React Native
Get the Binary Bytes of a MIME Body or Sub-Part Body

Demonstrates the GetBodyBinary method. The MIME data file used in this example is available at MIME Sample File.
Chilkat React Native Downloads

React Native
import { FileAccess, Mime } from '@chilkat/react-native'

function chilkatExample() {
  let success = false;

  // This example requires the Chilkat API to have been previously unlocked.
  // See Global Unlock Sample for sample code.

  const mime = new Mime();

  // The contents of this MIME file are shown below, 
  // and is also available at https://www.chilkatsoft.com/sampleMime.txt
  try {
    mime.loadMimeFile('qa_data/mime/sampleMime.txt');
  } catch {
    console.log(mime.lastErrorText);
    return;
  }

  // The MIME used in this example has the following nested structure
  // 
  // multipart/alternative
  //     text/plain
  //     multipart/related
  //         text/html
  //         image/jpeg
  // 

  // This example will get the JPG image data bytes.

  const mpRelated = new Mime();
  try {
    mime.partAt(1, mpRelated);
  } catch {
    console.log(mime.lastErrorText);
    return;
  }

  const pJpg = new Mime();
  try {
    mpRelated.partAt(1, pJpg);
  } catch {
    console.log(mpRelated.lastErrorText);
    return;
  }

  const jpgBytes = pJpg.getBodyBinary();

  // If these bytes are saved to a file, it will be a valid JPG image.
  const fac = new FileAccess();
  success = true;
  try {
    fac.writeEntireFile('qa_output/starfish20.jpg', jpgBytes);
  } catch {
    success = false;
  }
  console.log(`success = ${success}`);

  // --------------------------------------------------------------
  // --------------------------------------------------------------
  // The MIME sample file loaded at the beginning of this example
  // contains the following MIME:

  // Subject: Test email.
  // Content-Type: multipart/alternative;
  // 	boundary="------------DB171738719FB06D67DEBAA0"
  // MIME-Version: 1.0
  // 
  // --------------DB171738719FB06D67DEBAA0
  // Content-Type: text/plain; charset="utf-8"; format=flowed
  // Content-Transfer-Encoding: 7bit
  // 
  // This is a test.
  // 
  // --------------DB171738719FB06D67DEBAA0
  // Content-Type: multipart/related;
  // 	boundary="------------A940F1230E6F0105F03DB2CB"
  // 
  // --------------A940F1230E6F0105F03DB2CB
  // Content-Type: text/html; charset="utf-8"
  // Content-Transfer-Encoding: 8bit
  // 
  // <html><head>
  // <meta http-equiv="Content-Type" content="text/html; charset=utf-8">
  //   </head>
  //   <body bgcolor="#FFFFFF" text="#000000">
  //     <p>This is a test.&nbsp; <img src="cid:part1.E16AE3B4.1505C436@chilkatsoft.com" height="20" width="20"></p>
  //   </body>
  // </html>
  // 
  // --------------A940F1230E6F0105F03DB2CB
  // Content-Type: image/jpeg; name="starfish20.jpg"
  // Content-Transfer-Encoding: base64
  // Content-ID: <part1.E16AE3B4.1505C436@chilkatsoft.com>
  // Content-Disposition: inline; filename="starfish20.jpg"
  // 
  // /9j/4AAQSkZJRgABAQEASABIAAD//gAmRmlsZSB3cml0dGVuIGJ5IEFkb2JlIFBob3Rvc2hvcD8g
  // NC4w/9sAQwAQCwwODAoQDg0OEhEQExgoGhgWFhgxIyUdKDozPTw5Mzg3QEhcTkBEV0U3OFBtUVdf
  // YmdoZz5NcXlwZHhcZWdj/9sAQwEREhIYFRgvGhovY0I4QmNjY2NjY2NjY2NjY2NjY2NjY2NjY2Nj
  // Y2NjY2NjY2NjY2NjY2NjY2NjY2NjY2NjY2Nj/8IAEQgAFAAUAwERAAIRAQMRAf/EABcAAAMBAAAA
  // AAAAAAAAAAAAAAIDBAX/xAAYAQADAQEAAAAAAAAAAAAAAAABAgMEAP/aAAwDAQACEAMQAAAB2kZY
  // NNEijWKddfTmLgALWH//xAAbEAACAgMBAAAAAAAAAAAAAAABAgMRAAQSE//aAAgBAQABBQL0XqN+
  // pM2aqJGMiqFFCyg7z//EABwRAAICAgMAAAAAAAAAAAAAAAERAAIQIQMSUf/aAAgBAwEBPwHqU5aq
  // Axx+y1tMQl4elj//xAAcEQEAAQUBAQAAAAAAAAAAAAABEQACEBIhA1H/2gAIAQIBAT8B3Bhqy7Zc
  // enyiwmGgDhiOzj//xAAdEAABAwUBAAAAAAAAAAAAAAABAAIREBIhIkFR/9oACAEBAAY/ArZyn+Cg
  // xtxWuJaoCnqDuin/xAAcEAABBAMBAAAAAAAAAAAAAAABABEhYRAxQVH/2gAIAQEAAT8hkEwPUUR9
  // DYfE4nxtRpIkBTsayuALIiuY/9oADAMBAAIAAwAAABDWPTsf/8QAGhEAAwADAQAAAAAAAAAAAAAA
  // AAEREDFBIf/aAAgBAwEBPxC0DVPcWm+Ce4OesrkE6bjH/8QAGBEBAQEBAQAAAAAAAAAAAAAAAREA
  // QRD/2gAIAQIBAT8QahMiOc8YgSrnTY3ELclHXn//xAAcEAEBAAIDAQEAAAAAAAAAAAABEQAhMUFx
  // EFH/2gAIAQEAAT8Qn3igmSZSj+c4N4zapMy9IjFV98wncN2iuLFsCEbDGxQkI6RO/n//2Q==
  // 
  // --------------A940F1230E6F0105F03DB2CB--
  // 
  // --------------DB171738719FB06D67DEBAA0--
  // 
}