Month: September 2020

It’s been a while since my last post. These days, I have been busy with our Unity project to integrate Unity3D graphic engine into our software eco system. An interesting sub-task is to implement a QR code scanner in our Unity project.

The ZXing.Net library did a wonderful job for me. You can download from nuget or github.

using System.Collections;
using System.Collections.Generic;
using System.Net;
using UnityEngine;
using UnityEngine.UI;
using ZXing;

public class QRScanner : MonoBehaviour
{
    WebCamTexture webcamTexture;
    string QrCode = string.Empty;
    public AudioSource beepSound;

    void Start()
    {
        var renderer = GetComponent<RawImage>();
        webcamTexture = new WebCamTexture(512, 512);
        renderer.material.mainTexture = webcamTexture;
        StartCoroutine(GetQRCode());
    }

    IEnumerator GetQRCode()
    {
        IBarcodeReader barCodeReader = new BarcodeReader();
        webcamTexture.Play();
        var snap = new Texture2D(webcamTexture.width, webcamTexture.height, TextureFormat.ARGB32, false);
        while (string.IsNullOrEmpty(QrCode))
        {
            try
            {
                snap.SetPixels32(webcamTexture.GetPixels32());
                var Result= barCodeReader.Decode(snap.GetRawTextureData(), webcamTexture.width, webcamTexture.height, RGBLuminanceSource.BitmapFormat.ARGB32);
                if (Result!= null)
                {
                    QrCode = Result.Text;
                    if (!string.IsNullOrEmpty(QrCode))
                    {
                         Debug.Log("DECODED TEXT FROM QR: " + QrCode);
                        break;
                    }
                }
            }
            catch (Exception ex) { Debug.LogWarning(ex.Message); }
            yield return null;
        }
        webcamTexture.Stop();
    }
}

I was using Unity 2019 LTS to experiment with this.

The whole project can be found at https://github.com/nickdu088/unityqrscanner