(Java) FTP Iterate over Files in Directory Matching ListPattern

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Uses the ListPattern property to iterate over the files in a directory matching the pattern.

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import com.chilkatsoft.*;

public class ChilkatExample {

  static {
    try {
        System.loadLibrary("chilkat");
    } catch (UnsatisfiedLinkError e) {
      System.err.println("Native code library failed to load.\n" + e);
      System.exit(1);
    }
  }

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

    CkFtp2 ftp = new CkFtp2();

    ftp.put_Hostname("ftp.example.com");
    ftp.put_Username("my_login");
    ftp.put_Password("my_password");
    ftp.put_Port(21);
    ftp.put_AuthTls(true);

    boolean success = ftp.Connect();
    if (success != true) {
        System.out.println(ftp.lastErrorText());
        return;
        }

    // Change to the "images" sub-directory located under our FTP account's home directory.
    success = ftp.ChangeRemoteDir("images");
    if (success != true) {
        System.out.println(ftp.lastErrorText());
        return;
        }

    ftp.put_ListPattern("*.png");

    // Fetch the current remote directory contents by calling GetDirCount
    int n = ftp.GetDirCount();
    if (n < 0) {
        System.out.println(ftp.lastErrorText());
        return;
        }

    int i = 0;
    String filename;
    CkStringBuilder sbLocalPath = new CkStringBuilder();

    while (i < n) {
        filename = ftp.getFilename(i);
        System.out.println(filename);

        // Download this file.
        sbLocalPath.SetString("qa_output/");
        sbLocalPath.Append(filename);
        success = ftp.GetFile(filename,sbLocalPath.getAsString());
        if (success != true) {
            System.out.println(ftp.lastErrorText());
            return;
            }

        i = i+1;
        }
  }
}