Simple Webcam Capture to JPG

Question

I cannot figure this out.
All I want to do is write a simple program that will take a still capture from my webcam and save it as a JPG. I don't need any kind of GUI or drawing to the screen. I will be using it in a batch script to take a picture and upload to my website at a fixed interval.
I have been messing around with it for a long time and have had no success. Here is some code I wrote just now that won't work. I have imported things while trying different pieces of code, but I never took any of them out. That's why I import so many things.
As you can see, I throw the NoPlayerException and CannotRealizeException. I do not understand why I get these. Also, when I run the program the light on my webcam turns on so I know it's connecting at some level. The file saved test.jpg is not a capture but rather a black square. Is my error in getting the image from the webcam or in writing it onto the BufferedImage so I can the write it to the file?
Any help would be appreciated.
import javax.swing.*;
import javax.swing.event.*;
import java.io.*;
import javax.media.*;
import javax.media.format.*;
import javax.media.util.*;
import javax.media.control.*;
import javax.media.protocol.*;
import java.util.*;
import java.awt.*;
import java.awt.image.*;
import java.awt.event.*;
import com.sun.image.codec.jpeg.*;
import javax.imageio.ImageIO;
public class wc
     public static Player player = null;
     public static CaptureDeviceInfo di = null;
     public static MediaLocator ml = null;
     public static Buffer buf = null;
     public static Image img = null;
     public static BufferToImage btoi = null;
     public static void main(String[] args) throws IOException, NoPlayerException, CannotRealizeException
          String str = "vfw:Microsoft WDM Image Capture (Win32):0";
          di = CaptureDeviceManager.getDevice(str);
          ml = di.getLocator();
          player = Manager.createRealizedPlayer(ml);
          player.start();
          FrameGrabbingControl fgc = (FrameGrabbingControl)
          player.getControl("javax.media.control.FrameGrabbingControl");
          buf = fgc.grabFrame();
          btoi = new BufferToImage((VideoFormat)buf.getFormat());
          img = btoi.createImage(buf);
          BufferedImage bi = new BufferedImage(160, 120, BufferedImage.TYPE_INT_RGB);
          Graphics2D g2 = bi.createGraphics();
          g2.drawImage(img, null, null);
          File f = new File("test.jpg");
          ImageIO.write(bi, "jpg", f);
}

Answer 1

I have a question posted about this code, slightly modified in this thread:
http://forum.java.sun.com/thread.jspa?threadID=5310154&tstart=0
Would you check it out, I made a new thread because its not strictly related to this post.