Error creating image

Question

Im getting error when trying to create an image from array
when i am reading the image as array from the network
public void write(OutputStream out) throws IOException{
    DataOutputStream dout = new DataOutputStream(out);
    //Write mood name
    dout.writeUTF(m_moodName);
    if(m_img == null){
      //Write there is no image
      dout.writeBoolean(false);
    }else{
      //Write there is image
      dout.writeBoolean(true);
      PngEncoder pngEncoder = new PngEncoder(m_img);
      byte[] array = pngEncoder.pngEncode();
      //Write the array length
      dout.writeInt(array.length);
      //Write the array
      dout.write(array);
      dout.flush();
  public void read(InputStream in) throws IOException{
    DataInputStream din = new DataInputStream(in);
    //Read mood name
    m_moodName = din.readUTF();
    //Read if there is image
    boolean bool = din.readBoolean();
    if(bool == true){
      //Read byte array length
      int length = din.readInt();
      byte[] array = new byte[length];
      //Read to byte array
      din.readFully(array);
      m_img = Toolkit.getDefaultToolkit().createImage(array);
  }This is the exception that i am getting
Uncaught error fetching image:
java.lang.NegativeArraySizeException
     at sun.awt.image.PNGImageDecoder.produceImage(Unknown Source)
     at sun.awt.image.InputStreamImageSource.doFetch(Unknown Source)
     at sun.awt.image.ImageFetcher.fetchloop(Unknown Source)
     at sun.awt.image.ImageFetcher.run(Unknown Source)I am getting this error from this line... (i think)
m_img = Toolkit.getDefaultToolkit().createImage(array);and here is PNG encoder that i am using
http://catcode.com/pngencoder/
please help...
shay

Answer 1

There are many possible reasons, for example:
- pngEncoder produces wrong result.
- byte array is corrupted on transition.
I'd suggest to save this byte array as file and check if this image can be open by any image viewer.
Also, it seems Image I/O is applicable in your scenario.
Consider using it because it is recomeded API to work with images nowadays
(unless you have something ImageIO can not handle, e.g. animated images)