javaprintingstreambarcodebufferedimage
java.awt.Image.BufferedImage barcode sent to print results in whitespace
I'm using Barcode4J library to generate barcodes. I am returned a BufferedImage that I can display as an ImageIcon on a JLabel and save to a file but I can't for the life of me print it to a printer, the drawString and drawRect work as expected but the image is blank. I've posted some code below; I don't know how to make it a SSCCE of this but if anyone can point me in any direction I would be most grateful.
snippet:
import org.krysalis.barcode4j.impl.code128.Code128Bean;
import org.krysalis.barcode4j.output.bitmap.BitmapCanvasProvider;
import org.krysalis.barcode4j.tools.UnitConv;
public class BarcodeBean extends Code128Bean implements Printable{
BufferedImage _bImage;
public void createBarcode2Print(BarcodeBean bean, String barcodeValue) throws FileNotFoundException, IOException {
final int dpi = 150;
BufferedImage image;
BitmapCanvasProvider canvas = null;
if (barcodeValue == null) {
barcodeValue = "0123456789-000-0001";
}
bean.setModuleWidth(UnitConv.in2mm(2.0f / dpi));
bean.doQuietZone(false);
try {
canvas = new BitmapCanvasProvider(
dpi, BufferedImage.TYPE_BYTE_BINARY, false, 0);
//Generate the barcode
bean.generateBarcode(canvas, barcodeValue);
image = canvas.getBufferedImage();
//Signal end of generation
// canvas.finish();
} finally {
canvas.finish();
}
printImage(image);
int stop = 0;
}
public void printImage(BufferedImage arg_image){
_bImage = arg_image;
createLabel();
}
private void createLabel() {
PrinterJob printJob = PrinterJob.getPrinterJob();
Book book = new Book();
PageFormat format = new PageFormat();
format.setOrientation(PageFormat.PORTRAIT);
java.awt.print.Paper paper = new java.awt.print.Paper();
paper.setSize(612.0, 792.0); //portrait
double hgt = paper.getHeight();
double wdth = paper.getWidth();
paper.setImageableArea(0, 0, wdth, hgt);
format.setPaper(paper);
book.append(this, format);
printJob.setPageable(book);
if (printJob.printDialog()) {
try {
printJob.print();
} catch (PrinterException ex) {
ex.printStackTrace();
}
}
}
@Override
public int print(Graphics graphics, PageFormat pageFormat, int pageIndex) throws PrinterException {
Graphics2D graphics2d = (Graphics2D)graphics;
graphics2d.translate(pageFormat.getImageableX(), pageFormat.getImageableY());
graphics.setColor(Color.black);
graphics2d.setColor(Color.black);
int imageWidth = _bImage.getWidth(null); // 378
int imageHeight = _bImage.getHeight(null); // 110
int imageableWidth = (int)pageFormat.getImageableWidth(); // 612
int imageableHeight = (int)pageFormat.getImageableHeight(); // 792
graphics2d.drawString("Print barcode between this and...", 10, 30);
graphics2d.drawRect(10, 40, imageWidth, imageHeight);
graphics2d.drawImage(_bImage, 10, 60, imageWidth, imageHeight, null);
graphics2d.drawString("This.............................", 10, 180);
graphics2d.dispose();
return Printable.PAGE_EXISTS;
}
}
Solution
I can't say I know why, it's possible that the Barcode4J is using their own implementation of BufferedImage or something, but, if I make a copy of the BufferedImage returned from Barcode4J, I can make it work.
What I mean by that is, if I create a new instance of BufferedImage and draw the instance from Barcode4J onto it and use it, I can make it work...
canvas = new BitmapCanvasProvider(
dpi, BufferedImage.TYPE_BYTE_BINARY, false, 0);
bean.generateBarcode(canvas, barcodeValue);
BufferedImage bardcode = canvas.getBufferedImage();
image = new BufferedImage(bardcode.getWidth(), bardcode.getHeight(), BufferedImage.TYPE_INT_ARGB);
Graphics2D g2d = image.createGraphics();
g2d.drawImage(bardcode, 0, 0, null);
g2d.dispose();
graphics2d.dispose();← That might be the problem. Never dispose of a Graphics unless you created it.
👆 is really good advice! Unfortunately, in this case it didn't help, but you should listen to it anyway!
Also, this return Printable.PAGE_EXISTS;, could have you running around in circles. You need to tell the caller when there are no more pages to be printed.
Runnable example...
import java.awt.Color;
import java.awt.EventQueue;
import java.awt.Graphics;
import java.awt.Graphics2D;
import java.awt.GridBagConstraints;
import java.awt.GridBagLayout;
import java.awt.event.ActionEvent;
import java.awt.event.ActionListener;
import java.awt.image.BufferedImage;
import java.awt.print.PageFormat;
import java.awt.print.Paper;
import java.awt.print.Printable;
import java.awt.print.PrinterException;
import java.awt.print.PrinterJob;
import java.io.FileNotFoundException;
import java.io.IOException;
import javax.swing.ImageIcon;
import javax.swing.JButton;
import javax.swing.JFrame;
import javax.swing.JLabel;
import javax.swing.JPanel;
import org.krysalis.barcode4j.impl.code128.Code128Bean;
import org.krysalis.barcode4j.output.bitmap.BitmapCanvasProvider;
import org.krysalis.barcode4j.tools.UnitConv;
public class Main {
public static void main(String[] args) {
new Main();
}
public Main() {
EventQueue.invokeLater(new Runnable() {
@Override
public void run() {
JFrame frame = new JFrame();
frame.add(new TestPane());
frame.pack();
frame.setLocationRelativeTo(null);
frame.setVisible(true);
}
});
}
public class TestPane extends JPanel {
private BufferedImage barcodeImage;
public TestPane() throws IOException {
setLayout(new GridBagLayout());
barcodeImage = createBarcode2Print(new Code128Bean(), "0123456789-000-0001");
GridBagConstraints gbc = new GridBagConstraints();
gbc.gridwidth = GridBagConstraints.REMAINDER;
add(new JLabel(new ImageIcon(barcodeImage)), gbc);
JButton print = new JButton("Print");
add(print, gbc);
print.addActionListener(new ActionListener() {
@Override
public void actionPerformed(ActionEvent e) {
printIt();
}
});
}
protected void printIt() {
PrinterJob pj = PrinterJob.getPrinterJob();
if (pj.printDialog()) {
PageFormat pf = pj.defaultPage();
Paper paper = pf.getPaper();
pf.setOrientation(PageFormat.PORTRAIT);
pf.setPaper(paper);
PageFormat validatePage = pj.validatePage(pf);
// System.out.println("Valid- " + dump(validatePage));
pj.setPrintable(new BarCodePrintable(barcodeImage), validatePage);
try {
pj.print();
} catch (PrinterException ex) {
ex.printStackTrace();
}
}
}
}
public class BarCodePrintable implements Printable {
private BufferedImage barcodeImage;
public BarCodePrintable(BufferedImage barcodeImage) {
this.barcodeImage = barcodeImage;
}
@Override
public int print(Graphics graphics, PageFormat pageFormat, int pageIndex) throws PrinterException {
Graphics2D graphics2d = (Graphics2D) graphics;
graphics2d.translate(pageFormat.getImageableX(), pageFormat.getImageableY());
graphics.setColor(Color.black);
graphics2d.setColor(Color.black);
int imageWidth = barcodeImage.getWidth(); // 378
int imageHeight = barcodeImage.getHeight(); // 110
int imageableWidth = (int) pageFormat.getImageableWidth(); // 612
int imageableHeight = (int) pageFormat.getImageableHeight(); // 792
graphics2d.drawString("Print barcode between this and...", 10, 30);
graphics2d.drawRect(10, 40, imageWidth, imageHeight);
graphics2d.drawImage(barcodeImage, 10, 60, null);
graphics2d.drawString("This.............................", 10, 180);
//graphics2d.dispose();
return pageIndex == 0 ? Printable.PAGE_EXISTS : Printable.NO_SUCH_PAGE;
}
}
public BufferedImage createBarcode2Print(Code128Bean bean, String barcodeValue) throws FileNotFoundException, IOException {
final int dpi = 300;
BufferedImage image = null;
BitmapCanvasProvider canvas = null;
if (barcodeValue == null) {
barcodeValue = "0123456789-000-0001";
}
bean.setModuleWidth(UnitConv.in2mm(2.0f / dpi));
bean.doQuietZone(false);
try {
canvas = new BitmapCanvasProvider(
dpi, BufferedImage.TYPE_BYTE_BINARY, false, 0);
bean.generateBarcode(canvas, barcodeValue);
BufferedImage bardcode = canvas.getBufferedImage();
image = new BufferedImage(bardcode.getWidth(), bardcode.getHeight(), BufferedImage.TYPE_INT_ARGB);
Graphics2D g2d = image.createGraphics();
g2d.drawImage(bardcode, 0, 0, null);
g2d.dispose();
} finally {
canvas.finish();
}
return image;
}
}
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