Visual FoxPro

Fetch a Chunk of Messages, Tracking Failures

Demonstrates the Chilkat Imap.FetchChunk2 method, which downloads a run of messages by sequence number and reports which succeeded and which failed. The arguments are the starting sequence number, the count, a MessageSet that receives the failed IDs, a MessageSet that receives the successfully-fetched IDs, and the EmailBundle. This example fetches the first chunk of messages and reports the success and failure counts.

Background: When bulk-downloading a large mailbox, individual messages can occasionally fail to fetch (a corrupt message on the server, a transient error) without failing the whole operation. FetchChunk2 is designed for that reality: it returns a partial EmailBundle plus two MessageSet objects so your code can log or retry exactly the messages that did not come through, rather than aborting the entire sync.

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LOCAL lnSuccess
LOCAL loImap
LOCAL lnNumMessages
LOCAL lnCount
LOCAL loFailedSet
LOCAL loFetchedSet
LOCAL loBundle

lnSuccess = 0

*  Demonstrates the Imap.FetchChunk2 method, which downloads a run of messages by sequence
*  number and reports which succeeded and which failed.  The 1st argument is the starting
*  sequence number, the 2nd is the count, the 3rd receives the failed IDs, the 4th receives
*  the successfully-fetched IDs, and the 5th is the EmailBundle.

loImap = CreateObject('Chilkat.Imap')

loImap.Ssl = 1
loImap.Port = 993

lnSuccess = loImap.Connect("imap.example.com")
IF (lnSuccess = 0) THEN
    ? loImap.LastErrorText
    RELEASE loImap
    CANCEL
ENDIF

lnSuccess = loImap.Login("user@example.com","myPassword")
IF (lnSuccess = 0) THEN
    ? loImap.LastErrorText
    RELEASE loImap
    CANCEL
ENDIF

lnNumMessages = loImap.SelectMailbox("Inbox")
IF (lnNumMessages < 0) THEN
    ? loImap.LastErrorText
    RELEASE loImap
    CANCEL
ENDIF

*  Fetch messages 1..25 (or fewer if the mailbox is smaller).
lnCount = 25
IF (lnCount > lnNumMessages) THEN
    lnCount = lnNumMessages
ENDIF

loFailedSet = CreateObject('Chilkat.MessageSet')
loFetchedSet = CreateObject('Chilkat.MessageSet')
loBundle = CreateObject('Chilkat.EmailBundle')
lnSuccess = loImap.FetchChunk2(1,lnCount,loFailedSet,loFetchedSet,loBundle)
IF (lnSuccess = 0) THEN
    ? loImap.LastErrorText
    RELEASE loImap
    RELEASE loFailedSet
    RELEASE loFetchedSet
    RELEASE loBundle
    CANCEL
ENDIF

? "Fetched: " + STR(loFetchedSet.Count)
? "Failed:  " + STR(loFailedSet.Count)

lnSuccess = loImap.Disconnect()
IF (lnSuccess = 0) THEN
    ? loImap.LastErrorText
    RELEASE loImap
    RELEASE loFailedSet
    RELEASE loFetchedSet
    RELEASE loBundle
    CANCEL
ENDIF

RELEASE loImap
RELEASE loFailedSet
RELEASE loFetchedSet
RELEASE loBundle