How to convert a Image object to byte Array?

Who can tell me, how to convert Image object to byte Array?
Example:
public byte[] convertImage(Image img) {
byte[] b = new byte...........
return b;

Hello,
any way would suit me, I just need a way to convert Image or BufferedImage to a byte[], so that I can save them. Actually I need to save both jpg and gif files without using any 3rd party classes. Please help me out.
thanx and best wishes

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How to convert an Image to a byte array?

I want to make a screenshot and then convert the image to a byte of arrays so I can send it through a BufferedOutputStream.
try
               robot = new Robot();
               screenshot = robot.createScreenCapture(new Rectangle(500,500));
               imageFile = new File("image.png");
               ImageInputStream iis = ImageIO.createImageInputStream(screenshot);
               byte[] data = new byte[1024];
               byte[] tmp = new byte[0];
               byte[] myArrayImage = new byte[0];
               int len = 0;
               int total = 0;
               while((len = iis.read(data)) != -1 ) // LINE 52 --- EXCEPTION CATCHED HERE
                    total += len;
                    tmp = myArrayImage;
                    myArrayImage = new byte[total];
                    System.arraycopy(tmp,0,myArrayImage,0,tmp.length);
                    System.arraycopy(data,0,myArrayImage,tmp.length,len);
               ios.close();I get this exception while running:
Exception in thread "Thread-0" java.lang.NullPointerException
at Server.run(Server.java:52)
at java.lang.Thread.run(Unknown Source)

Fixed that. I got a new problem.
When I connect to my simple server application that reads the image file, converts it to an array of bytes and sends it back, the file is created on the client side and it containts data, but I am not able to open the image. I have checked that the image that the server is sending is working. So where is the problem?
The client application recieves the image as following:
public void run()
        try
            socket = new Socket("127.0.0.1", 2000);
            BufferedOutputStream out_file = new BufferedOutputStream(new FileOutputStream("recieved_img.png"));
            BufferedReader in = new BufferedReader(new InputStreamReader(socket.getInputStream()));
            int inputLine;
            while((inputLine = in.read()) != -1)
                char c = (char)inputLine;
                System.out.println(c);
                out_file.write(inputLine);
        catch(IOException err){ err.printStackTrace(); }
    }And the server sends the image like this;
try
          socket = server.accept();
          in=new BufferedReader(new InputStreamReader(socket.getInputStream()));
          out = new BufferedOutputStream(socket.getOutputStream());
          out.write(25);
          while((inputLine = in.readLine()) != null)
               System.out.println(myArrayImage.length);
          System.out.println(inputLine);
                    out.write(myArrayImage);     // Send the array of bytes
     }

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I'm looking for a way to convert an Imaq image into a regular picture (2D array) without using "Vision development module", nor saving it to a file (I need a refresh rate of about One frame per second).
any ideas?
thanks,
Gilad.

Greetings,
If instead of attempting to acquire the image as the raw data as per the last example, are you looking for something then like the IMAQ Image to Array? I made some research and initially I believed this VI was part of the Development Module, but I was thinking of the Array to Image VI, which is why I did not bring it up earlier.
Finally, how exactly will you then be manipulating that array? Or will you simply be interested in displaying it?
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hi Constantinos Loizou
i m having same problem which u were facing in last month.
my problem i have to save .WAV file into RMS and then retreive it from RMS.
my Code is
Read From RMS
RecordStore rsUser = RecordStore.openRecordStore(file,true);
if(rsUser.getNumRecords() > 0)
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catch(Exception ex) {
ex.printStackTrace();
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try {
RecordStore rsUser = RecordStore.openRecordStore(file,true);
int idata = is.available();
byte[] exdata = new byte[idata];
is.read(exdata);
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catch(Exception ex) {
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now i have the file successfully when i retrieve it from RMS and p.reliaze() give me exception
javax.microedition.media.MediaException: Failed to realize Player: Malformed wave media: expected 'RIFF'
have u able to solve it. if yes then pls give me solution. or give other solution if this soution is not good
regardz
Hassan Mushtaq

Well, I'm not going to give you your code on a silver platter. You'll need to put some effort in it yourself.
So look at that available() method yourself an see if you can improve on that. Look at the api docs, there is loads of information there, and often it will give you pointers on why things are not working.

How do i convert an image object to a byte array ?

Hi
how do i convert an image object into a byte array
early reply apperciated

Oh sorry my method and the other method need to have the pixels from the Image passed to them which you get my using pixelgrabber:
//create width and height variables from image
          int w = img.getWidth(this);
          int h = img.getHeight(this);
          //retrive picture from image
          int[] pix = new int[w * h];
          PixelGrabber pg = new PixelGrabber(img, 0, 0, w, h, pix, 0, w);
          try{ pg.grabPixels();
          } catch (InterruptedException ioe) {
               System.err.println("Interrupted");
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How can i convert object to byte array very*100 fast?

i need to transfer a object by datagram packet in embeded system.
i make a code fallowing sequence.
1) convert object to byte array ( i append object attribute to byte[] sequencailly )
2) send the byte array by datagram packet ( by JNI )
but, it's not satisfied my requirement.
it must be finished in 1ms.
but, converting is spending 2ms.
network speed is not bottleneck. ( transfer time is 0.3ms and packet size is 4096 bytes )
Using ObjectOutputStream is very slow, so i'm using this way.
is there antoher way? or how can i improve?
Edited by: JongpilKim on May 17, 2009 10:48 PM
Edited by: JongpilKim on May 17, 2009 10:51 PM
Edited by: JongpilKim on May 17, 2009 10:53 PM

thanks a lot for your reply.
now, i use udp socket for communication, but, i must use hardware pci communication later.
so, i wrap the communication logic to use jni.
for convert a object to byte array,
i used ObjectInputStream before, but it was so slow.
so, i change the implementation to use byte array directly, like ByteBuffer.
ex)
public class ByteArrayHelper {
private byte[] buf = new byte[1024];
int idx = 0;
public void putInt(int val){
buf[idx++] = (byte)(val & 0xff);
buf[idx++] = (byte)((val>>8) & 0xff);
buf[idx++] = (byte)((val>>16) & 0xff);
buf[idx++] = (byte)((val>>24) & 0xff);
public void putDouble(double val){ .... }
public void putFloat(float val){ ... }
public byte[] toByteArray(){ return this.buf; }
public class PacketData {
priavte int a;
private int b;
public byte[] getByteArray(){
ByteArrayHelper helper = new ByteArrayHelper();
helper.putInt(a);
helper.putInt(b);
return helper.toByteArray();
but, it's not enough.
is there another way to send a object data?
in java language, i can't access memory directly.
in c language, if i use struct, i can send struct data to copy memory by socket and it's very fast.
Edited by: JongpilKim on May 18, 2009 5:26 PM

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How can I insert an object in an array of variable size?
I input two numbers from keyboard
1
2that form the following object (Pair)
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how can I add such objects to an array
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e.g.
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top = -1;
s = new Pair[x];
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3.Your exception handlers need some work. Basically, your exception handlers put out a message or do nothing and then you continue processing. Not good.
4. No cleanup of file resources after you have completed
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How to convert a Image object to byte Array?

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