(Android™) ProgressMonSize Property

Demonstrates the case where the ProgressMonSize property is required to monitor the progress of FTP downloads.

When a file is downloaded, most FTP servers will indicate the file size in the intermediate "150" response. For example:

RETR hamlet.xml
150 Opening BINARY mode data connection for hamlet.xml (279658 Bytes).
226 Transfer complete.

However, some FTP servers do not provide the file size. For example, from a FileZilla server:

RETR files.txt
150 Connection accepted
226 Transfer OK

If the file size is not present, the component does not know how many bytes are forthcoming, and therefore it is not possible to monitor percentage completion progress -- unless the application provides a little help by setting the ProgressMonSize property just prior to calling GetFile.

The application should set the ProgressMonSize to the size indicated by GetSizeByName as demonstrated in this example.

Chilkat Android™ Downloads Android™ Java Libraries Android C/C++ Libraries

// Important: Don't forget to include the call to System.loadLibrary
// as shown at the bottom of this code sample.
package com.test;

import android.app.Activity;
import com.chilkatsoft.*;

import android.widget.TextView;
import android.os.Bundle;

public class ftpProgress extends CkFtp2Progress
  {

  public boolean PercentDone(int percentDone)
    {
    boolean abort = false;
    Log.i(TAG, "Percent Done: " + String.valueOf(percentDone));
    // Return true to abort, false to continue.
    return abort;
    }

  public void ProgressInfo(String name, String value)
    {
    Log.i(TAG, name + ": " + value);
    return;
    }

};

public class SimpleActivity extends Activity {

  private static final String TAG = "Chilkat";

  // Called when the activity is first created.
  @Override
  public void onCreate(Bundle savedInstanceState) {
    super.onCreate(savedInstanceState);

    // This example requires the Chilkat API to have been previously unlocked.
    // See Global Unlock Sample for sample code.

    CkFtp2 ftp = new CkFtp2();
    ftpProgress ftp_progress = new ftpProgress();
    ftp.put_EventCallbackObject(ftp_progress);

    ftp.put_Hostname("ftp.example.com");
    ftp.put_Username("login");
    ftp.put_Password("password");

    ftp.put_KeepSessionLog(true);

    // Connect and login to the FTP server.
    boolean success = ftp.Connect();
    if (success != true) {
        Log.i(TAG, ftp.lastErrorText());
        return;
        }

    // Change to the remote directory where the file is located.
    // This step is only necessary if the file is not in the root directory
    // for the FTP account.
    success = ftp.ChangeRemoteDir("junk");
    if (success != true) {
        Log.i(TAG, ftp.lastErrorText());
        return;
        }

    // Download a file.
    String localFilename = "hamlet.xml";
    String remoteFilename = "hamlet.xml";

    // If the FTP server does not supply the file size in the "150"
    // intermediate response (to the RETR command), then tell
    // the component how many bytes are forthcoming (if your
    // application wishes to monitor the progress as a percentage
    // completion).
    int fileSize = ftp.GetSizeByName(remoteFilename);
    ftp.put_ProgressMonSize(fileSize);

    success = ftp.GetFile(remoteFilename,localFilename);
    if (success != true) {
        Log.i(TAG, ftp.lastErrorText());
        return;
        }

    Log.i(TAG, ftp.sessionLog());

    ftp.Disconnect();

  }

  static {
      System.loadLibrary("chilkat");

      // Note: If the incorrect library name is passed to System.loadLibrary,
      // then you will see the following error message at application startup:
      //"The application <your-application-name> has stopped unexpectedly. Please try again."
  }
}