Getting Portable Devices using java

Question

I am trying to access some files in a device (having "windows CE" application in it) that appears as portable device in windows 7 using java applet....

My device path is like

 "Computer\Attari's Device\myfile.txt"

Now i am trying to access file from it using the same address but it gives path error or file not found.

Similarly i used

"\\.\Attari's Device\myfile.txt"

but it resulted in same error tell me how to access portable devices using java applet

When i navigate to connected device and right-click on file and see it's properties then it shows it's location as

Location:  Computer\Attari's Device

Also when i open this file it is automatically placed in temp files of my computer. I am using Signed Applet as well so there is no issue of file access denied

I also used

File.listRoots()

but it also does not list attached portable devices I have to write some file in portable device using java applet

When you navigate to the device and right click on the text file to bring up the properties, how is the path listed? Copy/paste it as an edit to the question. — Andrew Thompson, Oct 08 '12 at 05:12
@AndrewThompson it shows "Location: Computer\Attari's Device" now when i use "run" interface to access that device using above path it says file not found :( same is problem with java code see my edited question as well — Umair Aziz, Oct 08 '12 at 05:32
No, wherever you are getting that information is not what I mean. Do as I said, navigate to the file, right click (this is Windows, right?) bring up the properties **of the text file** and copy/paste the `Location:` field (it does not look selectable, but it is). — Andrew Thompson, Oct 08 '12 at 05:38
@AndrewThompson When i navigate to file in connected device in windows 7 and right-click on file and see it's properties then it shows it's location as Location: Computer\Attari's Device Also When i paste this location in Explorer i navigates to file successfully.. But this doesn't work in Run command and in my java applet code — Umair Aziz, Oct 08 '12 at 06:27

Umair Aziz · Accepted Answer · 2012-10-12T06:15:08.190

I found the solution to above problem using JMTP library on

http://code.google.com/p/jmtp/

Here is my code

    package jmtp;

import be.derycke.pieter.com.COMException;
import be.derycke.pieter.com.Guid;
import java.io.*;
import java.math.BigInteger;
import jmtp.PortableDevice;
import jmtp.*;

public class Jmtp {

    public static void main(String[] args) {
        PortableDeviceManager manager = new PortableDeviceManager();
        PortableDevice device = manager.getDevices()[0];
        // Connect to my mp3-player
        device.open();

        System.out.println(device.getModel());

        System.out.println("---------------");

        // Iterate over deviceObjects
        for (PortableDeviceObject object : device.getRootObjects()) {
            // If the object is a storage object
            if (object instanceof PortableDeviceStorageObject) {
                PortableDeviceStorageObject storage = (PortableDeviceStorageObject) object;

                for (PortableDeviceObject o2 : storage.getChildObjects()) {
//                    
//                        BigInteger bigInteger1 = new BigInteger("123456789");
//                        File file = new File("c:/JavaAppletSigningGuide.pdf");
//                        try {
//                            storage.addAudioObject(file, "jj", "jj", bigInteger1);
//                        } catch (Exception e) {
//                            //System.out.println("Exception e = " + e);
//                        }
//                    

                    System.out.println(o2.getOriginalFileName());
                }
            }
        }

        manager.getDevices()[0].close();

    }
}

Donot forget add jmtp.dll files (that comes up with jmtp download) as a native library for more info see my answer on

http://stackoverflow.com/questions/12798530/including-native-library-in-netbeans

Do you have any example of reading file? As it's returning file name only — Dinesh Falwadiya, Aug 27 '18 at 05:15
@DineshPhalwadiya Un-Comment the commented section in my above and change it according to your requirement — Umair Aziz, Sep 12 '18 at 06:34

Getting Portable Devices using java

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