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(PHP ActiveX) Async Task ChainDemonstrates how to combine a sequence of asynchronous tasks into a single task chain to be run in a background thread.
<?php // All Chilkat classes can be unlocked at once at the beginning of a program // by calling UnlockBundle. It requires a Bundle unlock code. // For versions of Chilkat < 10.0.0, use new COM('Chilkat_9_5_0.Chilkat.Global') $chilkatGlob = new COM("Chilkat.Global"); $success = $chilkatGlob->UnlockBundle('Anything for 30-day trial.'); if ($success != 1) { print $chilkatGlob->LastErrorText . "\n"; exit; } // For versions of Chilkat < 10.0.0, use new COM('Chilkat_9_5_0.Chilkat.MailMan') $mailman = new COM("Chilkat.MailMan"); // Set the POP3 server's hostname $mailman->MailHost = 'pop.someMailServer.com'; // Set the POP3 login/password and any other requirements.. $mailman->PopUsername = 'myLogin'; $mailman->PopPassword = 'myPassword'; $mailman->PopSsl = 1; $mailman->MailPort = 995; // Connect to the POP3 server: $success = $mailman->Pop3BeginSession(); if (!$success) { print $mailman->LastErrorText . "\n"; exit; } // Get the number of messages in the mailbox. $numMessages = $mailman->GetMailboxCount(); if ($numMessages == 0) { print 'No email messages in the POP3 mailbox.' . "\n"; exit; } // For versions of Chilkat < 10.0.0, use new COM('Chilkat_9_5_0.Chilkat.TaskChain') $taskChain = new COM("Chilkat.TaskChain"); // Create async task objects to fetch each email message // by its sequence number for ($i = 1; $i <= $numMessages; $i++) { // task is a Chilkat.Task $task = $mailman->FetchByMsgnumAsync($i); if ($mailman->LastMethodSuccess == 0) { print $mailman->LastErrorText . "\n"; exit; } // Append each task to the task chain. $success = $taskChain->Append($task); if (!$success) { print $taskChain->LastErrorText . "\n"; exit; } } // At this point, no tasks have actually started running. // All we've done so far is to create tasks for the work that will be done // when the task chain is run. // Start the task chain running in a background thread. // Each task is run one after the other (on the same background thread) until all tasks have completed. // The task chain will stop at the first task that fails. $taskChain->StopOnFailedTask = 1; $success = $taskChain->Run(); if (!$success) { print $taskChain->LastErrorText . "\n"; exit; } // The application is now free to do anything else // while the emails are being downloaded // For this example, we'll simply sleep and periodically // check to see if the taskchain if finished. while ($taskChain->Finished != 1) { // Sleep 100 ms. $taskChain->SleepMs(100); } // A finished task chain could be one that was canceled, aborted, or truly finished. // If the task chain "completed", then it ran to completion. A "completed" task will // have a StatusInt equal to 7. If the task finished, but was not completed, then it must've // been aborted or canceled: if ($taskChain->StatusInt != 7) { print 'Task did not complete.' . "\n"; print 'task chain status: ' . $taskChain->Status . "\n"; exit; } // For versions of Chilkat < 10.0.0, use new COM('Chilkat_9_5_0.Chilkat.Email') $email = new COM("Chilkat.Email"); $numTasks = $taskChain->NumTasks; $taskIdx = 0; while (($taskIdx < $numTasks)) { // task is a Chilkat.Task $task = $taskChain->GetTask($taskIdx); // Load the email object with email downloaded by this task. $success = $email->LoadTaskResult($task); if (!$success) { print 'Failed to load email object for task.' . "\n"; } else { print $email->From . '; ' . $email->Subject . "\n"; } $taskIdx = $taskIdx + 1; } ?> |
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