Dart

Check if a MIME Entity is multipart/related

Demonstrates the Chilkat Mime.IsMultipartRelated method, which returns whether the Content-Type is exactly multipart/related. It takes no arguments.

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

Background: multipart/related signals that the parts belong together — typically an HTML body plus the inline images it references by Content-ID. Detecting it tells your code the non-primary parts are embedded resources, not standalone attachments to list.

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Dart

import 'package:chilkat/chilkat.dart';

void main() {
  // Demonstrates the Mime.IsMultipartRelated method, which returns whether the Content-Type is multipart/related.  It takes no arguments.

  final mime = CkMime();
  try {
    mime.loadMimeFile('qa_data/multipart_message.eml');
  } on ChilkatException catch (e) {
    print(e.lastErrorText);
    return;
  }

  if (mime.isMultipartRelated()) {
    print('This is a multipart/related entity.');
  } else {
    print('This is not multipart/related.');
  }
}