Tcl

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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Tcl


load ./chilkat.dll

set success 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.

set imap [new_CkImap]

CkImap_put_Ssl $imap 1
CkImap_put_Port $imap 993

set success [CkImap_Connect $imap "imap.example.com"]
if {$success == 0} then {
    puts [CkImap_lastErrorText $imap]
    delete_CkImap $imap
    exit
}

set success [CkImap_Login $imap "user@example.com" "myPassword"]
if {$success == 0} then {
    puts [CkImap_lastErrorText $imap]
    delete_CkImap $imap
    exit
}

set numMessages [CkImap_SelectMailbox $imap "Inbox"]
if {$numMessages < 0} then {
    puts [CkImap_lastErrorText $imap]
    delete_CkImap $imap
    exit
}

#  Fetch messages 1..25 (or fewer if the mailbox is smaller).
set count 25
if {$count > $numMessages} then {
    set count $numMessages
}

set failedSet [new_CkMessageSet]

set fetchedSet [new_CkMessageSet]

set bundle [new_CkEmailBundle]

set success [CkImap_FetchChunk2 $imap 1 $count $failedSet $fetchedSet $bundle]
if {$success == 0} then {
    puts [CkImap_lastErrorText $imap]
    delete_CkImap $imap
    delete_CkMessageSet $failedSet
    delete_CkMessageSet $fetchedSet
    delete_CkEmailBundle $bundle
    exit
}

puts "Fetched: [CkMessageSet_get_Count $fetchedSet]"
puts "Failed:  [CkMessageSet_get_Count $failedSet]"

set success [CkImap_Disconnect $imap]
if {$success == 0} then {
    puts [CkImap_lastErrorText $imap]
    delete_CkImap $imap
    delete_CkMessageSet $failedSet
    delete_CkMessageSet $fetchedSet
    delete_CkEmailBundle $bundle
    exit
}


delete_CkImap $imap
delete_CkMessageSet $failedSet
delete_CkMessageSet $fetchedSet
delete_CkEmailBundle $bundle