Read Text at a String Offset from a Remote SFTP File

See more SFTP Examples

Demonstrates the Chilkat SFtp.ReadFileText64s method, which is like ReadFileText64 but takes the byte offset as a decimal string. The arguments are the handle, the offset string, the maximum number of bytes, and the charset.

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

async function chilkatExample() {
  // Demonstrates the SFtp.ReadFileText64s method, which is like ReadFileText64 but takes the byte
  // offset as a decimal string.  The 1st argument is the handle, the 2nd is the offset string, the
  // 3rd is the maximum number of bytes, and the 4th is the charset.

  const sftp = new SFtp();

  // Connect, authenticate, and initialize the SFTP subsystem.
  const port = 22;
  try {
    await sftp.connectAsync('sftp.example.com', port);
  } catch {
    console.log(sftp.lastErrorText);
    return;
  }

  // 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.
  const password = 'mySshPassword';

  try {
    await sftp.authenticatePwAsync('mySshLogin', password);
  } catch {
    console.log(sftp.lastErrorText);
    return;
  }

  try {
    await sftp.initializeSftpAsync();
  } catch {
    console.log(sftp.lastErrorText);
    return;
  }

  let handle: string;
  try {
    handle = await sftp.openFileAsync('subdir/hugefile.dat', 'readOnly', 'openExisting');
  } catch {
    console.log(sftp.lastErrorText);
    return;
  }

  // Supplying the offset as a string is convenient in languages without a native 64-bit integer.
  const offset = '5000000000';
  const numBytes = 6;
  let text: string;
  try {
    text = await sftp.readFileText64sAsync(handle, offset, numBytes, 'utf-8');
  } catch {
    console.log(sftp.lastErrorText);
    return;
  }

  console.log(text);

  try {
    await sftp.closeHandleAsync(handle);
  } catch {
    console.log(sftp.lastErrorText);
    return;
  }

  sftp.disconnect();
}