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Title Screen Capture and multicast
Author Sunil Kumar Gupta
Author Email sunil_gupta20801 [at] redifmail.com
Description This project captures the screen and compress the captured image and then multicast it, so that all the machines connected with that multicast address can receive the captured screen.

Category Java » Java Swing
Hits 30725
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Code : /////////////////////ImageCanvas.java///////////////////// import com.sun.image.codec.jpeg.*; import java.awt.image.BufferedImage; import java.awt.Graphics2D; import java.awt.RenderingHints; import java.awt.image.*; import java.awt.*; import java.net.*; import java.io.*; import javax.imageio.ImageIO; import java.awt.geom.*; public class ImageCanvas implements Runnable { public Robot robo; byte [] dataone; int count=0; public BufferedImage myImage; public InetAddress multicastAddress; public MulticastSocket socket; public static void main(String args[]) { try { ImageCanvas img=new ImageCanvas(); new Thread(img).start(); } catch(Exception e) { System.out.println("Errr in Imgcanvas "+e); } } public void start() { } public ImageCanvas() { try { robo=new Robot(); } catch(Exception e) { System.out.println("Errr in Imgcanvas cons "+e); } } public void run() { for (;;) { try { myImage=robo.createScreenCapture(new Rectangle(0,0,800,800)); //myImage=robo.createScreenCapture(new Rectangle(Toolkit.getDefaultToolkit().getScreenSize())); int x1=155;int y1=150;int x2=205;int y2=185; int red = 255; int green = 0; int blue = 0; int transparency = 100; // do the highlighting Graphics graphics = myImage.getGraphics(); Color color = new Color(red, green, blue,255 * transparency/100); graphics.setColor(color); graphics.drawString("Screen Capture " + new java.util.Date(),50, myImage.getHeight() - 10); int thumbWidth=500,thumbHeight=500; double thumbRatio = (double)thumbWidth / (double)thumbHeight; int imageWidth = myImage.getWidth(null); int imageHeight = myImage.getHeight(null); double imageRatio = (double)imageWidth / (double)imageHeight; if (thumbRatio < imageRatio) { thumbHeight = (int)(thumbWidth / imageRatio); } else { thumbWidth = (int)(thumbHeight * imageRatio); } // draw original image to thumbnail image object and // scale it to the new size on-the-fly BufferedImage thumbImage = new BufferedImage(thumbWidth,thumbHeight, BufferedImage.TYPE_INT_RGB); Graphics2D graphics2D = thumbImage.createGraphics(); graphics2D.setRenderingHint(RenderingHints.KEY_INTERPOLATION,RenderingHint s.VALUE_INTERPOLATION_BILINEAR); graphics2D.drawImage(myImage, 0, 0, thumbWidth, thumbHeight, null); BufferedOutputStream out = new BufferedOutputStream(new FileOutputStream("screencapture.jpg")); JPEGImageEncoder encoder = JPEGCodec.createJPEGEncoder(out); JPEGEncodeParam param = encoder.getDefaultJPEGEncodeParam(thumbImage); int quality = Integer.parseInt("75"); quality = Math.max(0, Math.min(quality, 100)); param.setQuality((float)quality / 100.0f, false); encoder.setJPEGEncodeParam(param); encoder.encode(thumbImage); File file=new File("screencapture.jpg"); RandomAccessFile f=new RandomAccessFile(file,"r"); System.out.println(" transmit len= "+f.length()); byte [] data = new byte[(int)f.length()]; if(count++==0) dataone=new byte[data.length]; f.read(data); if(dataone.length!=data.length) { System.out.println("Transmitting"); multicastAddress = InetAddress.getByName("224.5.6.7"); socket = new MulticastSocket(6789); DatagramPacket sendPacket=new DatagramPacket(data,data.length,multicastAddress,6789); socket.send(sendPacket); } dataone=data; f.close(); file.delete(); } catch(Exception e) { System.out.println("Errr in Imgcanvas thread "+e); } } } }// End of ImageCanvas.java ////////////////////////////////////Test.java///////////////// import java.awt.*; import javax.swing.*; import java.awt.image.*; import java.net.*; import com.sun.image.codec.jpeg.*; import java.awt.image.BufferedImage; import java.awt.Graphics2D; import java.awt.RenderingHints; class screenCapture extends Canvas implements Runnable { Image image=null; Robot robo =null; byte buffer[]=new byte[60000]; static MediaTracker tracker; public screenCapture () { } public void run() { for(; ;) { try { InetAddress mdd=InetAddress.getByName("224.5.6.7"); MulticastSocket sck=new MulticastSocket(6789); sck.joinGroup(mdd); DatagramPacket pck=new DatagramPacket(buffer,buffer.length); sck.receive(pck); image = Toolkit.getDefaultToolkit().createImage(pck.getData()); image=image.getScaledInstance(this.getWidth(),this.getHeight(),2); tracker = new MediaTracker(this); tracker.addImage(image,0); } catch(Exception e) System.out.println("Errr in test "+e); } try { tracker.waitForID(0); } catch(Exception e) { System.out.println("Errr in tracker "+e); } repaint(); } // end of for loop } public void paint (Graphics g) { try { g.drawImage(image,0,0,this); } catch(Exception e){System.out.println("Errr in paint "+e);} return; } public void update(Graphics g) { paint(g); } } public class Test { public static void main(String args[]) { JFrame fram = new JFrame(); screenCapture capture = new screenCapture(); fram.getContentPane().add(capture); fram.setSize(510,520); fram.setLocation(600,200); fram.show(); new Thread(capture).start(); } } //end of Test.java

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