Dart

Restart/Resume FTP Download

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Resume downloading a file from an FTP server. Dart

import 'package:chilkat/chilkat.dart';

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

  final ftp = CkFtp2();

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

  // Connect and login to the FTP server.
  try {
    ftp.connect();
  } on ChilkatException catch (e) {
    print(e.lastErrorText);
    return;
  }

  // Change to the remote directory where the file is located.
  // This step is only necessary if the file is not in the root directory
  // for the FTP account.
  try {
    ftp.changeRemoteDir('temp');
  } on ChilkatException catch (e) {
    print(e.lastErrorText);
    return;
  }

  // To resume a download, it is assumed that the partial file
  // is already present on the local filesystem.
  // You only need to set the RestartNext property to resume
  // the download.  The Chilkat FTP component sets the resume
  // point by getting the existing size of the target (local) file.
  ftp.restartNext = true;

  final localFilename = 'big.zip';
  final remoteFilename = 'big.zip';

  // Resume downloading...
  try {
    ftp.getFile(remoteFilename, localFilename);
  } on ChilkatException catch (e) {
    print(e.lastErrorText);
    return;
  }

  ftp.disconnect();

  print('File Downloaded!');
}