create oleobject
li_rc = loo_PartialEmail.ConnectToNewObject("Chilkat.Email")

li_Success = loo_Mailman.FetchOne(1,0,1,loo_PartialEmail)
if li_Success = 0 then
    Write-Debug loo_Mailman.LastErrorText
    destroy loo_Mailman
    destroy loo_PartialEmail
    return
end if

Write-Debug "Preview subject: " + loo_PartialEmail.Subject

//  Now download the complete message (body and attachments).
loo_FullEmail = create oleobject
li_rc = loo_FullEmail.ConnectToNewObject("Chilkat.Email")

li_Success = loo_Mailman.FetchFull(loo_PartialEmail,loo_FullEmail)
if li_Success = 0 then
    Write-Debug loo_Mailman.LastErrorText
    destroy loo_Mailman
    destroy loo_PartialEmail
    destroy loo_FullEmail
    return
end if

Write-Debug "Full email NumAttachments: " + string(loo_FullEmail.NumAttachments)

//  Note: Explicitly connecting/authenticating is optional.  Chilkat MailMan automatically
//  connects and authenticates -- using the property settings above -- whenever a server
//  operation requires it.  Calling the explicit connect/authenticate methods can still be
//  helpful to determine whether a failure occurs while connecting or while authenticating.


destroy loo_Mailman
destroy loo_PartialEmail
destroy loo_FullEmail