Dart

Get the Content-Type of a Related Item

Demonstrates the Chilkat Email.GetRelatedContentType method, which returns the Content-Type of the Nth related content item in an email. The index is zero-based. This example adds a related style sheet and reads its content type.

Background: Each related item declares a Content-Type — image/png for an inline image, text/css for a style sheet, and so on — that tells the rendering client how to use it. Reading the content type lets a program enumerate a message's embedded resources and act on them by kind, for example collecting every inline image while ignoring the style sheets.

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Dart

import 'package:chilkat/chilkat.dart';

void main() {
  // Demonstrates the GetRelatedContentType method, which returns the Content-Type of the Nth
  // related content item in an email.  The index is zero-based.

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

  // The HTML references the style sheet by name (Content-Location).
  email.setHtmlBody('<html><head><link rel="stylesheet" href="styles.css"/></head><body>Styled.</body></html>');

  // Add the related style sheet (index 0).
  email.addRelatedString2('styles.css', 'body { color: navy; }', 'utf-8');

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