Dart

Get a Remote FTP File's Size by Name

Demonstrates the Chilkat Ftp2.GetSizeByName method, which returns the size in bytes of a named file in the current remote directory as a 32-bit integer. The only argument is the filename — a name, not a path. It returns -1 when the file is not found or the size cannot be obtained.

Background: This is the direct way to get one file's size when you already know its name, typically via a SIZE command — no full directory listing required. Because the result is 32-bit, it cannot represent files past about 2 GB; use GetSizeStrByName for large files. The argument must be a bare filename in the current directory, so ChangeRemoteDir to the right place first.

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Dart

import 'package:chilkat/chilkat.dart';

void main() {
  // Demonstrates the Ftp2.GetSizeByName method, which returns the size in bytes of a named file in
  // the current remote directory as a 32-bit integer.  The only argument is the filename (a name,
  // not a path).

  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;
  }

  // Returns -1 when the file is not found or the size cannot be obtained.  For files that may
  // exceed 2 GB, use GetSizeStrByName (returns a decimal string).
  final fileSize = ftp.getSizeByName('report.pdf');
  if (fileSize < 0) {
    print('File not found, or size unavailable.');
    return;
  }

  print('report.pdf is $fileSize bytes');

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