Dart

Create a multipart/alternative MIME Entity

Demonstrates the Chilkat Mime.NewMultipartAlternative method, which initializes the object as an empty multipart/alternative entity. It takes no arguments; the alternative representations are then appended.

Background: multipart/alternative holds several renderings of the same content and lets the client pick the best one it can display — the standard way to send an email as both plain text and HTML. Order matters: parts go from least to most preferred, so the plain-text version comes first and the HTML last, and a client shows the last one it understands.

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Dart

import 'package:chilkat/chilkat.dart';

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

  final mime = CkMime();

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

  // multipart/alternative holds two representations of the SAME content; the client displays the
  // last one it can render.  Add a plain-text part, then an HTML part.
  final textPart = CkMime();
  try {
    textPart.setBodyFromPlainText('Hello (plain text version).');
  } on ChilkatException catch (e) {
    print(e.lastErrorText);
    return;
  }

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

  final htmlPart = CkMime();
  try {
    htmlPart.setBodyFromHtml('<html><body><b>Hello</b> (HTML version).</body></html>');
  } on ChilkatException catch (e) {
    print(e.lastErrorText);
    return;
  }

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

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