React Native

Restart/Resume FTP Upload

See more FTP Examples

Demonstrates how to restart / resume an FTP upload. React Native

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

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

  const ftp = new Ftp2();

  ftp.hostname = 'ftp.example.com';
  ftp.username = 'login';
  ftp.password = 'password';

  // Connect and login to the FTP server.
  try {
    await ftp.connectAsync();
  } catch {
    console.log(ftp.lastErrorText);
    return;
  }

  // Change to the remote directory where the file will be uploaded.
  try {
    await ftp.changeRemoteDirAsync('temp');
  } catch {
    console.log(ftp.lastErrorText);
    return;
  }

  // In this example, assume that a previous FTP upload failed,
  // and the incomplete file (bigFile.zip) exists on the FTP server.
  // You only need to set the RestartNext property to resume
  // the upload.  When RestartNext is set, the next call
  // to PutFile (or PutFileFromBinaryData, PutFileFromTextData)
  // will automatically resume the upload from the point of failure.
  // (The way it works is that the FTP component sends a "SIZE";
  // command to the FTP server to find out how many bytes of
  // the file already exist on the server.  It then begins
  // uploading from that point.

  // Note: After PutFile is called, the RestartNext property
  // is automatically set to false.
  ftp.restartNext = true;

  // Upload a file with restart.
  const localFilename = 'bigFile.zip';
  const remoteFilename = 'bigFile.zip';

  try {
    await ftp.putFileAsync(localFilename, remoteFilename);
  } catch {
    console.log(ftp.lastErrorText);
    return;
  }

  await ftp.disconnectAsync();

  console.log('File Uploaded!');
}