电脑摄像头扫描二维码并解码
程序是日本人写的那个二维码qrcode.zip包里面的jmf
错误：
Exception in thread "Thread-3" java.lang.IllegalArgumentException: Width (0) and height (0) cannot be <= 0
at java.awt.image.DirectColorModel.createCompatibleWritableRaster(DirectColorModel.java:999)
at java.awt.image.BufferedImage.<init>(BufferedImage.java:312)
at jmf.J2SEImage.<init>(QRCodeDecoderJMFExample.java:93)
at jmf.QRCodeDecoderJMFExample.run(QRCodeDecoderJMFExample.java:56)
at java.lang.Thread.run(Thread.java:619)


源代码：
import java.awt.Canvas;
import java.awt.Color;
import java.awt.Graphics;
import java.awt.Graphics2D;
import java.awt.Image;
import java.awt.image.BufferedImage;
import java.awt.image.PixelGrabber;
import java.io.File;
import java.io.IOException;
import javax.imageio.ImageIO;
import javax.media.Buffer;
import javax.media.Processor;
import javax.media.control.FrameGrabbingControl;
import javax.media.format.VideoFormat;
import javax.media.util.BufferToImage;
import jp.sourceforge.qrcode.QRCodeDecoder;
import jp.sourceforge.qrcode.data.QRCodeImage;
import jp.sourceforge.qrcode.exception.DecodingFailedException;
import jp.sourceforge.qrcode.geom.Line;
import jp.sourceforge.qrcode.geom.Point;
import jp.sourceforge.qrcode.util.DebugCanvas;
public class QRCodeDecoderJMFExample implements Runnable {
Processor processor;
QRCodeDecoder decoder;
JMFCanvas canvas;
public QRCodeDecoderJMFExample(Processor processor) {
this.processor = processor;
}
public BufferedImage getDebugImage() {
return canvas.getImage();
}
public  void run() {
for (;;) {
        FrameGrabbingControl fgc = (FrameGrabbingControl) processor.getControl("javax.media.control.FrameGrabbingControl");
        Buffer buf = fgc.grabFrame();
        BufferToImage btoi = new BufferToImage((VideoFormat)buf.getFormat());
        Image img = btoi.createImage(buf);
        QRCodeDecoder decoder = new QRCodeDecoder();
        int width = processor.getVisualComponent().getWidth();
        int height = processor.getVisualComponent().getHeight();
        canvas = new JMFCanvas();
        QRCodeDecoder.setCanvas(canvas);
        try {
        J2SEImage decoderImage = new J2SEImage(img, width, height);
                        byte[] b=decoder.decode(decoderImage);
                        String decodedString;
                        if(b!=null)
            decodedString=new String(decoder.decode(decoderImage));
                        else
                            decodedString="";
        System.out.println("Result: "+ decodedString);
        File resultImage = new File("C:\\img\\TestQRCode.JPG");
        try {
        ImageIO.write(canvas.getImage(), "png", resultImage);
        } catch (IOException e) {
        System.out.println("失败");
        System.out.println(e.getMessage());
        }
        } catch (DecodingFailedException e) {
//         System.out.println("Error: "+e.getMessage());
                    System.out.println("Error: 解码失败");
        } catch (IllegalStateException e) {
//         System.out.println("Error: "+e.getMessage());
                    System.out.println("Error: 状态错误");
        }
        try {
        Thread.sleep(500);
        } catch (InterruptedException e) {
        System.out.println(e.getMessage());
        }
}
}
}
class J2SEImage implements QRCodeImage {
BufferedImage image;
int[] pixels;
PixelGrabber pg;
public J2SEImage(Image img, int width, int height) {
image = new BufferedImage(width, height, BufferedImage.TYPE_INT_RGB);
Graphics2D g2 = image.createGraphics();
g2.drawImage(img, null, null);
}

public int getWidth() {
return image.getWidth();
}

public int getHeight() {
return image.getHeight();
}

public int getPixel(int x, int y) {
return image.getRGB(x, y);
}
}
class JMFCanvas extends Canvas implements DebugCanvas {
BufferedImage image;
public void paint(Graphics g){
if (image != null)
g.drawImage(image, 0, 0, java.awt.Color.WHITE, null);
}
public  void println(String string){
//System.out.println(string);
}
public  void drawMatrix(boolean[][] matrix) {
if (image == null) {
image = new BufferedImage(matrix.length, matrix[0].length, BufferedImage.TYPE_INT_ARGB);
setSize(matrix.length, matrix[0].length);
}
Graphics2D g2d = image.createGraphics();
g2d.setColor(java.awt.Color.WHITE);
int width = getWidth();
for (int x = 0; x < matrix.length; x++) {
g2d.drawLine(x, 0, x, width);
}
g2d.setColor(java.awt.Color.BLACK);
for (int x = 0; x < matrix.length; x++) {
for (int y = 0; y < matrix[0].length; y++) {
if (matrix[x][y] == true)
g2d.drawLine(x, y, x, y);
}
}
repaint();
}
public  void drawLine(Line line, int color){
Graphics2D g2d = image.createGraphics();
g2d.setColor(new Color(color));
g2d.drawLine(line.getP1().getX(), line.getP1().getY(),
line.getP2().getX(), line.getP2().getY());
repaint();
}
public  void drawLines(Line[] lines, int color){
Graphics2D g2d = image.createGraphics();
g2d.setColor(new Color(color));
for (int i = 0; i < lines.length; i++) {
g2d.drawLine(lines[i].getP1().getX(), lines[i].getP1().getY(),
lines[i].getP2().getX(), lines[i].getP2().getY());
}
repaint();
}
public  void drawPolygon(Point[] points, int color){
Graphics2D g2d = image.createGraphics();
g2d.setColor(new Color(color));
int numPoints = points.length;
int[] polygonX = new int[numPoints];
int[] polygonY = new int[numPoints];
for (int i = 0; i < numPoints; i++) {
polygonX[i] = points[i].getX();
polygonY[i] = points[i].getY();
}
g2d.drawPolygon(polygonX, polygonY, numPoints);
repaint();
}
public  void drawPoints(Point[] points, int color){
Graphics2D g2d = image.createGraphics();
g2d.setColor(new Color(color));
for (int i = 0; i < points.length; i++)
g2d.drawLine(points[i].getX(), points[i].getY(),points[i].getX(), points[i].getY());
repaint();

}
public  void drawPoint(Point point, int color){
Graphics2D g2d = image.createGraphics();
g2d.setColor(new Color(color));
g2d.drawLine(point.getX(), point.getY(),point.getX(), point.getY());
repaint();

}
public  void drawCross(Point point, int color){
int x = point.getX();
int y = point.getY();

Line[] lines = {
new Line(x - 5, y-1, x + 5, y-1),new Line(x-1, y - 5, x-1 ,y + 5),
new Line(x - 5, y+1, x + 5, y+1),new Line(x+1, y - 5, x+1 ,y + 5),
new Line(x - 5, y, x + 5, y),new Line(x, y - 5, x ,y + 5)
};
drawLines(lines, color);
}
public BufferedImage getImage() {
return image;
}
public void setImage(BufferedImage image) {
this.image = image;
}
}


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