This is a simple Golang package that provides ESC-POS library functions to help with sending control codes to a ESC-POS capable printer such as an Epson TM-T82 or similar.
These printers are often used in retail environments in conjunction with a point-of-sale (POS) system.
Install the package via the following:
go get -u github.com/knq/escpos
An example EPOS server implementation is available in the epos-server subdirectory of this project. This example server is more or less compatible with Epson TM-Intelligent printers and print server implementations.
The escpos package can be used similarly to the following:
package main
import (
"bufio"
"os"
"github.com/knq/escpos"
)
func main() {
f, err := os.OpenFile("/dev/usb/lp3", os.O_RDWR, 0)
if err != nil {
panic(err)
}
defer f.Close()
w := bufio.NewWriter(f)
p := escpos.New(w)
p.Init()
p.SetSmooth(1)
p.SetFontSize(2, 3)
p.SetFont("A")
p.Write("test ")
p.SetFont("B")
p.Write("test2 ")
p.SetFont("C")
p.Write("test3 ")
p.Formfeed()
p.SetFont("B")
p.SetFontSize(1, 1)
p.SetEmphasize(1)
p.Write("halle")
p.Formfeed()
p.SetUnderline(1)
p.SetFontSize(4, 4)
p.Write("halle")
p.SetReverse(1)
p.SetFontSize(2, 4)
p.Write("halle")
p.Formfeed()
p.SetFont("C")
p.SetFontSize(8, 8)
p.Write("halle")
p.FormfeedN(5)
p.Cut()
p.End()
w.Flush()
}- Fix barcode/image support
- Update code to be idiomatic Go
- Fix example server implementation