React Native

Append Text to a Remote FTP File (StringBuilder)

Demonstrates the Chilkat Ftp2.AppendFileSb method, which encodes the text in a StringBuilder and appends the bytes to a remote file. The arguments are the remote filename, the StringBuilder, and the charset.

Background: When you have accumulated several lines or records in a StringBuilder, this appends them to a remote file in one call, encoding as it writes. It pairs naturally with building up text in memory and flushing it to a remote log periodically.

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React Native

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

async function chilkatExample() {
  // Demonstrates the Ftp2.AppendFileSb method, which encodes the text in a StringBuilder and
  // appends the bytes to a remote file.  The 1st argument is the remote filename, the 2nd is the
  // StringBuilder, and the 3rd is the charset.

  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 sb = new StringBuilder();
  sb.append('appended line one\n');
  sb.append('appended line two\n');

  try {
    await ftp.appendFileSbAsync('logs/app.log', sb, 'utf-8');
  } catch {
    console.log(ftp.lastErrorText);
    return;
  }

  console.log('Appended text.');

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