About escpos

This is a simple Go 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.

Installation

Install the package via the following:

go get -u github.com/cloudinn/escpos

Example epos-server

An example EPOS server implementation is available in the cmd/epos-server subdirectory of this project. This example server is more or less compatible with Epson TM-Intelligent printers and print server implementations.

Usage

The escpos package can be used similarly to the following:

package main

import (
    "bufio"
    "os"

    "github.com/cloudinn/escpos"
)

func main() {
    f, err := os.Open("/dev/usb/lp0")
    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()
}

NOTE

The Imported font inside the code is a system font called DejaVuSansMono-Bold.ttfsoyou shoukd make sure it exists in the system and it'splaced in the "/usr/share/fonts/truetype/dejavu/"

TODO

• Fix barcode support

Credits

• Repo forked from kenshaw escpos
• Some of the work in this repo is based on python-escpos and escpos-php packages