Girish Vankayala

Here is my code for displaying the printer dialog and the printing

public void initializeAndPrint() { // Create printer selection dialog and open it PrintDialog printDialog = new PrintDialog(shell, SWT.APPLICATION_MODAL); PrinterData printerData = printDialog.open(); // Check if OK was pressed if (printerData != null) { printerData.orientation = pageOrientation; // Create new Printer instance Printer printer = new Printer(printerData); // Open printing task if (!printer.startJob("Print Screen")) { System.out.println("Starting printer failed"); } else { // Print first page if (!printer.startPage()) { System.out.println("Printing failed"); } else { printScreen(printer); } } } } private void printScreen(Printer printer) { GC gc = new GC(printer); float scaleW = 0; float scaleH = 0; float scale = 1; Image swtImage = new Image(display, convertToSWT(imageToBePrinted)); if (resize) { scaleW = new Float((float)printer.getClientArea().width / swtImage.getBounds().width); scaleH = new Float((float)printer.getClientArea().height / swtImage.getBounds().height); scale = Math.min(scaleW, scaleH); } else { scaleW = 1; scaleH = 1; } Transform transform = new Transform(display); transform.scale(scale, scale); gc.setTransform(transform); gc.drawImage(swtImage, 0, 0); StringBuilder blder = new StringBuilder(CalendarUtils.getToday().toString()); if (StringUtils.isNotBlank(build)) { blder.append(" Build: " + build); } Font font = new Font(display, "Arial", 14, SWT.BOLD); gc.setFont(font); // print today and build dates gc.drawString(blder.toString(), 0, swtImage.getBounds().height - (gc.stringExtent(blder.toString()).y + 5)); printer.endPage(); printer.endJob(); // Release operating system resources font.dispose(); gc.dispose(); printer.dispose(); }

This works fine on windows but not on a Linux machine.
The Printer Selection dialog is displayed and after the user selects a printer, it does not print.
There is no printer job created either.

Don't know if I am doing something wrong or if it is a problem with the SWT Linux jar.
The Linux system uses a different SWT jar, a 64 bit gtk jar.

System configuration:
OS Name: Linux
OS Version: 2.6.24-26-generic
Architecture: amd64

Thanks a lot in advance for your help.

Thank You for your reply Rob. I will make sure I use the "code" tags next time. That was my first post

I heard today that there is more than one client with the same problem. I will ask one who had this problem yesterday to update their printer drivers and check if it fixes the problem. We usually tell the clients to update their Java when we have a problem like this but this client is on Java 1.6.0_17.

Thank You again for your reply.

My application has a print screen button. Off late a few clients have sent in a few error reports. This is an example stack trace:

StackTrace:
java.lang.IllegalArgumentException: crossFeedResolution is < 1 at javax.print.attribute.ResolutionSyntax.<init>(Unknown Source) at javax.print.attribute.standard.PrinterResolution.<init>(Unknown Source) at sun.awt.windows.WPrinterJob.setResolutionDPI(Unknown Source) at sun.awt.windows.WPrintDialogPeer._show(Native Method) at sun.awt.windows.WPrintDialogPeer.access$000(Unknown Source) at sun.awt.windows.WPrintDialogPeer$1.run(Unknown Source) at java.lang.Thread.run(Unknown Source)

I have not been able to duplicate the problem myself but a client told me that this happens often (does'nt happen everytime they click the "Print Screen" button), and when it fails it causes the application to freeze and they have to terminate the app using the "Task Manager".

Here is the action my "Print Screen" button is bound to:

public void printScreen() { try { int format = PageFormat.LANDSCAPE; PrintUtilities printer = new PrintUtilities(createScreenShotFile(window, saveImageFile), format, AppConstants.BUILD); // submit callable printer which calls the print() method in PrintUtilities } catch (Throwable exception) { FlexJOptionPane.showMessageDialog(Session.getInstance().getApplicationFrame(), "Could not print the page", "Flex", FlexJOptionPane.ERROR_MESSAGE); } } }

Here is my implementation of the PrintUtilities class, with the print methods:

public class PrintUtilities implements Printable, Runnable, Callable<Object> { public void print() { PrinterJob printJob = PrinterJob.getPrinterJob(); PageFormat pageFormat = new PageFormat(); if (pageOrientation < 0) { pageFormat.setOrientation(printJob.defaultPage().getOrientation()); } else { pageFormat.setOrientation(pageOrientation); } printJob.validatePage(pageFormat); Paper paper = pageFormat.getPaper(); double width = paper.getWidth() / 72; double height = paper.getHeight() / 72; paper.setImageableArea(.25 * 72, .25 * 72, (width - .5) * 72, (height - .5) * 72); pageFormat.setPaper(paper); try { printJob.setPrintable(this, pageFormat); if (printJob.printDialog()) { printJob.print(); } } catch (Exception pe) { System.out.println("Error printing: " + pe); } } public int print(Graphics g, PageFormat pageFormat, int pageIndex) { if (pageIndex > 0) { return (NO_SUCH_PAGE); } double scaleW = 0; double scaleH = 0; double scale = 1; Graphics2D g2d = (Graphics2D)g; g2d.translate(pageFormat.getImageableX(), pageFormat.getImageableY()); if (resize) { scaleW = new Double(pageFormat.getImageableWidth() / imageToBePrinted.getWidth()) .doubleValue(); scaleH = new Double(pageFormat.getImageableHeight() / imageToBePrinted.getHeight()) .doubleValue(); scale = Math.min(scaleW, scaleH); } else { scaleW = 1.0; scaleH = 1.0; } AffineTransform transform = AffineTransform.getScaleInstance(scale, scale); g2d.drawRenderedImage(imageToBePrinted, transform); StringBuilder blder = new StringBuilder(new Date().toString()); if (StringUtils.isNotBlank(build)) { blder.append(" Build: " + build); } g2d.drawString(blder.toString(), 0, (int)pageFormat.getImageableHeight() - 5); return (PAGE_EXISTS); } }