I'm working on a project, that reads the data from a generic source, formes an image using swing, than translates the image(a row of images) into escpos commands and sends it to the printer.
To transfer the image to escpos code i used java-escpos-image-printing material, but with a minor alteration:
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++;
The alteration is a "cut-paper-command", that should init after the second line is drawn(physically, the printer has a large space between the cutter and the printer head).
All seem to be working fine, but sometimes i randomly recieve a missing second line(always before the cut paper command), sometimes with missing space(the first and third line just get together), and sometimes with a white space.
The printer: Sam4s Giant-100 Commands:
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
Localized the problem to the part
if (n == 2) { bos.write(printerSchema.getCutPaper()); } the line before it isnt drawn.
You can use escpos-coffee library and print image with feed will works fine like this:
/*
* 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);