Get IMAP Attachment Sizes

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Demonstrates the Chilkat Imap.GetMailAttachSize method, which returns the size in bytes of an attachment. The first argument is the Email and the second is the zero-based attachment index. This example fetches headers only and prints each attachment's name and size.

import 'package:chilkat/chilkat.dart';

void main() {
  // Demonstrates the Imap.GetMailAttachSize method, which returns the size in bytes of an
  // attachment.  The 1st argument is the Email and the 2nd is the zero-based attachment index.

  final imap = CkImap();

  imap.ssl = true;
  imap.port = 993;

  try {
    imap.connect('imap.example.com');
  } on ChilkatException catch (e) {
    print(e.lastErrorText);
    return;
  }

  try {
    imap.login('user@example.com', 'myPassword');
  } on ChilkatException catch (e) {
    print(e.lastErrorText);
    return;
  }

  try {
    imap.selectMailbox('Inbox');
  } on ChilkatException catch (e) {
    print(e.lastErrorText);
    return;
  }

  // Fetch only the message headers.  Attachment bodies are NOT downloaded, but the ckx-imap-*
  // metadata describing the attachments is present, so the attachment info methods still work.
  final headersOnly = true;
  final useUid = false;
  final seqNum = 1;
  final email = CkEmail();
  try {
    imap.fetchEmail(headersOnly, seqNum, useUid, email);
  } on ChilkatException catch (e) {
    print(e.lastErrorText);
    return;
  }

  final numAttach = imap.getMailNumAttach(email);
  for (var i = 0; i < numAttach; i++) {
    final String fname;
    try {
      fname = imap.getMailAttachFilename(email, i);
    } on ChilkatException catch (e) {
      print(e.lastErrorText);
      return;
    }

    final sz = imap.getMailAttachSize(email, i);
    print('$fname: $sz bytes');
  }

  try {
    imap.disconnect();
  } on ChilkatException catch (e) {
    print(e.lastErrorText);
    return;
  }
}