React Native

Get an Alternative Body into a BinData

Demonstrates the Chilkat Email.GetAlternativeBodyBd method, which copies the contents of the Nth alternative body into a BinData object. The first alternative body is at index 0, and it should only be called when NumAlternatives is greater than 0. This example builds a message with plain-text and HTML alternatives and copies the first into a BinData.

Background: This is the binary counterpart to GetAlternativeBody (which returns text). Reading an alternative into a BinData preserves the exact bytes — important when a body part uses a binary or unusual transfer encoding, or when you intend to hash it or write it out verbatim rather than decode it to a string.

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React Native

import { BinData, Email } from '@chilkat/react-native'

function chilkatExample() {
  // Demonstrates the GetAlternativeBodyBd method, which copies the contents of the Nth
  // alternative body into a BinData object.  The first alternative body is at index 0; call
  // only when NumAlternatives is greater than 0.

  const email = new Email();
  email.subject = 'GetAlternativeBodyBd example';

  email.setTextBody('This is the plain-text alternative.', 'text/plain');
  email.addHtmlAlternativeBody('<html><body>This is the HTML alternative.</body></html>');

  // Copy the first alternative body (index 0) into a BinData object.
  const bd = new BinData();

  try {
    email.getAlternativeBodyBd(0, bd);
  } catch {
    console.log(email.lastErrorText);
    return;
  }

  console.log(`Alternative 0 size (bytes) = ${bd.numBytes}`);
}