Capture desktop image continuously

hi friends,
i am doing a project in which i have to transfer desktop image of server
to all clients.i have used multithreading.like one thread for each client and one
thread for capturing image.
i have two programs RobotServer.java and RobotClient.java . They work well.but i want to check authentication of client and then send images to client. so i ahve just added one program i.e. JFrame to check authentication of client.
after authentication of client i have just created object of RobotClient.java so that it can take images sent by server.but i am not able to see images coming from server. after adding just one frame in between something is going wrong.
can plz anyone help to find where am i going wrong?

U said... u have two programs RobotServer.java and RobotClient.java where are they ?
cant proceed without any code...

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Thanks a lot. But when I view the program in the thread, it seems that it needs to some program code is to play the video first and then the image can be captured. Is it possible that even I don't write the code for playing the video first and just write the captured code so that can still capture the image by using Java only from the exists video file. Thanks a lot.You can get away without playing the video by seeking to the frame you want using FramePositioningControl ( [example here|http://java.sun.com/javase/technologies/desktop/media/jmf/2.1.1/solutions/Seek.html] )and then capturing the frame using FrameGrabbingControl (similar to the code I posted). But still you would have to load the video file, create the player using url, realize the player, perhaps prefetch it (all in the link I have given above) then you are ready to seek to particular frame and capture it. But now you don't need to actually start the player so that video/audio is visible/audible.
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hi
so as i understood u want to access the USB and make whats called camera interaction i worked with my webcam and i generate a video stream and i'm working now to sample this video
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* File: DeviceInfo.java.java
* created 24.07.2001 21:44:12 by David Fischer, [email protected]
import java.awt.Dimension;
import javax.media.*;
import javax.media.control.*;
import javax.media.format.*;
import javax.media.protocol.*;
public class DeviceInfo
     public static Format formatMatches (Format format, Format supported[] )
          if (supported == null)
               return null;
          for (int i = 0; i < supported.length; i++)
               if (supported.matches(format))
                    return supported[i];
          return null;
     public static boolean setFormat(DataSource dataSource, Format format)
          boolean formatApplied = false;
          FormatControl formatControls[] = null;
          formatControls = ((CaptureDevice) dataSource).getFormatControls();
          for (int x = 0; x < formatControls.length; x++)
               if (formatControls[x] == null)
                    continue;
               Format supportedFormats[] = formatControls[x].getSupportedFormats();
               if (supportedFormats == null)
                    continue;
               if (DeviceInfo.formatMatches(format, supportedFormats) != null)
                    formatControls[x].setFormat(format);
                    formatApplied = true;
          return formatApplied;
     public static boolean isVideo(Format format)
          return (format instanceof VideoFormat);
     public static boolean isAudio(Format format)
          return (format instanceof AudioFormat);
     public static String formatToString(Format format)
          if (isVideo(format))
               return videoFormatToString((VideoFormat) format);
          if (isAudio(format))
               return audioFormatToString((AudioFormat) format);
          return ("--- unknown media device format ---");
     public static String videoFormatToString(VideoFormat videoFormat)
          StringBuffer result = new StringBuffer();
          // add width x height (size)
          Dimension d = videoFormat.getSize();
          result.append("size=" + (int) d.getWidth() + "x" + (int) d.getHeight() + ", ");
          // try to add color depth
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               IndexedColorFormat f = (IndexedColorFormat) videoFormat;
               result.append("color depth=" + f.getMapSize() + ", ");
          // add encoding
          result.append("encoding=" + videoFormat.getEncoding() + ", ");
          // add max data length
          result.append("maxdatalength=" + videoFormat.getMaxDataLength() + "");
          return result.toString();
     public static String audioFormatToString(AudioFormat audioFormat)
          StringBuffer result = new StringBuffer();
          // short workaround
          result.append(audioFormat.toString().toLowerCase());
          return result.toString();
the second class:
* File: MyDataSinkListener.java
* created 24.07.2001 21:41:47 by David Fischer, [email protected]
* Decription: simple data sink listener, used to check for end of stream
import javax.media.datasink.*;
public class MyDataSinkListener implements DataSinkListener
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     public void dataSinkUpdate(DataSinkEvent event)
          if (event instanceof javax.media.datasink.EndOfStreamEvent)
               endOfStream = true;
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               Stdout.log("datasink: waiting for end of stream ...");
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          Stdout.log("datasink: ... end of stream reached.");
* File: MyDataSinkListener.java
* created 24.07.2001 21:41:47 by David Fischer, [email protected]
* Decription: simple data sink listener, used to check for end of stream
import javax.media.datasink.*;
public class MyDataSinkListener implements DataSinkListener
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}[i]the 3rd class:/******************************************************
* File: Stdout.java.java
* created 24.07.2001 21:44:46 by David Fischer, [email protected]
* Description: utility class for standard output
public class Stdout
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          System.out.println(msg);
     public static void logAndAbortException(Exception e)
          log("" + e);
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     public static void logAndAbortError(Error e)
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          System.exit(0);
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          System.out.flush();
the 4rt is :
* File: TestQuickCamPro.java
* created 24.07.2001 21:40:13 by David Fischer, [email protected]
* Description: this test program will capture the video and audio stream
* from a Logitech QuickCam� Pro 3000 USB camera for 10 seconds and stores
* it on a file, named "testcam.avi". You can use the microsoft windows
* media player to display this file.
* operating system: Windows 2000
* required hardware: Logitech QuickCam� Pro 3000
* required software: jdk 1.3 or jdk1.4 plus jmf2.1.1 (www.javasoft.com)
* source files: DeviceInfo.java, MyDataSinkListener.java,
*               Stdout.java, TestQuickCamPro.java
* You can just start this program with "java TestQuickCamPro"
* hint: please make shure that you setup first the logitech camerea drives
* and jmf2.1.1 correctly. "jmf.jar" must be part of your CLASSPATH.
* useful links:
* - http://java.sun.com/products/java-media/jmf/2.1.1/index.html
* - http://java.sun.com/products/java-media/jmf/2.1.1/solutions/index.html
* with some small modifications, this program will work with any USB camera.
import java.io.*;
import javax.media.*;
import javax.media.control.*;
import javax.media.datasink.*;
import javax.media.format.*;
import javax.media.protocol.*;
public class TestQuickCamPro
     private static boolean                    debugDeviceList = false;
     private static String                    defaultVideoDeviceName = "vfw:Microsoft WDM Image Capture (Win32):0";
     private static String                    defaultAudioDeviceName = "DirectSoundCapture";
     private static String                    defaultVideoFormatString = "size=176x144, encoding=yuv, maxdatalength=38016";
     private static String                    defaultAudioFormatString = "linear, 16000.0 hz, 8-bit, mono, unsigned";
     private static CaptureDeviceInfo     captureVideoDevice = null;
     private static CaptureDeviceInfo     captureAudioDevice = null;
     private static VideoFormat               captureVideoFormat = null;
     private static AudioFormat               captureAudioFormat = null;
     public static void main(String args[])
          // get command line arguments
          for (int x = 0; x < args.length; x++)
               // -dd = debug devices list -> display list of all media devices - and exit
               if (args[x].toLowerCase().compareTo("-dd") == 0)
                    debugDeviceList = true;
          // get a list of all media devices, search default devices and formats, and print it out if args[x] = "-dd"
          Stdout.log("get list of all media devices ...");
          java.util.Vector deviceListVector = CaptureDeviceManager.getDeviceList(null);
          if (deviceListVector == null)
               Stdout.log("... error: media device list vector is null, program aborted");
               System.exit(0);
          if (deviceListVector.size() == 0)
               Stdout.log("... error: media device list vector size is 0, program aborted");
               System.exit(0);
          for (int x = 0; x < deviceListVector.size(); x++)
               // display device name
               CaptureDeviceInfo deviceInfo = (CaptureDeviceInfo) deviceListVector.elementAt(x);
               String deviceInfoText = deviceInfo.getName();
               if (debugDeviceList)
                    Stdout.log("device " + x + ": " + deviceInfoText);
               // display device formats
               Format deviceFormat[] = deviceInfo.getFormats();
               for (int y = 0; y < deviceFormat.length; y++)
                    // serach for default video device
                    if (captureVideoDevice == null)
                         if (deviceFormat[y] instanceof VideoFormat)
                         if (deviceInfo.getName().indexOf(defaultVideoDeviceName) >= 0)
                         captureVideoDevice = deviceInfo;
                         Stdout.log(">>> capture video device = " + deviceInfo.getName());
                    // search for default video format
                    if (captureVideoDevice == deviceInfo)
                         if (captureVideoFormat == null)
                         if (DeviceInfo.formatToString(deviceFormat[y]).indexOf(defaultVideoFormatString) >= 0)
                         captureVideoFormat = (VideoFormat) deviceFormat[y];
                         Stdout.log(">>> capture video format = " + DeviceInfo.formatToString(deviceFormat[y]));
                    // serach for default audio device
                    if (captureAudioDevice == null)
                         if (deviceFormat[y] instanceof AudioFormat)
                         if (deviceInfo.getName().indexOf(defaultAudioDeviceName) >= 0)
                         captureAudioDevice = deviceInfo;
                         Stdout.log(">>> capture audio device = " + deviceInfo.getName());
                    // search for default audio format
                    if (captureAudioDevice == deviceInfo)
                         if (captureAudioFormat == null)
                         if (DeviceInfo.formatToString(deviceFormat[y]).indexOf(defaultAudioFormatString) >= 0)
                         captureAudioFormat = (AudioFormat) deviceFormat[y];
                         Stdout.log(">>> capture audio format = " + DeviceInfo.formatToString(deviceFormat[y]));
                    if (debugDeviceList)
                         Stdout.log(" - format: " + DeviceInfo.formatToString(deviceFormat[y]));
          Stdout.log("... list completed.");
          // if args[x] = "-dd" terminate now
          if (debugDeviceList)
               System.exit(0);
          // setup video data source
          MediaLocator videoMediaLocator = captureVideoDevice.getLocator();
          DataSource videoDataSource = null;
          try
               videoDataSource = javax.media.Manager.createDataSource(videoMediaLocator);
          catch (IOException ie) { Stdout.logAndAbortException(ie); }
          catch (NoDataSourceException nse) { Stdout.logAndAbortException(nse); }
          if (! DeviceInfo.setFormat(videoDataSource, captureVideoFormat))
               Stdout.log("Error: unable to set video format - program aborted");
               System.exit(0);
          // setup audio data source
          MediaLocator audioMediaLocator = captureAudioDevice.getLocator();
          DataSource audioDataSource = null;
          try
               audioDataSource = javax.media.Manager.createDataSource(audioMediaLocator);
          catch (IOException ie) { Stdout.logAndAbortException(ie); }
          catch (NoDataSourceException nse) { Stdout.logAndAbortException(nse); }
          if (! DeviceInfo.setFormat(audioDataSource, captureAudioFormat))
               Stdout.log("Error: unable to set audio format - program aborted");
               System.exit(0);
          // merge the two data sources
          DataSource mixedDataSource = null;
          try
               DataSource dArray[] = new DataSource[2];
               dArray[0] = videoDataSource;
               dArray[1] = audioDataSource;
               mixedDataSource = javax.media.Manager.createMergingDataSource(dArray);
          catch (IncompatibleSourceException ise) { Stdout.logAndAbortException(ise); }
          // create a new processor
          // setup output file format ->> msvideo
          FileTypeDescriptor outputType = new FileTypeDescriptor(FileTypeDescriptor.MSVIDEO);
          // setup output video and audio data format
          Format outputFormat[] = new Format[2];
          outputFormat[0] = new VideoFormat(VideoFormat.INDEO50);
          outputFormat[1] = new AudioFormat(AudioFormat.GSM_MS /* LINEAR */);
          // create processor
          ProcessorModel processorModel = new ProcessorModel(mixedDataSource, outputFormat, outputType);
          Processor processor = null;
          try
               processor = Manager.createRealizedProcessor(processorModel);
          catch (IOException e) { Stdout.logAndAbortException(e); }
          catch (NoProcessorException e) { Stdout.logAndAbortException(e); }
          catch (CannotRealizeException e) { Stdout.logAndAbortException(e); }
          // get the output of the processor
          DataSource source = processor.getDataOutput();
          // create a File protocol MediaLocator with the location
          // of the file to which bits are to be written
          MediaLocator dest = new MediaLocator("file:testcam.avi");
          // create a datasink to do the file
          DataSink dataSink = null;
          MyDataSinkListener dataSinkListener = null;
          try
               dataSink = Manager.createDataSink(source, dest);
               dataSinkListener = new MyDataSinkListener();
               dataSink.addDataSinkListener(dataSinkListener);
               dataSink.open();
          catch (IOException e) { Stdout.logAndAbortException(e); }
          catch (NoDataSinkException e) { Stdout.logAndAbortException(e); }
          catch (SecurityException e) { Stdout.logAndAbortException(e); }
          // now start the datasink and processor
          try
               dataSink.start();
          catch (IOException e) { Stdout.logAndAbortException(e); }
          processor.start();
          Stdout.log("starting capturing ...");
          try { Thread.currentThread().sleep(10000); } catch (InterruptedException ie) {}     // capture for 10 seconds
          Stdout.log("... capturing done");
          // stop and close the processor when done capturing...
          // close the datasink when EndOfStream event is received...
          processor.stop();
          processor.close();
          dataSinkListener.waitEndOfStream(10);
          dataSink.close();
          Stdout.log("[all done]");
}finally search with the athour name there is an additional program u must download to detect ur cam .
i hope that is work with u

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Capture desktop image continuously

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