Lianja

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.

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llSuccess = .F.

//  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.

loMailman = createobject("CkMailMan")

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

//  Build the set of UIDLs to fetch.
loUidls = createobject("CkStringTable")
loUidls.Append("0000000123abcdef")
loUidls.Append("0000000124abcdef")

//  Fetch the listed messages (full bodies) into a bundle.
//  headersOnly=.F. (fetch the entire message).
//  Note: numBodyLines only applies when headersOnly is .T. (it sets how many lines of the
//  body to include along with the headers).  When headersOnly is .F., the entire message
//  is fetched and numBodyLines is ignored.
loBundle = createobject("CkEmailBundle")

llSuccess = loMailman.FetchUidlSet(loUidls,.F.,0,loBundle)
if (llSuccess = .F.) then
    ? loMailman.LastErrorText
    release loMailman
    release loUidls
    release loBundle
    return
endif

n = loBundle.MessageCount
? "Fetched " + str(n) + " messages."

loEmail = createobject("CkEmail")

for i = 0 to n - 1
    llSuccess = loBundle.EmailAt(i,loEmail)
    ? loEmail.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.


release loMailman
release loUidls
release loBundle
release loEmail