Dart

FTP Automatic Post-Connect Commands

Demonstrates the AutoFeat, AutoSyst, AutoOptsUtf8, and AutoXcrc properties, which control commands Chilkat issues automatically around connecting and transferring.

Background: Chilkat normally probes and adapts to a server on its own: AutoFeat discovers capabilities with FEAT, AutoSyst learns the OS type to parse legacy listings, and AutoOptsUtf8 enables UTF-8 filenames when the server advertises it. These are on by default and rarely worth changing. AutoXcrc is the exception worth enabling deliberately — it verifies each upload with the server's XCRC checksum, catching corruption automatically where supported.

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Dart

import 'package:chilkat/chilkat.dart';

void main() {
  final ftp = CkFtp2();

  ftp.hostname = 'ftp.example.com';
  ftp.username = 'myFtpLogin';

  // These auto-* properties control commands Chilkat sends automatically after connecting.  They
  // are on/off by default as noted, and are rarely changed.

  // AutoFeat (default true): automatically send FEAT to discover server capabilities.
  ftp.autoFeat = true;

  // AutoSyst (default true): automatically send SYST after login to learn the server OS type.
  ftp.autoSyst = true;

  // AutoOptsUtf8 (default true): send OPTS UTF8 ON when the FEAT response advertises UTF8.
  ftp.autoOptsUtf8 = true;

  // AutoXcrc (default false): request an XCRC checksum after each upload and treat a mismatch as
  // a failure, giving automatic post-upload verification where the server supports XCRC.
  ftp.autoXcrc = true;

  // 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.
  ftp.password = 'myPassword';

  try {
    ftp.connect();
  } on ChilkatException catch (e) {
    print(e.lastErrorText);
    return;
  }

  print('Connected with the configured automatic features.');

  try {
    ftp.disconnect();
  } on ChilkatException catch (e) {
    print(e.lastErrorText);
    return;
  }
}