Dart

Set a MIME Body from a File

Demonstrates the Chilkat Mime.SetBodyFromFile method, which reads a local file and sets it as the body, choosing content headers from the filename extension. The only argument is the file path.

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: This is the one-call way to turn a file into a MIME part: Chilkat reads the bytes and infers the Content-Type and transfer encoding from the extension — .jpg becomes image/jpeg with base64, .txt a text type, and so on. It is the natural building block for adding an attachment, usually followed by setting a Content-Disposition and filename.

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Dart

import 'package:chilkat/chilkat.dart';

void main() {
  // Demonstrates the Mime.SetBodyFromFile method, which reads a local file and sets it as the body,
  // choosing content headers based on the filename extension.  The only argument is the file path.

  final mime = CkMime();

  // The Content-Type and encoding are set from the ".jpg" extension (image/jpeg, base64).
  try {
    mime.setBodyFromFile('qa_data/photo.jpg');
  } on ChilkatException catch (e) {
    print(e.lastErrorText);
    return;
  }

  print('Content-Type: ${mime.contentType}');
  print('Encoding: ${mime.encoding}');
}