package main

import (
    "image/png"
    "os"
    "github.com/makiuchi-d/gozxing"
    "github.com/makiuchi-d/gozxing/oned"
    "fmt"
)

func encode(content, savePath string, width, height int) error {
    enc := oned.NewCode128Writer()
    img, err := enc.Encode(content, gozxing.BarcodeFormat_CODE_128, width, height, nil)
    if err != nil {
        return err
    }
    file, err := os.Create(savePath)
    if err != nil {
        return err
    }
    defer file.Close()
    return png.Encode(file, img)
}

func decode(file string) (content string, err error) {
    f, err := os.Open(file)
    if err != nil {
        return content, err
    }
    img, err := png.Decode(f)
    if err != nil {
        return content, err
    }
    dec := oned.NewCode128Reader()
    i, err := gozxing.NewBinaryBitmapFromImage(img)
    if err != nil {
        return content, err
    }
    r, err := dec.DecodeWithoutHints(i)
    if err != nil {
        return content, err
    }
    return r.String(), err
}

func main() {
    file := "barcode.png"
    if err := encode("barcode", file, 120, 60); err != nil {
        fmt.Println("encode error:", err)
        return
    }
    fmt.Println("encode success!")
    content, err := decode(file)
    if err != nil {
        fmt.Println("decode error:", err)
        return
    }
    fmt.Println(content)
}