How to transfer large datagram packet via MulticastSocket

Question

Hi all, i'm trying to do a program with capable to capture screen and send out through MulticastSocket. I'm able to do everything and send out which the packet must be below 65535 Byte. Any packet more than 65535 Byte would not able to send out.
An original captured image file size is approximately about 300K Byte.
I also tried to reduce the image quality, but it doesn't look nice, because the image can't even present properly after the quality adjustment.
I'm wondering is there any other method to send out the packet without any compression or any good compression but good image quality remain??
But i'm looking for more better packet transmission for packet size more than 65535 Byte...
These are the code:
InetAddress multicastAddress = InetAddress.getByName("224.5.6.7");
socket = new MulticastSocket(6789);
Robot robot = new Robot();
//Capture Image
BufferedImage bufferedImage = robot.createScreenCapture(new Rectangle(Toolkit.getDefaultToolkit().getScreenSize()));
Iterator<ImageWriter> writers = ImageIO.getImageWritersBySuffix("jpeg");
if (!writers.hasNext()) throw new IllegalStateException("No writers found");
ImageWriter writer = (ImageWriter) writers.next();
//Set Image Quality
ImageWriteParam param = writer.getDefaultWriteParam();
param.setCompressionMode(ImageWriteParam.MODE_EXPLICIT);
//param.setCompressionQuality(1);
param.setCompressionQuality(0.2f); //So far 0.2f is the highest compression and highest quality to transfer, approximately 30K~50K size of packet
//Write/Change Image Quality
ByteArrayOutputStream bos = new ByteArrayOutputStream();
ImageOutputStream ios = ImageIO.createImageOutputStream(bos);
writer.setOutput(ios);
writer.write(null, new IIOImage(bufferedImage, null, null), param);
ios.flush();
//Send packet
DatagramPacket sendPacket = new DatagramPacket(bos.toByteArray(), bos.toByteArray().length ,multicastAddress,6789);
socket.send(sendPacket); //Packet size cannot larger than 65535 ByteThanks in advance :)
Edited by: nick_khor on Jun 25, 2010 6:01 AM

Answer 1

Why, this is my final year project. Why should I lie?Err, you've just given a reason.
I admit this is and extra work, like you said, pointless. Because i really don't know other way to achieve this.That's strange. I've just given you another way to achieve this.
AND For sure the UTF-16 standard will corrupt the image after the conversion.So it's working?
But i don't think there is only "UTF-16". Because I use "ISO-8859-1"So that means it will work? Why?
This is where i got it.
http://stackoverflow.com/questions/520907/split-java-string-in-chunks-of-1024-bytes
(a) No, that's only where you got how to split a String, and you don't need stackoverflow.com for that, just String.substring(). But you don't need Strings at all, see above. I also note that the answer there with the highest number of votes says 'Strings and bytes are two completely different things, so wanting to split a String into bytes is as meaningless as wanting to split a painting into verses.' So it's not much of a source really.
(b) Have you cited that source in your project documentation?
If possible, could guide me on how to
"traverse the original byte array, changing the offset, creating DatagramPackets, and sending them, and accumulating at the receiver."It seems perfectly clear to me. Clear enough for a final year student to turn into code.
I really don't know how it work.
I really don't know how turning things into and out of Strings pointlessly can work either. if I was marking this assignment you would fail.