Dart

Add Header Field to MIME Sub-Header in Email

See more Email Object Examples

Demonstrates how to add a header field to one of the attachment sub-headers in an email. Dart

import 'package:chilkat/chilkat.dart';

void main() {
  // This example requires the Chilkat API to have been previously unlocked.
  // See Global Unlock Sample for sample code.

  final email = CkEmail();

  email.subject = 'test';
  email.addTo('Chilkat', 'support@chilkatsoft.com');
  email.from = 'Matt <matt@example.com>';
  email.body = 'This is a simple plain-text body.';

  try {
    email.addFileAttachment2('qa_data/1.HPM', 'application/x-hprimnet');
  } on ChilkatException catch (e) {
    print(e.lastErrorText);
    return;
  }

  // Add a "ContentDescription: HPM/3.0" in the attachment's sub-header.
  // The 1st attachment is at index 0.
  email.addAttachmentHeader(0, 'Content-Description', 'HPM/3.0');

  // Show the email MIME:
  print(email.getMime());

  // This is the output:

  // MIME-Version: 1.0
  // Date: Wed, 16 Jan 2019 10:05:18 -0600
  // Message-ID: <93B88835586270B7BE5202F84E171F29C10BA935@CHILKATSLICE>
  // Content-Type: multipart/mixed; boundary="------------000502000000020502010608"
  // X-Priority: 3 (Normal)
  // Subject: test
  // To: Chilkat <support@chilkatsoft.com>
  // From: Matt <matt@example.com>
  // 
  // --------------000502000000020502010608
  // Content-Type: text/plain; charset=us-ascii; format=flowed
  // Content-Transfer-Encoding: 7bit
  // 
  // This is a simple plain-text body.
  // --------------000502000000020502010608
  // Content-Type: application/x-hprimnet; name="1.HPM"
  // Content-Transfer-Encoding: base64
  // Content-Disposition: attachment; filename="1.HPM"
  // Content-Description: HPM/3.0
  // 
  // FILE_DATA_IS_HERE...
  // 
  // --------------000502000000020502010608--
}