No device found error

Question

i got a very strange problem i m working on a video chat program
& after full testing it i installed it on a client who has a brand name pc ".fujitsu-siemens" with windows home edition sp2 but it always gives me no device detected
the error happened in this method :
public void setMainSource(){
           setProcessing(false);
           vidformat = new VideoFormat(VideoFormat.RGB);         
           Vector devices = CaptureDeviceManager.getDeviceList(vidformat);
           CaptureDeviceInfo di = null;
           if (devices.size() > 0) {
               System.err.println("num of : " + devices.size());
                    di = (CaptureDeviceInfo) devices.elementAt(i);
           else {
               JOptionPane.showMessageDialog(parent,
                  "Your camera is not connected", "No webcam found", JOptionPane.WARNING_MESSAGE);
            audioFormat = new AudioFormat("linear", 8000, 8, 1,AudioFormat.LITTLE_ENDIAN,AudioFormat.UNSIGNED);           
           Vector device = CaptureDeviceManager.getDeviceList(audioFormat);
           CaptureDeviceInfo audioDi = null;
           if(device.size() > 0)
               audioDi = (CaptureDeviceInfo) device.elementAt(0);
           else{
                              JOptionPane.showMessageDialog(parent,
                  "Your mic is not connected", "No mic found", JOptionPane.WARNING_MESSAGE);
           try {
               ml = di.getLocator();             
               setMainCamSource(Manager.createDataSource(ml));
             // setMainCamSource(Manager.createCloneableDataSource(getMainCamSource()));
             //setAudioSource(Manager.createCloneableDataSource(getAudioSource())); 
           } catch (Exception e) {
               JOptionPane.showMessageDialog(parent,
                  "num 0 :Exception locating media: " + e.getMessage(), "Error", JOptionPane.WARNING_MESSAGE);
            try {           
               m2 = audioDi.getLocator();
               setAudioSource(Manager.createDataSource(m2));
              // setAudioSource(Manager.createCloneableDataSource(getAudioSource())); 
           } catch (Exception e) {
               JOptionPane.showMessageDialog(parent,
                  "num 00 :Exception locating media: " + e.getMessage(), "Error", JOptionPane.WARNING_MESSAGE);
           try{
              DataSource[] dataSourceArr = new DataSource[2];
              dataSourceArr[0] = getMainCamSource();
              dataSourceArr[1] = getAudioSource();
              mergeDataSource = Manager.createMergingDataSource(dataSourceArr);
           }catch(Exception e){
                JOptionPane.showMessageDialog(parent,
                  "num 000 :Exception locating media: " + e.getMessage(), "Error", JOptionPane.WARNING_MESSAGE);
       }after runing it gives me "no web cam " msg box & "no mic " msgBox
i tried in a lot of other computers with different platforms & it worked perfectly
plzzzzzzzzzzzz somebody help me....
Message was edited by:
Meto4

Answer 1

in the JMFregistry the camera & the sound device is already detected & i can even capture them using jmstudio but
though the jmstudio is fully working
Vector devices = CaptureDeviceManager.getDeviceList(null);,
Vector devices = CaptureDeviceManager.getDeviceList(vidformat);or
Vector devices = CaptureDeviceManager.getDeviceList(audioFormat);return empty vector