saad sal

What i would like to know is whether we can resize a picture on a canvas screen. I have an Image object. I display it on the canvas. Now when the user presses a button, i want the image to zoom in. Is there any way to zoom in the image.

well, at first i thought that it was a synchronizing problem, and it was to some extent. However later I found out that my first guess was right. It was the drawImage call that was throwing the exception. Well after finishing synchronizing, all i had to do was to replace the getwidth() and getheight() parameters with image.getwitdh() & image.getheight() etc and the program worked just fine.

thanks I solved the problem. There was nothing wrong with the drawImage method after all.

i am using a .png image, but i dont think that even using a jpeg image would make a difference
[ May 25, 2006: Message edited by: saad sal ]

public class MyCanvas extends Canvas { Image img = null; ... ... public void paint(Graphics g) { g.drawImage(img, getWidth() / 2, getHeight() / 2, Graphics.VCENTER | Graphics.HCENTER); } }

I am unable to display an image on a Nokia 6630 or a 6680 using the code above. However the image is displayed on a Nokia 6600. Has anyone else encountered the same problem? Is there another way to display an image in the Canvas class?
[ May 23, 2006: Message edited by: saad sal ]

Ok thanks. I guess theres no other way then.....have used the Canvas class to move the mouse on PC screen through a Nokia 6630 .

But now I have another problem. I have to get the initial starting position of the mouse from the PC. I am trying to use
public void mouseMoved(MouseEvent e) { x = e.getX(); y = e.getY(); }

But this limits the mouse within a frame whereas I want this to work on anywhere on the PC screen and set the initial value of x and y.

Could anyone help me with this.

You could edit it externally by opening the .java file in notepad or any other external editor. But be careful, this may give rise to a lot of errors, so backup your code before doing so.

I want to find out which events are thrown when the keypad keys are pressed on a mobile phone. I want to use the up,down,left,right keys for movement. However I am not using a Canvas class and am not showing these events on the mobile phone. Basically I am using these movement keys to a server(Computer) and am using them to control the mouse on the Computer.

Basically, in short, what i want to know is the events OR ascii code that is thrown when a particular key is pressed on the mobile phone.

c = server.acceptAndOpen(); OutputStream out = c.openOutputStream(); // The connection is established and working Robot robot = new Robot(); BufferedImage image = robot.createScreenCapture(new Rectangle(0,0,50,50)); ImageIO.write(image,"jpeg",out); //Writes to outputStream //This code is supposed to be in the Client app.. but for now I am //testing it in the server to see if it works BufferedImage image2 = ImageIO.read(in); ImageIO.write(image2,"jpeg", new File("latest.jpeg"));

The exception that comes is java.lang.IllegalArgumentException: im == null!
Could anyone help me figure out why the image object is a null
[ March 15, 2006: Message edited by: saad sal ]

I have created a BufferedImage object using

BufferedImage image2 = robot.createScreenCapture(new Rectangle(0,0,1000,1000));

What I want to do is write this image2 object to the OutputStream.
Should I convert the image2 object into a byte[] first or can it be written directly to the OutputStream object.

ps what i am trying to do is send the image2 object from the server through the OutputStream to the client over a bluetooth connection which has already been established.

If you are using an IDE such as netbeans or any other for that matter, your .class files are automatically created.

Hi again,
I was having some trouble with the BlueCove connection. I have setup the BlueCove on the PC and it is working fine and the server "waits for client connections."
Here is the J2ME code I am using for the client side.
////////////////////////// BluetoothMIDlet.java /////////////////// import java.lang.*; import java.io.*; import javax.microedition.io.*; import javax.bluetooth.*; import javax.microedition.midlet.*; import javax.microedition.lcdui.*; public class BluetoothMIDlet extends MIDlet implements Runnable, CommandListener { public BluetoothMIDlet(){} //Starts background thread when MIDlet is started public void startApp() throws MIDletStateChangeException { new Thread(this).start(); } public void pauseApp() { } public void destroyApp(boolean unconditional) { } public void run() {} // Destroys the MIDlet when the command occurs public void commandAction(Command c, Displayable d) { notifyDestroyed(); } } /////////////////////// * Client.java///////////////////////////// import java.lang.*; import java.io.*; import javax.bluetooth.*; import javax.microedition.io.*; import javax.microedition.lcdui.*; public class Client extends BluetoothMIDlet { public void run(){ Form f = new Form("Client"); f.addCommand(new Command("Exit", Command.EXIT, 1)); f.setCommandListener(this); Display.getDisplay(this).setCurrent(f); try{ LocalDevice local = LocalDevice.getLocalDevice(); DiscoveryAgent agent = local.getDiscoveryAgent(); String connString = agent.selectService(new UUID("102030405060708090A0B0C0D0E0F010", false),ServiceRecord.NOAUTHENTICATE_NOENCRYPT, false); if(connString != null){ try{ //Connect to server and send Hello msg StreamConnection conn = (StreamConnection)Connector.open(connString); OutputStream out = conn.openOutputStream(); out.write("Hello, World".getBytes()); out.close(); conn.close(); f.append("Message sent properly"); } catch (IOException e){ f.append("IOException: "); f.append(e.getMessage()); } } else { f.append("Unable to locate service"); } } catch (BluetoothStateException e){ f.append("BluetoothStateException: "); f.append(e.getMessage()); } } }

There is no build or run error in the code, but when I run the application it is unable to find any server.
I am running this on a Nokia 6630 whereas the server runs on the PC.

I would appreciate any help i can get.
[ February 05, 2006: Message edited by: Jim Yingst ]

I am working on a similar project in which I have to send images from a PC to the phone. I've came across a similar problem. Check this article out. It may help.

http://java.sun.com/developer/technicalArticles/Programming/compression/

By the way. Are you using J2SE on the PC side? If so what type of connection are you using? RFCOMM?

thankyou both. That cleared out my problem

Well i have both the ".java files" and the "jar file" for the service discovery and stuff. Should i only add the jar file to the class path.


Another question i have is that when i use
"import javax.microedition.io.*;"
Is this like using #include<iostream.h> in C++ OR do i have to add some sort of java header files at javax.microedition.io classpath ?
[ January 27, 2006: Message edited by: saad sal ]