image capturing

[bejoy_ak]

Hi
i am using nokia 6303classic S40 6th edition which support JSR234 API,and i am using the following code to capture image, but its not working can anyone explain why..?

import java.io.*;
import javax.microedition.lcdui.*;
import javax.microedition.media.*;
import javax.microedition.midlet.*;
import javax.microedition.media.control.*;

public class CameraMIDlet extends MIDlet implements CommandListener {

private Display display;
private Form form,mform;
private Command exit,back,capture,camera,toCamera;
private Player player;
private VideoControl videoControl;
private Video video;
public CameraMIDlet() {

exit = new Command("Exit", Command.EXIT, 0);
camera = new Command("Camera", Command.SCREEN, 0);
back = new Command("Back", Command.BACK, 0);
capture = new Command("Capture", Command.SCREEN, 0);
toCamera= new Command("Back",Command.BACK,1);
mform= new Form("Image");
form = new Form("Capture Video");
form.addCommand(camera);
form.addCommand(exit);
form.setCommandListener(this);
}

public void startApp() {
display = Display.getDisplay(this);
display.setCurrent(form);
}

public void pauseApp() {
}

public void destroyApp(boolean unconditional) {
}

public void commandAction(Command c, Displayable s) {
if (c == exit) {
destroyApp(true);
notifyDestroyed();
}else if (c == camera) {
showCamera();
}else if (c == back){
display.setCurrent(form);
}else if (c == capture) {
video = new Video(this);
video.start();
}else if(c==toCamera){
showCamera();
}
}

public void showCamera() {
try{
player = Manager.createPlayer("capture://video");
player.realize();
videoControl = (VideoControl)player.getControl("VideoControl");
Canvas canvas = new VideoCanvas(this, videoControl);
canvas.addCommand(back);
canvas.addCommand(capture);
canvas.setCommandListener(this);
display.setCurrent(canvas);
videoControl.setVisible(true);
player.start();
}catch (IOException ioe) {
ioe.printStackTrace();
}catch (MediaException me) {
me.printStackTrace();
}
}

class Video extends Thread {
CameraMIDlet midlet;
public Video(CameraMIDlet midlet) {
this.midlet = midlet;
}

public void run() {
captureVideo();

}

public void captureVideo() {
try {
byte[] raw = videoControl.getSnapshot("encoding=png");
Image image = Image.createImage(raw, 0, raw.length);
videoControl.setVisible(false);
player.stop();
player.close();
player = null;
videoControl = null;
mform.append(image);
mform.addCommand(toCamera);
display.setCurrent(mform);
mform.setCommandListener(midlet);
} catch (MediaException me) {
me.printStackTrace();
}catch (Exception e) {
e.printStackTrace();
}
}
};
}
//============================

import javax.microedition.lcdui.*;
import javax.microedition.media.*;
import javax.microedition.media.control.*;

public class VideoCanvas extends Canvas {
CameraMIDlet midlet;

public VideoCanvas(CameraMIDlet midlet, VideoControl videoControl) {
int width = getWidth();
int height = getHeight();
this.midlet = midlet;

videoControl.initDisplayMode(VideoControl.USE_DIRECT_VIDEO, this);
try {
videoControl.setDisplayLocation(2, 2);
videoControl.setDisplaySize(width - 4, height - 4);
} catch (MediaException me) {
me.printStackTrace();
}

}

public void paint(Graphics g) {
int width = getWidth();
int height = getHeight();

g.setColor(0x00ff00);
g.drawRect(0, 0, width - 1, height - 1);
g.drawRect(1, 1, width - 3, height - 3);
}
}

[grahamhughes]

its not working

Can you be any more specific?

byte[] raw = videoControl.getSnapshot("encoding=png");

My first suspicion would be that this might not be supported.

Graham.

[bejoy_ak]

i replaced that by this then also no result..its showing the camera but nothing happens when i press the capture button...


byte[] raw = videoControl.getSnapshot(null);

[grahamhughes]

There is some sample code in the wiki for image capture.

Graham.

[bejoy_ak]

the same code worked in N95....i don't know what is the problem with 6303...

[grahamhughes]

It is not necessarily a problem with the 6303. Different phones behave differently. This is normal. Especially phones of different operating systems. You will find it often the case that problems in your code will show up on some devices, and not on others.

Is any exception being thrown?

Try the sample code. Does that work? If so, see how the sample code is different to yours.

Graham.

[bejoy_ak]

i tried the sample code you provided..its showing the error

"Only capture://image locator supports getSnapshot()"

[grahamhughes]

Does this work?

import java.io.IOException;

import javax.microedition.midlet.MIDlet;

import javax.microedition.lcdui.Canvas;
import javax.microedition.lcdui.CommandListener;
import javax.microedition.lcdui.Command;
import javax.microedition.lcdui.Display;
import javax.microedition.lcdui.Displayable;
import javax.microedition.lcdui.Form;
import javax.microedition.lcdui.Graphics;
import javax.microedition.lcdui.Image;

import javax.microedition.media.Manager;
import javax.microedition.media.Player;
import javax.microedition.media.MediaException;
import javax.microedition.media.control.VideoControl;

public class Snapper extends MIDlet implements CommandListener {
    private static final Command EXIT = new Command("Exit", Command.EXIT, 0);
    private static final Command SNAP = new Command("Snap", Command.OK, 0);

    private Displayable shown;

    public void startApp() {
        if (shown == null) {
            shown = new ViewFinder();
            shown.addCommand(SNAP);

            try {
                ((ViewFinder) shown).initialize();
            } catch (Exception e) {
                Form f = new Form("Error");
                f.append(e.toString());
                shown = f;
            }
            shown.addCommand(EXIT);
            shown.setCommandListener(this);
        }
        setCurrent(shown);
    }

    public void pauseApp() {
        // do nothing
    }

    public void destroyApp(boolean must) {
        // do nothing
    }

    private void setCurrent(Displayable d) {
        shown = d;
        Display.getDisplay(this).setCurrent(d);
    }

    public void commandAction(Command c, Displayable d) {
        if (c == EXIT) {
            notifyDestroyed();
        } else if (c == SNAP) {
            Form f;
            try {
                byte[] image = ((ViewFinder) d).snap();
                f = new Form("Success");
                f.append(Image.createImage(image, 0, image.length));
            } catch (Exception e) {
                f = new Form("Error");
                f.append(e.toString());
            }
            f.addCommand(EXIT);
            f.setCommandListener(this);
            setCurrent(f);
        }
    }

    private static class ViewFinder extends Canvas {
        private Player player;
        private VideoControl video;

        public void initialize() throws MediaException, IOException {
            player = Manager.createPlayer("capture://image");
            player.start();
            video = (VideoControl) player.getControl("VideoControl");
            video.initDisplayMode(VideoControl.USE_DIRECT_VIDEO, this);
            video.setDisplayLocation(2, 2);
            video.setDisplaySize(getWidth() - 4, getHeight() - 4);
            video.setVisible(true);
        }

        public byte[] snap() throws MediaException {
            byte[] data = video.getSnapshot(null);
            player.stop();
            return data;
        }

        protected void paint(Graphics g) {
            g.setColor(0xffffff);
            g.fillRect(0, 0, getWidth(), getHeight());
        }
    }
} 

[bejoy_ak]

thanks graham sir

it worked....