Dart

Check if a MIME Part is HTML

Demonstrates the Chilkat Mime.IsHtml method, which returns whether the Content-Type is exactly text/html. It takes no arguments and applies to the current part.

Note: The file path is relative to the application's current working directory. Absolute paths may also be used. Supply the path to your own file.

Background: Finding the HTML part is the common goal when rendering a message richly — it is the formatted version a mail client prefers. In a multipart/alternative you would locate it with this predicate and fall back to the plain-text part when it is absent.

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Dart

import 'package:chilkat/chilkat.dart';

void main() {
  // Demonstrates the Mime.IsHtml method, which returns whether the Content-Type is text/html.  It takes no arguments and applies to the current
  // part.  This example iterates the parts of a multipart message and reports which ones match.

  final mime = CkMime();
  try {
    mime.loadMimeFile('qa_data/multipart_message.eml');
  } on ChilkatException catch (e) {
    print(e.lastErrorText);
    return;
  }

  final n = mime.numParts;
  final partVar = CkMime();
  for (var i = 0; i < n; i++) {
    try {
      mime.partAt(i, partVar);
    } on ChilkatException catch (e) {
      print(e.lastErrorText);
      return;
    }

    if (partVar.isHtml()) {
      print('Part $i (${partVar.contentType}) is HTML.');
    }
  }
}