ESCPOS打印机图像显示故障

Question

我正在进行一个项目，该项目从通用源读取数据，使用swing生成图像，而不是将图像(一行图像)转换为托管命令并将其发送到打印机。

为了将图像传输到escpos代码，我使用了图像打印材料，但做了一些小改动：

            int n = 0;
            bos.write(printerSchema.getLineSpace24());
            for (int y = 0; y < image.length; y += 24) {
                // Like I said before, when done sending data,
                // the printer will resume to normal text printing
                if (n == 2) {
                    bos.write(printerSchema.getCutPaper());
                }
                bos.write(printerSchema.getImageMode());
                // Set nL and nH based on the width of the image
                bos.write(new byte[] { (byte) (0x00ff & image[y].length), (byte) ((0xff00 & image[y].length) >> 8) });
                for (int x = 0; x < image[y].length; x++) {
                    // for each stripe, recollect 3 bytes (3 bytes = 24 bits)
                    bos.write(recollectSlice(y, x, image));
                }

                // Do a line feed, if not the printing will resume on the same
                // line
                bos.write(printerSchema.getLineFeed());
                n++;

修改是一个“剪纸命令”，在绘制第二行之后(实际上，打印机在切割器和打印机头之间有很大的空间)。

一切看起来都很好，但有时我会随机地收到第二行缺失(总是在剪纸命令之前)，有时是缺少空格(第一行和第三行只是在一起)，有时是空白。

打印机: Sam4s Giant-100命令：

    INIT_PRINTER = new byte[]{0x1B,0x40},//1B 40 Initialize printer
    IMAGE_MODE = new byte[] { 0x1B, 0x2A, 33 }, LINE_FEED = new byte[] { 0x0A },
    LINE_SPACE_24 = new byte[] { 0x1B, 0x33, 24 }, LINE_SPACE_30 = new byte[] { 0x1B, 0x33, 30 },
    CUT_PAPER = new byte[] { 29, 86, 1 }; // 1B 33 n

将问题定位在零件上

如果(n == 2) { bos.write(printerSchema.getCutPaper())；}它之前的线没有绘制。

Answer 1

您可以使用咖啡图书馆和使用提要的打印图像可以这样工作：

            /*
             * to print one image we need to have:
             * - one BufferedImage.
             * - one bitonal algorithm to define what and how print on image.
             * - one image wrapper to determine the command set to be used on 
             * image printing and how to customize it.
             */

            // creating the EscPosImage, need buffered image and algorithm.
            URL imageURL = getURL("dog.png"); 
            BufferedImage  imageBufferedImage = ImageIO.read(imageURL);


            // this wrapper uses esc/pos sequence: "GS 'v' '0'"
            RasterBitImageWrapper imageWrapper = new RasterBitImageWrapper();



            escpos = new EscPos(new PrinterOutputStream(printService));


            escpos.feed(5);
            escpos.writeLF("BitonalThreshold()");
            // using bitonal threshold for dithering
            Bitonal algorithm = new BitonalThreshold(); 
            EscPosImage escposImage = new EscPosImage(imageBufferedImage, algorithm);     
            escpos.write(imageWrapper, escposImage);

            escpos.feed(5);

            escpos.cut(EscPos.CutMode.PART);