内容简介:翻译自:https://stackoverflow.com/questions/46094778/zebra-printer-gc420t-not-printing-an-image-epl-2-gw
,但没有任何作用.
码:
public void generateReport(Map<String, Object> parameters, List<Label> labels) throws JRException, IOException, ConnectionException, ZebraPrinterLanguageUnknownException{ // TODO Auto-generated method stub JRBeanCollectionDataSource dataSource = new JRBeanCollectionDataSource(labels); System.out.println(" Wait !!"); JasperPrint jasperPrint = JasperFillManager.fillReport(jasperReport, parameters, dataSource); if(jasperPrint != null && jasperPrint.getPages()!=null && jasperPrint.getPages().size()>=0){ FileOutputStream fos = new FileOutputStream("C:\\Users\\desktop\\Labels.png"); //JasperExportManager.exportReportToPdfStream(jasperPrint, fos); BufferedImage rendered_image = null; rendered_image = (BufferedImage) JasperPrintManager.printPageToImage(jasperPrint, 0, 1.6f); ImageIO.write(rendered_image, "png", fos); Connection thePrinterConn = new DriverPrinterConnection("GC420t"); try{ for (DiscoveredPrinterDriver printer : UsbDiscoverer.getZebraDriverPrinters()){ System.out.println(printer); } thePrinterConn.open(); if(zPrinter==null){ zPrinter = ZebraPrinterFactory.getInstance(thePrinterConn); } PrinterStatus printerStatus = zPrinter.getCurrentStatus(); if(printerStatus.isReadyToPrint){ System.out.println("Ready to print !!"); DocFlavor flavor = DocFlavor.INPUT_STREAM.AUTOSENSE; DocAttributeSet das = new HashDocAttributeSet(); FileInputStream fis = new FileInputStream("C:\\Users\\desktop\\Labels.png"); Doc mydoc = new SimpleDoc(fis, flavor, das); PrintRequestAttributeSet aset = new HashPrintRequestAttributeSet(); aset.add(OrientationRequested.PORTRAIT); @SuppressWarnings("unused") PrinterJob pj = PrinterJob.getPrinterJob(); PrintService[] services = PrintServiceLookup.lookupPrintServices(flavor, aset); PrintService defaultService = PrintServiceLookup.lookupDefaultPrintService(); for (int i = 0; i < services.length; i++){ System.out.println(services[i].getName()); } if(services.length == 0){ if(defaultService == null){ //no printer found } else{ //print using default DocPrintJob job = defaultService.createPrintJob(); try{ job.print(mydoc, aset); }catch (PrintException e){ // TODO Auto-generated catch block e.printStackTrace(); } } } else{ PrintService service = ServiceUI.printDialog(null, 200, 200, services, defaultService, flavor, aset); if (service != null){ DocPrintJob job = service.createPrintJob(); try{ job.print(mydoc, aset); }catch(PrintException e){ // TODO Auto-generated catch block e.printStackTrace(); } } } //ZebraImageI image = ZebraImageFactory.getImage("C:\\Users\\desktop\\Labels.png"); } else{ System.out.println("Something went wrong"); } }finally{ thePrinterConn.close(); } System.out.println("Report generated !!"); } }
我阅读了 EPL 2 manual 并将图像转换为二进制图形数据以立即打印.
码:
private byte[] getEplGraphics(int top, int left, BufferedImage bufferedImage) throws IOException { ByteArrayOutputStream fs = new ByteArrayOutputStream(); //int canvasWidth = bufferedImage.getWidth(); // loop from top to bottom System.out.println(bufferedImage.getHeight()); System.out.println(bufferedImage.getWidth()); int maxY = bufferedImage.getHeight() + (64- bufferedImage.getHeight()%64); int maxX = bufferedImage.getWidth() + (64- bufferedImage.getWidth()%64); System.out.println(maxX); System.out.println(maxY); int p3 = maxX / 8; int p4 = maxY/ 8; int len = 0; String gw = "N\nGW0,0," + p3 + "," + p4 + ","; fs.write(gw.getBytes()); for (int y = 0; y < maxY; ++y) { // from left to right for (int x = 0; x < maxX;) { byte abyte = 0; // get 8 bits together and write to memory for (int b = 0; b < 8; ++b, ++x) { // set 1 for white,0 for black int dot = 1; // pixel still in width of bitmap, // check luminance for white or black, out of bitmap set to white if (x < bufferedImage.getWidth() && y < bufferedImage.getHeight()) { int c = bufferedImage.getRGB(x, y); int red = (c & 0x00ff0000) >> 16; int green = (c & 0x0000ff00) >> 8; int blue = c & 0x000000ff; Color color = new Color(red, green, blue); int luminance = (int) ((color.getRed() * 0.3) + (color.getGreen() * 0.59) + (color.getBlue() * 0.11)); dot = luminance > 127 ? 1 : 0; } abyte |= (byte) (dot << (7 - b)); // shift left, // then OR together to get 8 bits into a byte } // System.out.print( (char)(abyte + 48 ) ); // write here len++; fs.write(abyte); } } System.out.println("GW Length::"+len); // Assign memory position here // fs.write('\n'); fs.write("\nP1".getBytes()); fs.flush(); // System.out.println(fs); return fs.toByteArray(); }
将图像转换为二进制图形数据后,它不会打印数据.
如何让打印机打印图像?
使用jasper-reports,渲染图像,将图像转换为EPL并发送到zebra打印机,通常不是在热敏打印机上打印的正确解决方案.这种代码不仅速度较慢,而且您的分辨率也较低(例如条形码可能会产生问题)
您有两个标准选项
>使用打印机协议并发送文本文件.
>安装打印机驱动程序并使用 JRPrintServiceExporter
使用打印机协议
这就是我通常使用的(主要是为了获得完美的代码条打印,没有图像,但直接命令打印代码栏).您不会为此使用jasper-reports,而是设置您的txt文件(您可以在案例 zebra-designer 中使用设计程序),然后使用像 freemarker 这样的库来替换/插入直接协议文件中的动态数据.完成后,您可以直接将其发送到打印机,例如通过串口(也可以使用蓝牙 – 串行适配器无线)
用打印机驱动
在此解决方案中,您需要安装正确的打印机驱动程序,然后使用此驱动程序发送打印作业.在jasper-report发送打印机作业时,您使用以下代码:
PrintRequestAttributeSet printRequestAttributeSet = new HashPrintRequestAttributeSet(); //set page size etc if you need to PrintServiceAttributeSet printServiceAttributeSet = new HashPrintServiceAttributeSet(); //set print service attributes JRPrintServiceExporter exporter = new JRPrintServiceExporter(); exporter.setExporterInput(new SimpleExporterInput(jasperPrint)); SimplePrintServiceExporterConfiguration expConfig = new SimplePrintServiceExporterConfiguration(); String printerName = "myPrinterName"; //Check the name of printer PrintService service = Printerlookup.getPrintservice(printerName, Boolean.TRUE, Boolean.TRUE); expConfig.setPrintService(service); expConfig.setPrintRequestAttributeSet(printRequestAttributeSet); expConfig.setPrintServiceAttributeSet(printServiceAttributeSet); expConfig.setDisplayPageDialog(Boolean.FALSE); exporter.setConfiguration(expConfig); exporter.exportReport();
如果您的打印方式不正确,则调试方法是 export to pdf ,然后使用pdf中的打印对话框打印到打印机(请记住您正在使用驱动程序,因此您可以在对话框中选择它)
随着pdf
>它打印正确! – 废话,这很奇怪,但你有一个解决方法(导出到PDF和打印)
>它打印不正确! – 废话,驱动程序不能正常工作(联系供应商),当他们正在工作时尝试不同的图像类型(我会尝试.bmp),检查打印机对话框中的所有设置(这些你可以设置为以后printRequestAttributeSet).
I don’t care, I’m actually only interested in converting png to EPL2 language
请更新问题,删除jasper,然后显示png图像,显示预期输出并显示当前输出,这是一些可以帮助您解决此问题的代码,但首先要确保您真的不关心:
Use ZEBRA SDK 参见printImage命令
ZebraPrinter printer = ZebraPrinterFactory.getInstance(connection); printer.printImage("sample.jpg", x, y);
Using the EPL2 GW command 它在C#中,但语言类似
How to convert image to PCX 请参阅code.zip文件ToPCX.java
翻译自:https://stackoverflow.com/questions/46094778/zebra-printer-gc420t-not-printing-an-image-epl-2-gw
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