Dart

Add an Attachment from a BinData Object

Demonstrates the Chilkat Email.AddAttachmentBd method, which adds an attachment using the contents of a BinData object. The first argument is the attachment filename, the second is the BinData, and the third is the content type — if empty, it is inferred from the filename extension. This example loads a PDF into a BinData and attaches it.

Background: BinData is Chilkat's container for raw binary data. Attaching from a BinData is the right approach when the file's bytes are already in memory — generated on the fly, downloaded, or read from a database — rather than sitting on disk (which would use AddFileAttachment). Chilkat Base64-encodes the bytes into the message automatically.

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Dart

import 'package:chilkat/chilkat.dart';

void main() {
  // Demonstrates the AddAttachmentBd method, which adds an attachment using the contents of a
  // BinData object.  The first argument is the attachment filename, the second is the BinData
  // object, and the third is the content type (inferred from the filename extension if empty).

  final email = CkEmail();
  email.subject = 'Attach from BinData';
  email.body = 'Please see the attached file.';

  // Load a file into a BinData object, then attach it.
  final bd = CkBinData();
  try {
    bd.loadFile('qa_data/attachments/report.pdf');
  } on ChilkatException catch (e) {
    print(e.lastErrorText);
    return;
  }

  try {
    email.addAttachmentBd('report.pdf', bd, 'application/pdf');
  } on ChilkatException catch (e) {
    print(e.lastErrorText);
    return;
  }

  print('NumAttachments = ${email.numAttachments}');

  // Note: The path "qa_data/attachments/report.pdf" is a relative local filesystem path,
  // relative to the current working directory of the running application.
}