Dart

Create a multipart/mixed MIME Entity

Demonstrates the Chilkat Mime.NewMultipartMixed method, which initializes the object as an empty multipart/mixed entity, clearing any existing content. It takes no arguments; child parts 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/mixed is the container for independent parts shown one after another — the classic "message body plus attachments" layout. Each child is its own distinct content, unlike multipart/alternative (competing renderings of the same thing) or multipart/related (a part and its embedded resources). Start here, then AppendPart a body and AppendPartFromFile the attachments.

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Dart

import 'package:chilkat/chilkat.dart';

void main() {
  // Demonstrates the Mime.NewMultipartMixed method, which initializes the object as an empty
  // multipart/mixed entity, clearing any existing headers, body, and child parts.  It takes no
  // arguments.

  final mime = CkMime();

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

  // Append child parts.  multipart/mixed is the container for a message body plus attachments.
  final bodyPart = CkMime();
  try {
    bodyPart.setBodyFromPlainText('See the attached report.');
  } on ChilkatException catch (e) {
    print(e.lastErrorText);
    return;
  }

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

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

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