React Native

FTP Non-Recursive Sync Directory (Download)

See more FTP Examples

Download files from the server that have filenames matchhing a pattern, and don't yet exist in a local directory. React Native

import { Ftp2, StringTable } 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 = 'myUsername';
  ftp.password = 'myPassword';
  ftp.port = 21;
  ftp.authTls = true;

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

  // Change to the remote directory where the files are located.
  // This step is only necessary if the files are not in the root directory
  // of the FTP account.
  try {
    await ftp.changeRemoteDirAsync('qa');
  } catch {
    console.log(ftp.lastErrorText);
    return;
  }

  // Indicate that we only want to download files with filenames ending in ".txt"
  ftp.syncMustMatch = '*.txt';

  // Modes for synchronization are as follows:
  // mode=0: Download all files
  // mode=1: Download all files that do not exist on the local filesystem.
  // mode=2: Download newer or non-existant files.
  // mode=3: Download only newer files. If a file does not already exist on the local filesystem, it is not downloaded from the server.
  // mode=5: Download only missing files or files with size differences.
  // mode=6: Same as mode 5, but also download newer files.
  // mode=99: Do not download files, but instead delete remote files that do not exist locally.
  const mode = 1;

  // Download all files matching "*.txt" from the current remote ftp directory.
  // The files are downloaded into c:/temp/qa_output
  try {
    await ftp.syncLocalDirAsync('c:/temp/qa_output', mode);
  } catch {
    console.log(ftp.lastErrorText);
    return;
  }

  // Perhaps we wish to delete the files we just downloaded from the server..
  const st = new StringTable();
  ftp.getSyncedFiles(st);

  const numFiles = st.count;
  let i = 0;
  let remoteFilename = '';
  while (i < numFiles) {
    remoteFilename = st.stringAt(i);
    console.log(`Deleting ${remoteFilename} from the FTP server`);
    try {
      await ftp.deleteRemoteFileAsync(remoteFilename);
    } catch {
      console.log(ftp.lastErrorText);
      return;
    }

    i++;
  }

  await ftp.disconnectAsync();
}