Dart

Check if an FTP Listing Entry is a Directory

Demonstrates the Chilkat Ftp2.GetIsDirectory method, which returns whether a cached directory-listing entry is a directory. The only argument is a zero-based index. An invalid index returns false.

Background: Distinguishing directories from files is the first thing most listing code needs — to render a folder tree, to decide whether to recurse, or to apply different handling. This reads the type from the cached listing, so it is a local lookup rather than a server query. Reliability depends on the server's listing format conveying the type, which the common Unix and MLSD formats do.

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Dart

import 'package:chilkat/chilkat.dart';

void main() {
  // Demonstrates the Ftp2.GetIsDirectory method, which returns whether a cached directory-listing
  // entry is a directory.  The only argument is a zero-based index into the current listing.

  final ftp = CkFtp2();

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

  // 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;
  }

  try {
    ftp.changeRemoteDir('public_html');
  } on ChilkatException catch (e) {
    print(e.lastErrorText);
    return;
  }

  // GetDirCount retrieves the directory listing on the first call and returns the number of
  // entries.  A negative return indicates failure.
  final n = ftp.getDirCount();
  if (n < 0) {
    print(ftp.lastErrorText);
    return;
  }

  for (var i = 0; i < n; i++) {
    final name = ftp.getFilename(i);
    if (ftp.getIsDirectory(i)) {
      print('[DIR]  $name');
    } else {
      print('       $name');
    }
  }

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