Examples of java.io.DataInputStream

java.io.DataInputStream
A data input stream lets an application read primitive Java data types from an underlying input stream in a machine-independent way. An application uses a data output stream to write data that can later be read by a data input stream.
DataInputStream is not necessarily safe for multithreaded access. Thread safety is optional and is the responsibility of users of methods in this class. @author Arthur van Hoff @version 1.77, 06/07/06 @see java.io.DataOutputStream @since JDK1.0

     * Read in the video header from the stream.  This will tell
     * us how big to make the video component.
     */
    public boolean doPlayerRealize() {
        mic = new JMFMultiImageRenderer(this);
        DataInputStream in = null;


        try {
            //  Create an input stream
            in = new DataInputStream(
                new PullSourceInputStream(stream) );


            //  Read in the size of the video
            int w = in.readInt();
            int h = in.readInt();


            //  Read in the duration of the video (in nanos)
            duration = in.readLong();


            //  Set the preferred size
            mic.setImageSize( new Dimension(w,h) );
        }
        
        catch(EOFException e) {
            System.err.println("Unexpected EOF encountered in stream");


            postEvent(
                new ResourceUnavailableEvent(this,
                    "Unexpected EOF encountered while reading data stream") );


            return false;
        }


        catch(IOException e) {
            System.err.println("I/O Error reading data");


            postEvent(
                new ResourceUnavailableEvent(this,
                    "I/O error occurred while reading data stream") );


            return false;
        }
        
        finally {
            try { in.close(); } catch(Exception e) {}
        }


        //  Set the visualComponent
        setVisualComponent(mic);

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    public boolean doPlayerPrefetch() {
        //  Has the data already been prefetched?
        if( ! prefetchNeeded ) return true;


        Vector frameVector = new Vector();
        DataInputStream in = null;


        try {
            //  Create an input stream
            in = new DataInputStream(
                new PullSourceInputStream(stream) );


            //  Load every image, first processing the image
            //  length and frame delay in the header
            try {
                while(true) {
                    //  Get frame length
                    long length = in.readLong();


                    //  Get frame delay
                    long nanos = in.readLong();


                    //  Get frame image
                    byte[] b = new byte[(int)length];
                    in.readFully(b,0,(int)length);
                    ImageIcon icon = new ImageIcon(b);


                    //  Update CachingControl
                    cache.addToProgress(16 + length);


                    //  Create MultiImageFrame object
                    MultiImageFrame m = new MultiImageFrame(icon, nanos);
                    frameVector.addElement(m);
                }
            }
            
            //  Read until EOF
            catch(EOFException e) {
                cache.setDone();
            }
        }
        
        catch(IOException e) {
            System.err.println("I/O Error reading data");


            postEvent(
                new ResourceUnavailableEvent(this,
                    "I/O error occurred while reading data stream") );


            return false;
        }
        
        finally {
            try { in.close(); } catch(Exception e) {}
        }


        //  Convert the vector to an array and set the frames
        MultiImageFrame[] frames = new MultiImageFrame[frameVector.size()];
        frameVector.copyInto(frames);

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        try {
            String path= pathPrefix + "rx.dat";


      FileInputStream fin= new FileInputStream( path);
      BufferedInputStream bin= new BufferedInputStream( fin);
      DataInputStream din= new DataInputStream( bin);


      int n_targets= din.readInt();


      for( int i= 0; i < n_targets; i++) {
    String localPort= readString( din);
    String ip= readString( din);
    String port= readString( din);

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        try {
            String path= pathPrefix + "xmit.dat";


      FileInputStream fin= new FileInputStream( path);
      BufferedInputStream bin= new BufferedInputStream( fin);
      DataInputStream din= new DataInputStream( bin);


            local_data_port= readString( din);


      int n_targets= din.readInt();


      for( int i= 0; i < n_targets; i++) {
    String ip= readString( din);
    String port= readString( din);

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            System.exit(0); 
        }


        Vector frameVector = new Vector();


        DataInputStream in = null;


        try {
            in = new DataInputStream(
                new FileInputStream(
                    new File(args[0]) ) );


            try {
                //  Read in the width/height/duration
                in.readInt();
                in.readInt();
                in.readLong();


                //  Read in the frames
                while(true) {
                    //  Read in the length of the frame
                    long length = in.readLong();


                    //  Read in the delay for the frame
                    long nanos = in.readLong();


                    //  Read in the frame image
                    byte[] b = new byte[(int)length];
                    in.readFully(b,0,(int)length);
                    ImageIcon icon = new ImageIcon(b);


                    //  Create a MultiImageFrame object and add to vector
                    MultiImageFrame m = new MultiImageFrame(icon, nanos);
                    frameVector.addElement(m);
                }
            } catch(EOFException e) {}
        }
        
        catch(IOException e) {
            System.err.println("Could not read in data");
            e.printStackTrace();
            System.exit(1);
        }
        
        finally {
            try { in.close(); } catch(IOException e) {}
        }


        //  Copy frames into array
        MultiImageFrame[] frames = new MultiImageFrame[frameVector.size()];
        frameVector.copyInto(frames);

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                socket.getOutputStream(), true);


        is = socket.getInputStream();


        input =
            new DataInputStream(is);


        verifySuccessful();
        command(GROUP_CMD + " " + newsgroup);
    }

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   private ClusterRequest readRequest(byte[] bytes) throws Exception
   {
      ByteArrayInputStream bais = new ByteArrayInputStream(bytes);


      DataInputStream dais = new DataInputStream(bais);


      ClusterRequest request = ClusterRequest.createFromStream(dais);


      dais.close();


      return request;
   }

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         byte[] bytes = bos.toByteArray();
         
         ByteArrayInputStream bis = new ByteArrayInputStream(bytes);
                  
         DataInputStream dis = new DataInputStream(bis); 
                 
         int theId = dis.readInt();
         
         assertEquals(id, theId);
      }

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         byte[] bytes = bos.toByteArray();
         
         ByteArrayInputStream bis = new ByteArrayInputStream(bytes);
                  
         DataInputStream dis = new DataInputStream(bis); 
                 
         int theId = dis.readInt();
         
         assertEquals(PacketSupport.SERIALIZED, theId);
      }

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    // Due to applet security, can only be invoked by run() thread
    private String readRawFile() {
        String rawData = "";
        try {
            byte[] buffer = new byte[512];
            DataInputStream in = new DataInputStream(new URL(file).openStream());
            //String inputLine;
            while (true) {
                int len = in.read(buffer);
                if (len == -1) {
                    break;
                }
                rawData += new String(buffer, 0, len, charset.name());
            }
            in.close();
        } catch (Exception e) {
            LogIt.log(Level.WARNING, "Error reading/parsing specified RAW file", e);
        }
        return rawData;
    }

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