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
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
Related
I wrote a solution for renaming files, but nothing happens in Android 10, although in 11 and above it is renamed normally.
public class PathDiv {
public static String dev(String path){
return path.replaceAll("^(.*)/.*?$","$1");
}
public static void renameFilesInDir(String path, String dirIn, String ext) {
File checkFile = new File(path);
if (checkFile.isFile()) {
try {
checkFile.renameTo(new File(dirIn, ext));
} catch (Exception e) {
e.printStackTrace();
}
}
}
path: /storage/emulated/0/Music/04. Kasger - Highland.mp3 dirIn: /storage/emulated/0/Music ext: Highland.mp3
PathDiv.renameFilesInDir(songItem.realUri,PathDiv.dev(songItem.realUri),newName.toString())
What's the problem?
In Android 10 and Higher Version of android, you can't Rename or Delete directly.
For Rename or Delete a media file you want to send a request.
Here Read Android Official Document how to create a request
For your information, to Delete a media file Dependency Available here you can use it easily it's created by me
checkFile.renameTo(new File(dirIn, ext)); It Also Works for this you want to add ACTION_MANAGE_ALL_FILES_ACCESS_PERMISSION permission in your app but before using this permission please refer to Google Play Police Update
First of all I'm sorry if this question has been asked before or if there is documentation about the topic but i didn't found anything.
I want to make a windows app that open windows file explorer and you can browse for and then select a mp3 file, so you can play it (and replay it) in this program. I know how to open file explorer, this is my code :
import java.awt.Desktop;
import java.io.File;
import java.io.IOException;
public class Main
{
public static void main(String[] args) throws IOException {
Desktop desktop = Desktop.getDesktop();
File dirToOpen = null;
try {
dirToOpen = new File("c:\\");
desktop.open(dirToOpen);
} catch (IllegalArgumentException iae) {
System.out.println("File Not Found");
}
}
}
But i don't know how to select an mp3 file and then get the path of the file, so i can play it later.
I don't think you are approaching this right. You should use something like a FileDialog to choose a file:
FileDialog fd = new FileDialog(new JFrame());
fd.setVisible(true);
File[] f = fd.getFiles();
if(f.length > 0){
System.out.println(fd.getFiles()[0].getAbsolutePath());
}
Since you are only getting 1 MP3 file, you only need the first index of the File array returned from the getFiles() method. Since it is a modal dialog, the rest of your application will wait until after you choose a file. If you want to get multiple files at once, just loop through this aforementioned Files array.
See the documentation here: https://docs.oracle.com/javase/7/docs/api/java/awt/FileDialog.html
I have a desktop java app, and also an android app. Two app work together.
The user in desktop app have a button to launch the transfer between device data app to computer app and vice versa.
So I need to transfer data with a simple USB cable, and without internet connection/WiFi/Bluetooth/adb.
I found two Java MTP library that works on Windows to resolve my problem, and the USB Host/accesory fonctionnality of android:
jMTP successfully recognizes my Android devices, folder, and other things
I have success to transfer a file in computer ---> device, but i have an error when i try to transfer a file in device ---> computer
I put my code after the explaination.
jusbpmp but i don't have the possibility to transfer device ---> computer.
USB Host/accesory not usefull because transfer are launch from desktop app, and when i read on the android developper guide website, it seems to be not correspond from what i need, or maybe if the user start transfer from the device.
I try from 1 week to success in this task but it seems i need help.
Java + jMTP code
private static void jMTPeMethode()
{
PortableDeviceManager manager = new PortableDeviceManager();
PortableDevice device = manager.getDevices()[0];
// Connect to USB tablet
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())
{
if(o2.getOriginalFileName().equalsIgnoreCase("Test"))
{
//Device to computer not working
PortableDeviceToHostImpl32 copy = new PortableDeviceToHostImpl32();
try
{
copy.copyFromPortableDeviceToHost(o2.getID(), "C:\\TransferTest", device);
} catch (COMException ex)
{
}
// //Host to Device working
// BigInteger bigInteger1 = new BigInteger("123456789");
// File file = new File("c:/GettingJMTP.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();
}
This is the result of the code and the error
`
Nexus 9
---------------
Music
Podcasts
Ringtones
Alarms
Notifications
Pictures
Movies
Download
DCIM
Android
! Failed to get IStream (representing object data on the device) from IPortableDeviceResources, hr = 0x80070057
test
ReleveData
`
I read in internet 0x80070057 is a generic windows exception .
Edit:
Windows site say for the hr error
ERROR_INVALID_PARAMETER 0x80070057 :
The parameter supplied by the application is not valid.
But i don't see witch parameter is not valid
Here is the link of C class of the library use for transfer data device to computer, you can see my error line 230.
And this is the jMTP library i use.
Can you help me, or purpose an other way to do what i need(Usb4Java, libUSB) ? I shall be really grateful.
Thanks by advance.
Ok, i found the problem.
The problem come from o2.getID() parameter give to the methode copy.copyFromPortableDeviceToHost.
Because o2 representing the folder, and not the file in the folder, so it's not possible to send folder, for success i need to send file in folder.
So i cast my PortableDeviceObject o2 to an PortableDeviceFolderObject, so that get a list of child Object with targetFolder.getChildObjects() in the PortableDeviceFolderObject representing files' and then i can iterate on any child objet from the folder.
And for each file i call the methode copy.copyFromPortableDeviceToHost, with the right id.
Here is the correction code, copy/transfer file from computer to device and device to computer.
I hope it's help.
public class USBTransfertMain {
public static void main(String[] args) throws Throwable {
jMTPeMethode();
}
private static void jMTPeMethode()
{
PortableDeviceFolderObject targetFolder = null;
PortableDeviceManager manager = new PortableDeviceManager();
PortableDevice device = manager.getDevices()[0];
// Connect to USB tablet
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())
{
if(o2.getOriginalFileName().equalsIgnoreCase("testFolder"))
{
targetFolder = (PortableDeviceFolderObject) o2;
}
System.out.println(o2.getOriginalFileName());
}
copyFileFromComputerToDeviceFolder(targetFolder);
PortableDeviceObject[] folderFiles = targetFolder.getChildObjects();
for (PortableDeviceObject pDO : folderFiles) {
copyFileFromDeviceToComputerFolder(pDO, device);
}
}
}
manager.getDevices()[0].close();
}
private static void copyFileFromDeviceToComputerFolder(PortableDeviceObject pDO, PortableDevice device)
{
PortableDeviceToHostImpl32 copy = new PortableDeviceToHostImpl32();
try {
copy.copyFromPortableDeviceToHost(pDO.getID(), "C:\\TransferTest", device);
} catch (COMException ex) {
ex.printStackTrace();
}
}
private static void copyFileFromComputerToDeviceFolder(PortableDeviceFolderObject targetFolder)
{
BigInteger bigInteger1 = new BigInteger("123456789");
File file = new File("C:\\GettingJMTP.pdf");
try {
targetFolder.addAudioObject(file, "jj", "jj", bigInteger1);
} catch (Exception e) {
System.out.println("Exception e = " + e);
}
}
}
I'm using OpenCV for a object detection project. I'm trying to read frames from a stored video file using VideoCapture, but in OpenCV Java there is no current implementation. I followed instructions in this post: open video file with opencv java, to edit the source files of OpenCV Java to allow this functionality. The problem is I don't know how to recompile the files? - since I just added the downloaded opencv jar file into my eclipse project originally.
You should probably try JavaCV, an OpenCV wrapper for Java.
This post shows what you need to download/install to get things working on your system, but I'm sure you can find more updated posts around the Web.
One of the demos I present during my OpenCV mini-courses contains a source code that uses JavaCV to load a video file and display it on a window:
import static com.googlecode.javacv.cpp.opencv_core.*;
import static com.googlecode.javacv.cpp.opencv_imgproc.*;
import static com.googlecode.javacv.cpp.opencv_highgui.*;
import com.googlecode.javacv.OpenCVFrameGrabber;
import com.googlecode.javacv.FrameGrabber;
public class OpenCV_tut4
{
public static void main(String[] args)
{
FrameGrabber grabber = new OpenCVFrameGrabber("demo.avi");
if (grabber == null)
{
System.out.println("!!! Failed OpenCVFrameGrabber");
return;
}
cvNamedWindow("video_demo");
try
{
grabber.start(); // initialize video capture
IplImage frame = null;
while (true)
{
frame = grabber.grab(); // capture a single frame
if (frame == null)
{
System.out.println("!!! Failed grab");
break;
}
cvShowImage("video_demo", frame);
int key = cvWaitKey(33);
if (key == 27) // ESC was pressed, abort!
break;
}
}
catch (Exception e)
{
System.out.println("!!! An exception occurred");
}
}
}
i want to copy a file from a server to a client in java.this is my code up to now
import java.io.File;
import java.io.FileOutputStream;
import java.io.InputStream;
import java.net.URL;
public class Copy {
private ListDirectory dir = new ListDirectory();
public Copy() {
}
public String getCopyPath(String file) throws Exception {
String path = dir.getCurrentPath();
path += "\\" + file;
return path;
}
public void copyFile(String file) {
try {
File inputFile = new File(dir.getCurrentPath());
URL copyurl;
InputStream outputFile;
copyurl = new URL(getCopyPath(file));
outputFile = copyurl.openStream();
FileOutputStream out = new FileOutputStream(inputFile);
int c;
while ((c = outputFile.read()) != -1)
out.write(c);
outputFile.close();
out.close();
} catch (Exception e) {
System.out.println("Failed to Copy File from server");
e.printStackTrace();
}
}
public static void main(String args[]) {
String a = "put martin";
String b = a.substring(0, 3);
String c = a.substring(4);
System.out.println(a);
System.out.println(b);
System.out.println(c);
}
}
Problem is , the server is not uploadded online , but it is on my local drive, and the URL thing doesnt work. is there any other way? is this way correct? thanks
If you're expecting to access your file from the local file system (whether that be via network drive or a local disk), you'll need to treat this as if it is a straight file copy.
If you're expecting to access your file as if it is available for download from an HTTP server, you will need to treat it as an HTTP download (which is what it looks like you're trying to do with the URL).
If you want to test the HTTP download functionality using a file on your local system, just set up a simple HTTP server on your dev machine with a directory on your local system, and give your HTTP-downloading code a URL pointing to that local server (on http://localhost, or using your IP address).
Unfortunately, HTTP is a very different animal from a file system, and I don't think there's any way to use the same code to handle both scenarios. If you want your program to ultimately support both protocols, you should build methods/classes to handle both situations, and then have your program detect and use the appropriate protocol for a given path. You'll need to do the same for any other protocol you wish to support (FTP, SFTP, etc).