Dart

Set the Content-Disposition of an Attachment

Demonstrates the Chilkat Email.SetAttachmentDisposition method, which sets the Content-Disposition value for the attachment at a given zero-based index. The default disposition is attachment. This example changes an attachment's disposition to inline.

Background: The Content-Disposition header hints how a client should present a part: attachment means "offer it as a download," while inline means "display it within the message" (as an email client does with an embedded image). Setting it lets you control that behavior — though clients ultimately decide how to honor the hint.

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Dart

import 'package:chilkat/chilkat.dart';

void main() {
  // Demonstrates the SetAttachmentDisposition method, which sets the Content-Disposition
  // value for the attachment at the given zero-based index.  The default disposition is
  // "attachment".

  final email = CkEmail();
  email.subject = 'Set attachment disposition';

  email.addStringAttachment('image.txt', '(pretend inline content)');

  // Set the disposition of the first attachment (index 0) to "inline".
  try {
    email.setAttachmentDisposition(0, 'inline');
  } on ChilkatException catch (e) {
    print(e.lastErrorText);
    return;
  }

  // The attachment's Content-Disposition is now "inline".
  print(email.getMime());
}