qrcode-demo

gistfile1.txt

package main
import (
	//"bytes"
	qrcode "github.com/skip2/go-qrcode"
	"crypto/rand"
	"fmt"
	//"image"
	//"image/png"
	"os"
	"runtime"
)

func randStr(strSize int, randType string) string {

	var dictionary string

	if randType == "alphanum" {
		dictionary = "0123456789ABCDEFGHIJKLMNOPQRSTUVWXYZabcdefghijklmnopqrstuvwxyz"
	}

	if randType == "alpha" {
		dictionary = "ABCDEFGHIJKLMNOPQRSTUVWXYZabcdefghijklmnopqrstuvwxyz"
	}

	if randType == "number" {
		dictionary = "0123456789"
	}

	var bytes = make([]byte, strSize)
	rand.Read(bytes)
	for k, v := range bytes {
		bytes[k] = dictionary[v%byte(len(dictionary))]
	}
	return string(bytes)
}

func main() {

	// maximize CPU usage for maximum performance
	runtime.GOMAXPROCS(runtime.NumCPU())

	// generate a random string - preferably 6 or 8 characters
	randomStr := randStr(6, "alphanum")
	fmt.Println(randomStr)

	// generate the link or any data you want to
	// encode into QR codes
	// in this example, we use an example of making purchase by QR code.
	// Replace the stuff2buy with yours.

	stuff2buy := "stuffpurchaseby?userid=" + randomStr + "&issuer=SomeBigSuperMarket"

	PathExists("./QRPNG/")
	pngName := "./QRPNG/QRImg_" + randomStr + ".png"

	// https://github.com/skip2/go-qrcode
	err := qrcode.WriteFile(stuff2buy, qrcode.Medium, 256, pngName)

	if err != nil {
		fmt.Println(err)
		os.Exit(1)
	}
	// everything ok
	fmt.Println("QR code generated and saved to " + pngName)

}

func PathExists(path string) (bool, error) {
	_, err := os.Stat(path)

	if err != nil && os.IsNotExist(err) {
		os.MkdirAll(path, 0777)
	}
	return true, nil
}

生成二维码