1、下载zxing.unity.dll

https://github.com/micjahn/ZXing.Net/releases/
在unity目录下找到zxing.unity.dll

[百度网盘] ZXing.Net.0.16.8.0.zip 提取码: fl91

也可以从这里直接下载 zxing.unity.dll

2、新建Unity工程

将zxing.unity.dll放到Unity工程下的Assets/Plugins目录下

测试

发布到Hololens设备上进行测试。
可以使用草料二维码生成器生成测试二维码。

辅助类

using System;
using System.Collections;
using UnityEngine;
using UnityEngine.UI;
using UnityEngine.Events;
using UnityEngine.Serialization;
using ZXing;
/// <summary>
/// 扫描二维码辅助类
/// 基于 zxing.unity.dll
/// </summary>
public class QRCodeHelper : MonoBehaviour
{
    //相机捕捉到的图像
    private WebCamTexture webCameraTexture;
    //ZXing中的类，可读取二维码的内容
    private BarcodeReader barcodeReader;
    //计时，0.5s扫描一次
    private float scanInterval = 0.5f;
    //存放摄像头画面数据
    private Color32[] data;
    //显示摄像头画面
    public RawImage cameraTexture;
    //显示二维码信息
    public Text QRCodeText;
    //是否正在扫描
    private bool scaning;

    //定义未找到设备相机事件
    [Serializable]
    public class NoCameraErrorEvent : UnityEvent { }
    [FormerlySerializedAs("NoCameraError")]
    [SerializeField]
    private NoCameraErrorEvent m_NoCameraError = new NoCameraErrorEvent();
    //定义扫码成功事件
    public Action<string> OnCompleted;

    //开始扫描二维码
    public void StartScanQRCode()
    {
        StartCoroutine(RequestWebCamAuthorization());
    }

   
    //请求相机权限
    IEnumerator RequestWebCamAuthorization()
    {
        barcodeReader = new BarcodeReader();
        yield return Application.RequestUserAuthorization(UserAuthorization.WebCam);//请求授权使用摄像头
        if (Application.HasUserAuthorization(UserAuthorization.WebCam))
        {
            WebCamDevice[] devices = WebCamTexture.devices;//获取摄像头设备
            if (devices.Length == 0)
            {
                Debug.LogError("device no camera available");
                m_NoCameraError.Invoke();
                yield break;
            }
            string devicename = devices[0].name;
            webCameraTexture = new WebCamTexture(devicename, 400, 300);//获取摄像头捕捉到的画面

            if (cameraTexture != null)
            {
                cameraTexture.enabled = true;
                cameraTexture.texture = webCameraTexture;
            }

            webCameraTexture.Play();
            
            StartCoroutine(ScanQRCode());
        }
    }

    //扫描二维码
    private IEnumerator ScanQRCode()
    {
        scaning = true;
        while (true)
        {
            data = webCameraTexture.GetPixels32();//相机捕捉到的纹理
            DecodeQR(webCameraTexture.width, webCameraTexture.height);
            yield return new WaitForSeconds(scanInterval);

            if (!scaning)
                break;
        }
    }

    /// <summary>
    /// 识别二维码并显示其中包含的文字、URL等信息
    /// </summary>
    /// <param name="width">相机捕捉到的纹理的宽度</param>
    /// <param name="height">相机捕捉到的纹理的高度</param>
    private void DecodeQR(int width, int height)
    {
        var br = barcodeReader.Decode(data, width, height);
        if (br != null)
        {
            //Debug.LogFormat("QR Code: {0}", br.Text);
            if (QRCodeText != null)
                QRCodeText.text = br.Text;
            Stop();
            OnCompleted?.Invoke(br.Text);
        }
        else
        {
            if (QRCodeText != null)
                QRCodeText.text = "";
        }
    }

    //停止扫描
    public void Stop()
    {
        scaning = false;
    }
} 

官方提供的扫描二维码方案：Microsoft.MixedReality.QR