java - ESCPOS 打印机图像输出故障

Question

我正在开发一个项目，该项目从通用源读取数据，使用 swing 形成图像，然后将图像(一行图像)转换为 escpos 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 java-escpos-image-printing Material ，但略有改动:

            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“切纸命令”，应该在绘制第二条线后启动(物理上，打印机的切纸器和打印头之间有很大的空间)。

一切似乎都工作正常，但有时我会随机收到缺少的第二行(总是在 Papercut 命令之前)，有时缺少空格(第一行和第三行只是放在一起)，有时缺少空格。

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

<小时/>

将问题定位到零件

if (n == 2) { bos.write(printerSchema.getCutPaper()); } the line before it isnt drawn.

Answer 1

您可以使用escpos-coffee library并使用 feed 打印图像可以正常工作，如下所示:

            /*
             * 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);