qrcode generater with golang

qrgen.go

package main

import (
	"flag"
	"fmt"
	"image/png"
	"os"
	"time"

	"github.com/boombuler/barcode"
	"github.com/boombuler/barcode/qr"
)

func main() {

	var (
		s  string
		px int
	)
	flag.StringVar(&s, "s", "", "string to convert")
	flag.IntVar(&px, "px", 400, "size of qrcode")
	flag.Parse()

	qrCode, _ := qr.Encode(s, qr.M, qr.Auto)
	qrCode, _ = barcode.Scale(qrCode, px, px)
	fname := fmt.Sprintf("qrcode%v_%v.png", px, time.Now().Format("20060102150405"))

	fmt.Printf("converting to QR code '%v':\n'%v'\n", fname, s)

	file, _ := os.Create(fname)
	defer file.Close()
	png.Encode(file, qrCode)
}