Dart

Get a Header Field of a Related Item

Demonstrates the Chilkat Email.GetRelatedHeader method, which returns the value of a named header field of a related item. The first argument is the zero-based related-item index and the second is the MIME header-field name. This example reads the Content-Type header of a related style sheet.

Background: Each related item is a MIME part with its own header block. Where GetRelatedAttr extracts a single named parameter from a header, GetRelatedHeader returns the entire value of a header field — for example the full Content-Type or Content-Location line — which is handy for inspecting exactly how an embedded resource is described.

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Dart

import 'package:chilkat/chilkat.dart';

void main() {
  // Demonstrates the GetRelatedHeader method, which returns the value of a header field (by
  // name) of a related item.  The first argument is the zero-based related-item index and the
  // second is the MIME header-field name.

  final email = CkEmail();
  email.subject = 'GetRelatedHeader example';

  // Set an HTML body and add a related style sheet (index 0).
  email.setHtmlBody('<html><head><link rel="stylesheet" href="styles.css"/></head><body>Styled.</body></html>');
  email.addRelatedString2('styles.css', 'body { color: navy; }', 'utf-8');

  // Get the Content-Type header of the first related item (index 0).
  final ct = email.getRelatedHeader(0, 'Content-Type');
  print('Related item 0 Content-Type: $ct');
}