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main.go
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main.go
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package main
import (
"flag"
"image"
"log"
"os"
_ "image/gif"
_ "image/jpeg"
_ "image/png"
"github.com/knq/escpos"
"github.com/knq/escpos/raster"
)
var (
lpDev = flag.String("p", "/dev/usb/lp0", "Printer dev file")
imgPath = flag.String("i", "image.png", "Input image")
threshold = flag.Float64("t", 0.5, "Black/white threshold")
align = flag.String("a", "center", "Alignment (left, center, right)")
doCut = flag.Bool("c", false, "Cut after print")
maxWidth = flag.Int("printer-max-width", 512, "Printer max width in pixels")
)
func main() {
flag.Parse()
imgFile, err := os.Open(*imgPath)
if err != nil {
log.Fatal(err)
}
img, imgFormat, err := image.Decode(imgFile)
imgFile.Close()
if err != nil {
log.Fatal(err)
}
log.Print("Loaded image, format: ", imgFormat)
// ----------------------------------------------------------------------
f, err := os.OpenFile(*lpDev, os.O_RDWR, 0)
if err != nil {
log.Fatal(err)
}
defer f.Close()
log.Print(*lpDev, " open.")
ep := escpos.New(f)
ep.Init()
ep.SetAlign(*align)
rasterConv := &raster.Converter{
MaxWidth: *maxWidth,
Threshold: *threshold,
}
rasterConv.Print(img, ep)
if *doCut {
ep.Cut()
}
ep.End()
}