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(Node.js) Async Methods Returning an ObjectDemonstrates how to call an asynchronous method that returns an object. This example reads email from a POP3 server using the Async versions of the Chilkat methods.
var os = require('os'); if (os.platform() == 'win32') { var chilkat = require('chilkat_win32'); } else if (os.platform() == 'linux') { if (os.arch() == 'x86') { var chilkat = require('chilkat_linux32'); } else { var chilkat = require('chilkat_linux64'); } } else if (os.platform() == 'darwin') { var chilkat = require('chilkat_macosx'); } function chilkatExample() { // All Chilkat classes can be unlocked at once at the beginning of a program // by calling UnlockBundle. It requires a Bundle unlock code. var chilkatGlob = new chilkat.Global(); var success = chilkatGlob.UnlockBundle("Anything for 30-day trial."); if (success != true) { console.log(chilkatGlob.LastErrorText); return; } var mailman = new 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 = true; mailman.MailPort = 995; // Connect to the POP3 server: // task: Task var task = mailman.Pop3BeginSessionAsync(); if (task == null ) { console.log(mailman.LastErrorText); return; } // Start the background task. success = task.Run(); if (!success) { console.log(task.LastErrorText); return; } // Wait for the POP3 connect task to finish. // The true/false returned by Wait applies to the Wait method call, not the task. var maxWaitMs = 30000; success = task.Wait(maxWaitMs); if (!success || (task.StatusInt != 7) || (task.TaskSuccess != true)) { if (!success) { // The task.LastErrorText applies to the Wait method call. console.log(task.LastErrorText); } else { // The ResultErrorText applies to the underlying task method call (i.e. the Pop3BeginSession) console.log(task.Status); console.log(task.ResultErrorText); } return; } // Get the number of messages in the mailbox. task = mailman.GetMailboxCountAsync(); // To keep the example short, we'll skip handling failures. // The failures would be handled in the same way as shown above. success = task.Run(); success = task.Wait(maxWaitMs); var numMessages = task.GetResultInt(); if (numMessages == 0) { return; } var email = new chilkat.Email(); var i; for (i = 1; i <= numMessages; i++) { task = mailman.FetchByMsgnumAsync(i); if (task == null ) { console.log(mailman.LastErrorText); return; } success = task.Run(); success = task.Wait(maxWaitMs); if (!success || (task.StatusInt != 7) || (task.TaskSuccess != true)) { if (!success) { // The task.LastErrorText applies to the Wait method call. console.log(task.LastErrorText); } else { // The ResultErrorText applies to the underlying task method call (i.e. the FetchByMsgnum) console.log(task.Status); console.log(task.ResultErrorText); } return; } // Each Chilkat object that can be a return value of an asynchronous task will // have a method named LoadTaskResult. The object returned in the underlying // asynchronous method call is retrieved by calling LoadTaskResult. // To say it another way: The application will provide a pre-existing object of // the desired return type (in this case it is an email object). This object is // loaded by calling LoadTaskResult. success = email.LoadTaskResult(task); if (!success) { console.log(email.LastErrorText); return; } else { console.log(email.From + ": " + email.Subject + "\n"); } } } chilkatExample(); |
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