(Android™) Delete Local Files that Do Not Exist on the FTP Server

Demonstrates how to get a list of local files in a directory tree that do not exist on the FTP server.

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 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();

    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;
        }

    // Set the current remote directory to the root of
    // the remote tree to be compared.
    success = ftp.ChangeRemoteDir("abc123");
    if (success != true) {
        Log.i(TAG, ftp.lastErrorText());
        return;
        }

    // Recursively descend the local directory tree
    // and find the files that exist locally but not remotely.
    // These are the files what would be uploaded via
    // the SyncRemoteTree method call with mode = 1.
    // (Mode 1 would upload all files that do not exist on the FTP server.)

    // The actual uploading is avoided by setting the preview-only argument to true.
    int mode = 1;
    boolean descendTree = true;
    boolean previewOnly = true;
    success = ftp.SyncRemoteTree2("/temp/abc123",mode,descendTree,previewOnly);
    if (success != true) {
        Log.i(TAG, ftp.lastErrorText());
        return;
        }

    // The files what would've been uploaded are now available in the SyncPreview property,
    // which contains a list of local file paths, one per line.
    // A program can iterate over them like this:
    CkStringArray sa = new CkStringArray();
    sa.LoadFromText(ftp.syncPreview());

    CkFileAccess fac = new CkFileAccess();

    int numFiles = sa.get_Count();
    int i = 0;
    String localFilePath;
    while ((i < numFiles)) {
        localFilePath = sa.getString(i);
        Log.i(TAG, localFilePath);

        // An application can delete the file using Chilkat's file access object,
        // or it can choose to use the native file API available in the programming language:
        success = fac.FileDelete(localFilePath);
        if (success != true) {
            Log.i(TAG, "Failed to delete: " + localFilePath);
            }

        i = i + 1;
        }

    success = 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."
  }
}