uniapp截图保存为啥截图不了二维码

Posted 2023-05-11

因为这个二维码是通过canvas画出来的,在测试中发现,ios中可以被保存到相册,在安卓中就是,页面中的其他内容都被截图下来了,但是二维码不行 参考技术A 今天用uniapp写小程序二维码并保存到本地，网上的完全没有用，最后自己写了一个， 1.使用weapp.qrcode生成二维码，并使用uni.canvasToTempFilePath生成临时图片文件， 2.使用canvas绘制二维码， 3.使用uni.canvasToTempFilePath生成图片文件，然后uni.saveImageToPhotosAlbum保存到本地

二维码生成二维码识别生成对应小鱼模型摄像图截图保存本地读取本地图片替换模型贴图裁剪

Plugins文件夹里放这三个

using System.IO;
/// <summary>
/// 保存替换贴图
/// </summary>
public class CameraTextureSave : MonoBehaviour

   public static void SaveOne(WebCamTexture t,int frame,int w,int h)
    
        Texture2D t2d= new Texture2D(w, h, TextureFormat.ARGB32, true);
        Vector2 offset = new Vector2((t.width - w) / 2, (t.height - h) / 2);
        t2d.SetPixels(t.GetPixels((int)offset.x, (int)offset.y, w, h));
        t2d.Apply();
        //编码
        byte[] imageTytes=t2d.EncodeToJPG();
        //存储
        File.WriteAllBytes(@"Assets\\Resources\\myTexture1.jpg", imageTytes);
    
    public static void SaveTwo(WebCamTexture t,int frame,int w=850,int h=550)
    
        Texture2D texture=new Texture2D(w,h, TextureFormat.ARGB32,true);
        Vector2 offset=new Vector2((t.width-w)/2,(t.height-h)/2);        
        texture.SetPixels(t.GetPixels((int)offset.x,(int)offset.y,w,h));
        texture.Apply();
        byte[] imageTytes = texture.EncodeToJPG();
        File.WriteAllBytes(@"Assets\\Resources\\myTexture2.jpg", imageTytes);
    

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

/// <summary>
/// 二维码扫描识别功能
/// </summary>
public class TestQRCodeScanning : MonoBehaviour

    [Header("摄像机检测界面")]
    public RawImage cameraTexture; //摄像机映射显示区域

    private WebCamTexture webCamTexture;//摄像机映射纹理

    //public Text text;   //用来显示扫描的信息
    public int framecount = 0;
    public int framecount1 = 0;
    BarcodeReader barcodeReader;    //库文件的对象（二维码信息保存的地方）

    public int CameraRequestedWidth = 1024;
    public int CameraRequestedHeight = 1024;

    /// <summary>
    /// 开启摄像机和准备工作
    /// </summary>
    void  DeviceInit()
    
        //yield return Application.RequestUserAuthorization(UserAuthorization.WebCam);
        //if (Application.HasUserAuthorization(UserAuthorization.WebCam))
        //

            WebCamDevice[] devices = WebCamTexture.devices;//1.获取所有摄像机硬件
            string deviceName = devices[0].name;    //2.获取第一个摄像机硬件的名称
            webCamTexture = new WebCamTexture(deviceName, 1024, 1024); //3.创建实例化一个摄像机显示区域
            cameraTexture.texture = webCamTexture;  //4.显示图片信息
            //webCamTexture.width = 1024;
            //webCamTexture.height = 1024;
            CameraRequestedWidth = webCamTexture.requestedWidth;
            CameraRequestedHeight = webCamTexture.requestedHeight;
            
            webCamTexture.Play();   //5.打开摄像机运行识别

            barcodeReader = new BarcodeReader(); //6.实例化识别二维码信息
        //


    


    Color32[] data; //二维码图片信息以像素点颜色信息数组存放
    /// <summary>
    /// 识别摄像机图片中的二维码信息
    /// </summary>
    void ScanQRCode()
    
        data = webCamTexture.GetPixels32(); //7.获取摄像机画面像素颜色的数组信息
        Result result=barcodeReader.Decode(data,webCamTexture.width,webCamTexture.height);//8.获取图片中的二维码信息
        //如果获取到二维码信息了，打印出来
        if (result!=null)
        
            Debug.Log(result.Text);//从二维码识别出来的信息
            if (result.Text== "二维码")
            
                CameraTextureSave.SaveOne(webCamTexture, framecount,850,550);
                FishOneCreate();
                framecount++;
            
            else if (result.Text == "第一个")
            
                CameraTextureSave.SaveTwo(webCamTexture, framecount1);
                FishTwoCreate();
                framecount1++;
            
            //扫描成功后的处理：停止识别关闭相机
            //IsScanning = false;
            //webCamTexture.Stop();
        
    
 
    /// <summary>
    /// Start初始化函数
    /// </summary>
    private void Start()
    
        //scanningButton.onClick.AddListener(ScanningButtonClick);
        DeviceInit();
        //DeviceInit();
        IsScanning = true;
    

    bool IsScanning = false;
    float interval = 5; //扫描识别时间间隔
    [SerializeField]
    Button scanningButton;
    void ScanningButtonClick()
    
        //DeviceInit();
        //IsScanning = true;
    
    private void Update()
    
        if (IsScanning)
        
            //每隔一段时间进行一次识别二维码信息
            interval += Time.deltaTime;
            if (interval>=5)
            
                interval = 0;
                ScanQRCode();//开始扫描
            
        
    
    public void FishOneCreate()
    
        float x = Random.Range(-3.0f, 0);
        float y = Random.Range(-3.0f, 0);
        float z = Random.Range(-3.0f, 0);
        Vector3 pos = new Vector3(x, y, z);
        GameObject obj = Resources.Load<GameObject>("yu_1");
        //读取写入本地的图片并指定
        //Texture mTexture = Resources.Load("myTexture", typeof(Texture)) as Texture;
        byte[] imgData = File.ReadAllBytes(@"Assets\\Resources\\myTexture1.jpg");
        Texture mTexture = ByteToTex2d(imgData);
        //mTexture.LoadImage(imgData);
        GameObject a = Instantiate(obj, pos, Quaternion.identity);
        a.transform.Find("yu_1").GetComponent<Renderer>().material.mainTexture = mTexture;
    
    public void FishTwoCreate()
    
        float x = Random.Range(-3.0f, 0);
        float y = Random.Range(-3.0f, 0);
        float z = Random.Range(-3.0f, 0);
        Vector3 pos = new Vector3(x, y, z);
        GameObject obj = Resources.Load<GameObject>("yu_2");
        //读取写入本地的图片并指定
        //Texture mTexture = Resources.Load("myTexture", typeof(Texture)) as Texture;
        byte[] imgData = File.ReadAllBytes(@"Assets\\Resources\\myTexture2.jpg");
        Texture mTexture = ByteToTex2d(imgData);
        //mTexture.LoadImage(imgData);
        GameObject a = Instantiate(obj, pos, Quaternion.identity);
        a.transform.Find("yu_2").GetComponent<Renderer>().material.mainTexture = mTexture;
    
    public static Texture2D ByteToTex2d(byte[] bytes, int w = 1024, int h = 1024)
    
        Texture2D tex = new Texture2D(w, h);
        tex.LoadImage(bytes);
        return tex;
    

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

//二维码的生成

public class TestQRCodeDraw : MonoBehaviour

    [Header("绘制好的二维码显示界面")]
    public RawImage QRCode;
    //二维码绘制类
    BarcodeWriter barcodeWriter;
    [SerializeField]
    Button drawbutton;//先生成俩二维码测试用，截图保存下来


    /// <summary>
    /// 将制定字符串信息转换成二维码图片信息
    /// </summary>
    /// <param name="formatStr">要生产二维码的字符串信息</param>
    /// <param name="width">二维码的宽度</param>
    /// <param name="height">二维码的高度</param>
    /// <returns>返回二维码图片的颜色数组信息</returns>
    Color32[] GeneQRCode(string formatStr, int width, int height)
    
        QrCodeEncodingOptions options = new QrCodeEncodingOptions();//绘制二维码之前进行一些设置
        options.CharacterSet = "UTF-8"; //设置字符串转换格式，确保字符串信息保持正确
        options.Width= width;   //设置绘制区域的宽度和高度的像素值
        options.Height= height;
        options.Margin = 1; //设置二维码边缘留白宽度（值越大留白宽度越大，二维码就越小）

        barcodeWriter=new BarcodeWriter  Format = BarcodeFormat.QR_CODE,Options = options;//实例化字符串绘制二维码工具
        return barcodeWriter.Write(formatStr);//进行二维码绘制并进行返回图片的颜色数组信息
    


    /// <summary>
    /// 根据二维码图片信息绘制指定字符串信息的二维码到指定区域
    /// </summary>
    /// <param name="str">要产生二维码字符串信息</param>
    /// <param name="width">二维码的宽度</param>
    /// <param name="height">二维码的高度</param>
    /// <returns>返回绘制好的图片</returns>
    Texture2D showQRCode(string str,int width,int height)
    
        Texture2D t=new Texture2D(width,height);//实例化一个图片类
        Color32[] col32=GeneQRCode(str,width,height);//获取二维码图片颜色数组信息
        t.SetPixels32(col32);//为图片设置绘制像素颜色信息
        t.Apply();//设置信息更新应用下
        return t;//将整理好的图片信息指定到指定区域中
    

    /// <summary>
    /// 开始绘制指定信息的二维码
    /// </summary>
    /// <param name="formatStr"></param>
    void DrawQRCode(string formatStr)
    
        Texture2D t=showQRCode(formatStr,256,256);//注意：这个宽高度大小256不要变。
        QRCode .texture = t;//显示到UI界面的图片上

    
    public string QRCodeText = "二维码";
    void DrawButtonClick()
    
        DrawQRCode(QRCodeText);
    
    private void Start()
    
        drawbutton.onClick.AddListener(DrawButtonClick);