Dart

Set a MIME Body from Binary Bytes (BinData)

Demonstrates the Chilkat Mime.SetBodyBd method, which sets the decoded body bytes from a BinData, changes the transfer encoding to base64, and preserves the bytes exactly. The only argument is the BinData.

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 direct way to put arbitrary binary content into a part from memory — a generated image, a decrypted blob — without a temporary file. Chilkat base64-encodes it so the bytes survive text-based transports unchanged. Note it does not set a Content-Type or disposition, so assign those yourself to describe what the bytes are.

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Dart

import 'package:chilkat/chilkat.dart';

void main() {
  // Demonstrates the Mime.SetBodyBd method, which sets the decoded body bytes from a BinData,
  // changes the transfer encoding to base64, and preserves the bytes exactly.  The only argument is
  // the BinData.

  // Put the binary body bytes into a BinData.
  final bd = CkBinData();
  try {
    bd.loadFile('qa_data/photo.jpg');
  } on ChilkatException catch (e) {
    print(e.lastErrorText);
    return;
  }

  final mime = CkMime();

  // Set a Content-Type for the binary content (SetBodyBd does not set one itself).
  mime.contentType = 'image/jpeg';

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

  print('Body set from ${bd.numBytes} bytes.');
}