Xbase++

Fetch a Set of POP3 Messages by UIDL

Demonstrates the Chilkat MailMan.FetchUidlSet method, which retrieves the messages whose UIDLs are listed in a StringTable and appends them to an EmailBundle. The arguments are the UIDL StringTable, headersOnly, numBodyLines, and the EmailBundle. This example fetches two specific messages by UIDL.

Background: This is the efficient way to download a selected subset of a mailbox in one call — exactly the pattern for an incremental client: list the mailbox UIDLs, compare against the ones you've already stored, and fetch only the new UIDLs as a set. It avoids re-downloading messages you already have while still pulling everything new in a single operation.

Chilkat Xbase++ Downloads

Download Chilkat for Xbase++

Xbase++

LOCAL nSuccess
LOCAL oMailman
LOCAL oUidls
LOCAL oBundle
LOCAL n
LOCAL oEmail
LOCAL i

nSuccess := 0

//  Demonstrates the MailMan.FetchUidlSet method, which retrieves the messages whose UIDLs are
//  listed in a StringTable and appends them to an EmailBundle.  The arguments are the UIDL
//  StringTable, headersOnly, numBodyLines, and the EmailBundle.  The messages remain on the
//  server.

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"

//  Build the set of UIDLs to fetch.
oUidls := CreateObject("Chilkat.StringTable")
oUidls:Append("0000000123abcdef")
oUidls:Append("0000000124abcdef")

//  Fetch the listed messages (full bodies) into a bundle.
//  headersOnly=0 (fetch the entire message).
//  Note: numBodyLines only applies when headersOnly is 1 (it sets how many lines of the
//  body to include along with the headers).  When headersOnly is 0, the entire message
//  is fetched and numBodyLines is ignored.
oBundle := CreateObject("Chilkat.EmailBundle")

nSuccess := oMailman:FetchUidlSet(oUidls, 0, 0, oBundle)
IF (nSuccess == 0)
    ? oMailman:LastErrorText
    oMailman:destroy()
    oUidls:destroy()
    oBundle:destroy()
    RETURN
ENDIF

n := oBundle:MessageCount
? "Fetched " + Str(n) + " messages."

oEmail := CreateObject("Chilkat.Email")

FOR i := 0 TO n - 1
    nSuccess := oBundle:EmailAt(i, oEmail)
    ? oEmail:Subject
NEXT

//  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()
oUidls:destroy()
oBundle:destroy()
oEmail:destroy()