Xbase++

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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Xbase++

LOCAL nSuccess
LOCAL oMailman
LOCAL oPartialEmail
LOCAL oFullEmail

nSuccess := 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.

oMailman := CreateObject("Chilkat.MailMan")

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

//  First fetch message 1 as headers only (a fast preview).  headerOnly=1.
oPartialEmail := CreateObject("Chilkat.Email")

nSuccess := oMailman:FetchOne(1, 0, 1, oPartialEmail)
IF (nSuccess == 0)
    ? oMailman:LastErrorText
    oMailman:destroy()
    oPartialEmail:destroy()
    RETURN
ENDIF

? "Preview subject: " + oPartialEmail:Subject

//  Now download the complete message (body and attachments).
oFullEmail := CreateObject("Chilkat.Email")
nSuccess := oMailman:FetchFull(oPartialEmail, oFullEmail)
IF (nSuccess == 0)
    ? oMailman:LastErrorText
    oMailman:destroy()
    oPartialEmail:destroy()
    oFullEmail:destroy()
    RETURN
ENDIF

? "Full email NumAttachments: " + Str(oFullEmail: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.

oMailman:destroy()
oPartialEmail:destroy()
oFullEmail:destroy()