Download the Full Version of a Partial Email

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Demonstrates the Chilkat MailMan.FetchFull method, which downloads the complete version of a header-only or partial Email and stores it in a second Email. The full result includes the complete body and any attachments, and the partial email must retain its UIDL. This example previews message 1 (headers only) and then downloads it in full.

import { Email, MailMan } from '@chilkat/react-native'

async function chilkatExample() {
  // Demonstrates the MailMan.FetchFull method, which downloads the complete version of a
  // header-only or partial Email and stores it in a second Email.  The full result includes
  // the complete body and any attachments.  The partial email must retain its UIDL.

  const mailman = new MailMan();

  // Configure the POP3 server connection.
  mailman.mailHost = 'pop.example.com';
  mailman.mailPort = 995;
  mailman.popSsl = true;
  mailman.popUsername = 'user@example.com';
  mailman.popPassword = 'myPassword';

  // First fetch message 1 as headers only (a fast preview).  headerOnly=true.
  const partialEmail = new Email();

  try {
    await mailman.fetchOneAsync(true, 0, 1, partialEmail);
  } catch {
    console.log(mailman.lastErrorText);
    return;
  }

  console.log(`Preview subject: ${partialEmail.subject}`);

  // Now download the complete message (body and attachments).
  const fullEmail = new Email();
  try {
    await mailman.fetchFullAsync(partialEmail, fullEmail);
  } catch {
    console.log(mailman.lastErrorText);
    return;
  }

  console.log(`Full email NumAttachments: ${fullEmail.numAttachments}`);

  // Note: Explicitly connecting/authenticating is optional.  Chilkat MailMan automatically
  // connects and authenticates -- using the property settings above -- whenever a server
  // operation requires it.  Calling the explicit connect/authenticate methods can still be
  // helpful to determine whether a failure occurs while connecting or while authenticating.
}