React Native

Check if File Exists

See more SFTP Examples

Demonstrates how to check to see if a file exists. React Native

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

async function chilkatExample() {
  // This example assumes the Chilkat API to have been previously unlocked.
  // See Global Unlock Sample for sample code.

  const sftp = new SFtp();

  // Connect to the SSH server.  
  const hostname = 'sftp.example.com';
  const port = 22;
  try {
    await sftp.connectAsync(hostname, port);
  } catch {
    console.log(sftp.lastErrorText);
    return;
  }

  // Authenticate with the SSH server.  Chilkat SFTP supports
  // both password-based authenication as well as public-key
  // authentication.  This example uses password authenication.
  try {
    await sftp.authenticatePwAsync('myLogin', 'myPassword');
  } catch {
    console.log(sftp.lastErrorText);
    return;
  }

  // After authenticating, the SFTP subsystem must be initialized:
  try {
    await sftp.initializeSftpAsync();
  } catch {
    console.log(sftp.lastErrorText);
    return;
  }

  // Check to see if a file exists

  // The return value is one of the following values:
  // -1: Unable to check. Examine the LastErrorText to determine the reason for failure.
  // 0: File does not exist.
  // 1: The regular file exists.
  // 2: It exists, but it is a directory.
  // 3: It exists, but it is a symlink (only possible if followLinks is false)
  // 4: It exists, but it is a special filesystem entry type.
  // 5: It exists, but it is an unkown filesystem entry type.
  // 6: It exists, but it is an socket filesystem entry type.
  // 7: It exists, but it is an char device entry type.
  // 8: It exists, but it is an block device entry type.
  // 9: It exists, but it is an FIFO entry type.

  const followLinks = true;
  const status = await sftp.fileExistsAsync('someDir/someFile.txt', followLinks);
  if (status < 0) {
    console.log(sftp.lastErrorText);
    return;
  }

  console.log(`status = ${status}`);

  console.log('Success');
}