PHP ActiveX

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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<?php

$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.

$imap = new COM("Chilkat.Imap");

$imap->Ssl = 1;
$imap->Port = 993;

$success = $imap->Connect('imap.example.com');
if ($success == 0) {
    print $imap->LastErrorText . "\n";
    exit;
}

$success = $imap->Login('user@example.com','myPassword');
if ($success == 0) {
    print $imap->LastErrorText . "\n";
    exit;
}

$numMessages = $imap->SelectMailbox('Inbox');
if ($numMessages < 0) {
    print $imap->LastErrorText . "\n";
    exit;
}

//  Fetch messages 1..25 (or fewer if the mailbox is smaller).
$count = 25;
if ($count > $numMessages) {
    $count = $numMessages;
}

$failedSet = new COM("Chilkat.MessageSet");
$fetchedSet = new COM("Chilkat.MessageSet");
$bundle = new COM("Chilkat.EmailBundle");
$success = $imap->FetchChunk2(1,$count,$failedSet,$fetchedSet,$bundle);
if ($success == 0) {
    print $imap->LastErrorText . "\n";
    exit;
}

print 'Fetched: ' . $fetchedSet->Count . "\n";
print 'Failed:  ' . $failedSet->Count . "\n";

$success = $imap->Disconnect();
if ($success == 0) {
    print $imap->LastErrorText . "\n";
    exit;
}


?>