React Native

Get an Attachment's Bytes into a BinData

Demonstrates the Chilkat Email.GetAttachmentBd method, which copies an attachment's binary data into a BinData object. The first attachment is at index 0. This example adds an attachment and copies its bytes into a BinData, printing the byte count.

Background: This is the safe, binary way to extract an attachment — the counterpart to the text-oriented GetAttachmentString. Because attachments are often binary (PDFs, images, archives), copying the raw bytes into a BinData preserves them exactly, ready to write to a file, hash, or pass to another API without any charset conversion that could corrupt the data.

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React Native

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

function chilkatExample() {
  // Demonstrates the GetAttachmentBd method, which copies an attachment's binary data into a
  // BinData object.  The first attachment is at index 0.

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

  email.addStringAttachment('notes.txt', 'Some notes stored in the attachment.');

  // Copy the first attachment's binary data into a BinData object.
  const bd = new BinData();
  try {
    email.getAttachmentBd(0, bd);
  } catch {
    console.log(email.lastErrorText);
    return;
  }

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