Dart

Repair MIME Formatting Problems in an Email

Demonstrates the Chilkat Email.ApplyFixups method, which repairs selected MIME-formatting problems commonly found in email produced by other software. The argument is a comma-separated list of fixup keywords. The currently defined keyword is FixRelated, which relocates HTML-related items (such as embedded images) into the appropriate MIME structure so they are not incorrectly presented as ordinary attachments. This example loads an email and applies that fixup.

Background: Not every mail program builds strictly correct MIME. A common defect is placing an inline image as a loose attachment instead of nesting it in a multipart/related enclosure, which makes it show up as a downloadable file rather than displaying in the HTML. ApplyFixups corrects such structural issues so the message renders as intended.

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Dart

import 'package:chilkat/chilkat.dart';

void main() {
  // Demonstrates the ApplyFixups method, which repairs selected MIME-formatting problems
  // commonly found in email produced by other software.  The argument is a comma-separated
  // list of fixup keywords.

  final email = CkEmail();

  try {
    email.loadEml('qa_data/eml/message.eml');
  } on ChilkatException catch (e) {
    print(e.lastErrorText);
    return;
  }

  // Apply the "FixRelated" fixup, which relocates HTML-related items (such as embedded
  // images) into the proper MIME structure so they are not shown as ordinary attachments.
  try {
    email.applyFixups('FixRelated');
  } on ChilkatException catch (e) {
    print(e.lastErrorText);
    return;
  }

  print('Applied MIME fixups.');

  // Note: The path "qa_data/..." is a relative local filesystem path,
  // relative to the current working directory of the running application.
}