React Native

Get an FTP Listing Entry's Size as a String

Demonstrates the Chilkat Ftp2.GetSizeStr method, which returns the size in bytes of a cached directory-listing entry as a decimal string. The only argument is a zero-based index.

Background: Returning the size as text sidesteps integer-width limits entirely, which is useful in languages without a convenient 64-bit type and whenever you only need to display or log the value. Parse the string when you need to do arithmetic on it; otherwise it is ready to print as-is.

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React Native

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

async function chilkatExample() {
  // Demonstrates the Ftp2.GetSizeStr method, which returns the size in bytes of a cached
  // directory-listing entry as a decimal string.  The only argument is a zero-based index.

  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;
  }

  try {
    await ftp.changeRemoteDirAsync('public_html');
  } catch {
    console.log(ftp.lastErrorText);
    return;
  }

  // GetDirCount retrieves the directory listing on the first call and returns the number of
  // entries.  A negative return indicates failure.
  const n = await ftp.getDirCountAsync();
  if (n < 0) {
    console.log(ftp.lastErrorText);
    return;
  }

  for (let i = 0; i < n; i++) {
    const name = await ftp.getFilenameAsync(i);

    // The string form avoids integer-size limits in languages without a convenient 64-bit type.
    const fileSize = await ftp.getSizeStrAsync(i);
    console.log(`${name}  ${fileSize} bytes`);
  }

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