Dart

Zip an Email's Attachments into One File

Demonstrates the Chilkat Email.ZipAttachments method, which replaces all of an email's attachments with a single Zip file attachment having the specified filename. The original attachments are removed and packed into the Zip. This example adds two attachments and zips them into one.

Background: Bundling multiple attachments into a single .zip keeps a message tidy, compresses the payload, and works around recipients or gateways that limit the number of attachments. Note that the filename here (files.zip) names the attachment inside the message — it is not a path on disk. The reverse operation is UnzipAttachments.

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Dart

import 'package:chilkat/chilkat.dart';

void main() {
  // Demonstrates the ZipAttachments method, which replaces all of an email's attachments
  // with a single Zip file attachment having the specified filename.  The original
  // attachments are removed and packed into the Zip.

  final email = CkEmail();
  email.subject = 'Zip the attachments';

  email.addStringAttachment('a.txt', 'first attachment');
  email.addStringAttachment('b.txt', 'second attachment');
  print('NumAttachments before = ${email.numAttachments}');

  // Replace all attachments with a single Zip attachment named "files.zip".
  try {
    email.zipAttachments('files.zip');
  } on ChilkatException catch (e) {
    print(e.lastErrorText);
    return;
  }

  print('NumAttachments after = ${email.numAttachments}');
}