(Java) FTP Download Binary File to a Stream

Demonstrates how to FTP download a binary file to a Chilkat stream.

Note: This example requires Chilkat v9.5.0.67 or greater.

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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 assumes the Chilkat FTP2 API to have been previously unlocked.
    // See FTP2 Unlock Sample for sample code.

    CkFtp2 ftp = new CkFtp2();

    ftp.put_Hostname("www.my-ftp-server.com");
    ftp.put_Username("mFtpLogin");
    ftp.put_Password("myFtpPassword");
    ftp.put_AuthTls(true);
    ftp.put_Passive(true);

    // Connect and login to the FTP server using TLS.
    boolean success = ftp.Connect();
    if (success != true) {
        System.out.println(ftp.lastErrorText());
        return;
        }

    // We'll read the incoming data chunk-by-chunk and write to an output file.
    CkFileAccess fac = new CkFileAccess();
    success = fac.OpenForWrite("qa_output/penguins2.jpg");
    if (success != true) {
        System.out.println(fac.lastErrorText());
        return;
        }

    CkStream streamObj = new CkStream();

    // Create a task to do the FTP download.
    CkTask t = ftp.GetFileToStreamAsync("penguins2.jpg",streamObj);
    if (ftp.get_LastMethodSuccess() != true) {
        System.out.println(ftp.lastErrorText());
        return;
        }

    // Start the task in a background thread.
    t.Run();

    CkBinData bd = new CkBinData();
    while (streamObj.get_EndOfStream() != true) {
        // Get the next chunk of JPG bytes.
        streamObj.ReadBd(bd);
        // Do something with it..
        // In this simple example, we'll just write to the file.
        fac.FileWriteBd(bd,0,0);
        // Clear for the next read.
        bd.Clear();
        }

    fac.FileClose();

    System.out.println("Success.");
  }
}