Android™

File Existence Check

See more FTP Examples

Testing to see if a file exists on the FTP server. The GetSizeByName method is a convenient way to check if a file exists. It will return -1 if the file does not exist, otherwise it returns the size of the file in bytes. Android™

// 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);

    boolean success = false;

    // 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("username");
    ftp.put_Password("password");

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

    // Set the current remote directory to where the file is located:
    success = ftp.ChangeRemoteDir("something");
    if (success != true) {
        Log.i(TAG, ftp.lastErrorText());
        return;
        }

    // Test to see if the file exists by getting the file size by name. 
    // If a -1 is returned, the file does not exist.
    int fileSize = ftp.GetSizeByName("test123.txt");
    if (fileSize < 0) {
        Log.i(TAG, "file does not exist");
        }
    else {
        Log.i(TAG, "file exists and is " + String.valueOf(fileSize) + " bytes in size");
        }

    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."
  }
}