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Thread: Y is this showing a error???

  1. #1
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    Default Y is this showing a error???

    Y DOES THIS CODE SHOW ERROR ?????????

    import java.awt.Component;
    import java.awt.Dimension;
    import java.awt.Graphics;
    import java.awt.image.BufferedImage;
    import java.awt.image.ImageObserver;
    import java.io.BufferedInputStream;
    import java.io.DataInputStream;
    import java.io.IOException;
    import java.io.InputStream;
    import java.net.HttpURLConnection;
    import java.net.URL;

    import javax.swing.JFrame;


    public class Axis implements Runnable {
    private static final long serialVersionUID = 1L;
    public boolean useMJPGStream = true;
    public String jpgURL = "http://ip here/video.cgi/jpg/image.cgi?resolution=640480";
    public String mjpgURL = "http://ip here /video.cgi/mjpg/video.cgi?resolution=640480";
    DataInputStream dis;
    private BufferedImage image = null;
    public Dimension imageSize = null;
    public boolean connected = false;
    private boolean initCompleted = false;
    HttpURLConnection huc = null;
    Component parent;

    /** Creates a new instance of AxisCamera */
    public Axis(Component parent_) {
    parent = parent_;
    }

    public void connect() {
    try {
    URL u = new URL(useMJPGStream ? mjpgURL : jpgURL);
    huc = (HttpURLConnection) u.openConnection();

    // System.out.println(huc.getContentType());
    InputStream is = huc.getInputStream();

    connected = true;
    BufferedInputStream bis = new BufferedInputStream(is);
    dis = new DataInputStream(bis);
    if (!initCompleted)
    initDisplay();
    } catch (IOException e) { // incase no connection exists wait and try
    // again, instead of printing the error
    try {
    huc.disconnect();
    Thread.sleep(60);
    } catch (InterruptedException ie) {
    huc.disconnect();
    connect();
    }
    connect();
    } catch (Exception e)
    {
    ;
    }
    }

    public void initDisplay() { // setup the display
    if (useMJPGStream)
    readMJPGStream();
    else {
    readJPG();
    disconnect();
    }
    imageSize = new Dimension(image.getWidth(), image.getHeight());
    parent.setPreferredSize(imageSize);
    parent.setSize(imageSize);
    parent.validate();
    initCompleted = true;
    }

    public void disconnect() {
    try {
    if (connected) {
    dis.close();
    connected = false;
    }
    } catch (Exception e) {
    ;
    }
    }

    public void paint(Graphics g) { // used to set the image on the panel
    if (image != null)
    g.drawImage(image, 0, 0, (ImageObserver) this);
    }

    public void readStream() { // the basic method to continuously read the
    // stream
    try {
    if (useMJPGStream) {
    while (true) {

    readMJPGStream();
    parent.repaint();
    }
    } else {
    while (true) {
    connect();
    readJPG();
    parent.repaint();
    disconnect();

    }
    }

    } catch (Exception e) {
    ;
    }
    }

    public void readMJPGStream() { // preprocess the mjpg stream to remove the
    // mjpg encapsulation
    readLine(3, dis); // discard the first 3 lines
    readJPG();
    readLine(2, dis); // discard the last two lines
    }

    public void readJPG() { // read the embedded jpeg image
    try {


    // JPEGImageDecoder decoder = JPEGCodec.createJPEGDecoder(dis);
    //image = decoder.decodeAsBufferedImage();

    } catch (Exception e) {
    e.printStackTrace();
    disconnect();
    }

    }

    public void readLine(int n, DataInputStream dis) { // used to strip out the
    // header lines
    for (int i = 0; i < n; i++) {
    readLine(dis);
    }
    }

    public void readLine(DataInputStream dis) {
    try {
    boolean end = false;
    String lineEnd = "\n"; // assumes that the end of the line is marked
    // with this
    byte[] lineEndBytes = lineEnd.getBytes();
    byte[] byteBuf = new byte[lineEndBytes.length];

    while (!end) {
    dis.read(byteBuf, 0, lineEndBytes.length);
    String t = new String(byteBuf);
    System.out.print(t); // uncomment if you want to see what the
    // lines actually look like
    if (t.equals(lineEnd))
    end = true;
    }
    } catch (Exception e) {
    e.printStackTrace();
    }

    }

    public void run() {
    System.out.println("in Run...................");
    connect();
    readStream();
    }

    @SuppressWarnings("deprecation")
    public static void main(String[] args) {


    JFrame jframe = new JFrame();
    jframe.setDefaultCloseOperation(JFrame.EXIT_ON_CLO SE);
    Axis axPanel = new Axis(jframe);

    new Thread(axPanel).start();
    jframe.add(axPanel); //code shows error here
    jframe.pack();
    jframe.show();
    }
    }


  2. #2
    Senior Member PhHein's Avatar
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    Default Re: Y is this showing a error???

    I don't see an error! Post the exact stack trace and use code tags.

  3. #3
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    Default Re: Y is this showing a error???

    1.jpg

    hers the snapshot with error

  4. #4
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    Default Re: Y is this showing a error???

    maybe the method doesnt have a parameter.

  5. #5
    Super Moderator copeg's Avatar
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    Default Re: Y is this showing a error???

    See the API for the method you are using. What does it say? What does it accept as a parameter (s)? Are you passing an instance(s) of that type?

    FYI, please wrap your code in the code tags, please copy and paste errors rather than screen shots, and please use proper grammar

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