(Visual FoxPro) How to Download Messages in MessageSet One at a Time

If a message set contains a huge number of emails, it's NOT a good idea to try to download all at once into an email bundle using a method such as FetchBundle. It's better to iterate over the messages in the set to download one by one.

Note: This example requires Chilkat v11.0.0 or greater.

Chilkat ActiveX Downloads ActiveX for 32-bit and 64-bit Windows

LOCAL lnSuccess
LOCAL loImap
LOCAL lnFetchUids
LOCAL loMessageSet
LOCAL loEmail
LOCAL i

lnSuccess = 0

* This example requires the Chilkat API to have been previously unlocked.
* See Global Unlock Sample for sample code.

loImap = CreateObject('Chilkat.Imap')

* Connect using TLS.
loImap.Ssl = 1
loImap.Port = 993
lnSuccess = loImap.Connect("imap.example.com")
IF (lnSuccess = 0) THEN
    ? loImap.LastErrorText
    RELEASE loImap
    CANCEL
ENDIF

* Authenticate
lnSuccess = loImap.Login("email_account_login","email_account_password")
IF (lnSuccess = 0) THEN
    ? loImap.LastErrorText
    RELEASE loImap
    CANCEL
ENDIF

* Select an IMAP mailbox
lnSuccess = loImap.SelectMailbox("Inbox")
IF (lnSuccess = 0) THEN
    ? loImap.LastErrorText
    RELEASE loImap
    CANCEL
ENDIF

* Search for messages and return a set of matching messages.
* (This example will simply search for ALL messages.)
lnFetchUids = 1

loMessageSet = CreateObject('Chilkat.MessageSet')
lnSuccess = loImap.QueryMbx("ALL",lnFetchUids,loMessageSet)
IF (lnSuccess = 0) THEN
    ? loImap.LastErrorText
    RELEASE loImap
    RELEASE loMessageSet
    CANCEL
ENDIF

? "Number of messages = " + STR(loMessageSet.Count)

loEmail = CreateObject('Chilkat.Email')
i = 0
DO WHILE i < loMessageSet.Count
    lnSuccess = loImap.FetchEmail(0,loMessageSet.GetId(i),lnFetchUids,loEmail)
    IF (lnSuccess = 0) THEN
        ? loImap.LastErrorText
        RELEASE loImap
        RELEASE loMessageSet
        RELEASE loEmail
        CANCEL
    ENDIF

    ? loEmail.From + "; " + loEmail.Subject

    i = i + 1
ENDDO

? "OK"

RELEASE loImap
RELEASE loMessageSet
RELEASE loEmail