React Native

Append Bytes to a Remote FTP File (BinData)

Demonstrates the Chilkat Ftp2.AppendFileBd method, which appends the bytes in a BinData to a remote file. The first argument is the remote filename and the second is the BinData. No conversion is performed.

Background: The binary append: add in-memory bytes to the end of a remote file without an intermediate local file and without any encoding or line-ending translation. It is the right choice for growing a binary file — concatenating captured data, for instance — where exact bytes matter.

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import { BinData, Ftp2 } from '@chilkat/react-native'

async function chilkatExample() {
  // Demonstrates the Ftp2.AppendFileBd method, which appends the bytes in a BinData to a remote
  // file.  The 1st argument is the remote filename and the 2nd is the BinData.

  const ftp = new Ftp2();

  ftp.hostname = 'ftp.example.com';
  ftp.username = 'myFtpLogin';

  // Normally you would not hard-code the password in source.  You should instead obtain it
  // from an interactive prompt, environment variable, or a secrets vault.
  ftp.password = 'myPassword';

  try {
    await ftp.connectAsync();
  } catch {
    console.log(ftp.lastErrorText);
    return;
  }

  const bd = new BinData();
  try {
    bd.loadFile('qa_data/more_data.bin');
  } catch {
    console.log(bd.lastErrorText);
    return;
  }

  try {
    await ftp.appendFileBdAsync('data/collected.bin', bd);
  } catch {
    console.log(ftp.lastErrorText);
    return;
  }

  console.log(`Appended ${bd.numBytes} bytes.`);

  try {
    await ftp.disconnectAsync();
  } catch {
    console.log(ftp.lastErrorText);
    return;
  }
}