(Android™) Directory Existence Check

How to test if a directory exists on an FTP server.

A good way to check to see if a directory already exists is to try to "cd" to that remote directory by calling ChangeRemoteDir. If it succeeds, then the directory exists. If not, then it does not exist. An alternative method is to set the ListPattern = "*" and then iterate over the files/directories, looking for the directory.

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");

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

    // Does the "temp" directory exist?
    boolean dirExists;
    dirExists = ftp.ChangeRemoteDir("/temp");
    if (dirExists == true) {
        Log.i(TAG, "Yes, the temp directory exists.");
        //  Yes, it exists. Restore the current remote dir:
        success = ftp.ChangeRemoteDir("..");
        if (success != true) {
            Log.i(TAG, ftp.lastErrorText());
            return;
            }

        }

    // Alternatively, you may set the ListPattern = "*" and 
    //  look for the directory:
    ftp.put_ListPattern("*");

    int i;
    int n;
    n = ftp.GetDirCount();
    if (n < 0) {
        // Failed to get directory listing based on ListPattern
        Log.i(TAG, ftp.lastErrorText());
        return;
        }

    if (n > 0) {
        for (i = 0; i <= n - 1; i++) {
            boolean isDir;
            isDir = ftp.GetIsDirectory(i);
            if (isDir == true) {
                String fname;
                fname = ftp.getFilename(i);
                if (fname == "temp") {
                    Log.i(TAG, "Found temp directory!");
                    success = ftp.Disconnect();
                    return;
                    }

                }

            }

        }

    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."
  }
}