Dart

Create a multipart/related MIME Entity

Demonstrates the Chilkat Mime.NewMultipartRelated method, which initializes the object as an empty multipart/related entity. It takes no arguments; the primary part and its related resources are then appended.

Note: The file paths are relative to the application's current working directory. Absolute paths may also be used. Supply the paths appropriate to your own environment.

Background: multipart/related ties a primary part to the resources it references — most commonly an HTML body and the inline images it embeds via cid: references. Unlike a plain attachment, a related image is displayed within the message rather than listed separately. The HTML part comes first, followed by each referenced resource with a matching Content-ID.

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Dart

import 'package:chilkat/chilkat.dart';

void main() {
  // Demonstrates the Mime.NewMultipartRelated method, which initializes the object as an empty
  // multipart/related entity, clearing any existing content.  It takes no arguments.

  final mime = CkMime();

  try {
    mime.newMultipartRelated();
  } on ChilkatException catch (e) {
    print(e.lastErrorText);
    return;
  }

  // multipart/related groups a primary part with the resources it references, such as an HTML body
  // and the inline images it displays.
  final htmlPart = CkMime();
  try {
    htmlPart.setBodyFromHtml('<html><body><img src="cid:logo"></body></html>');
  } on ChilkatException catch (e) {
    print(e.lastErrorText);
    return;
  }

  try {
    mime.appendPart(htmlPart);
  } on ChilkatException catch (e) {
    print(e.lastErrorText);
    return;
  }

  try {
    mime.appendPartFromFile('qa_data/logo.png');
  } on ChilkatException catch (e) {
    print(e.lastErrorText);
    return;
  }

  print('Number of parts: ${mime.numParts}');
}