Unity调用摄像头并截图

首先界面是这样的,很简易

直接上代码

using System.IO;
using UnityEngine;

public class WebCamera : MonoBehaviour
{
    [Tooltip("返回的照片数据,根据返回的照片,进行照片的识别和比对认证等等!"), Space(5)]
    [Header("摄像头拍摄的照片"),]
    public WebCamTexture camTexture;//摄像头拍下的图片数据

    [Header("摄像头设备名")]
    private WebCamDevice[] devices;

    [Tooltip("USB摄像头设备"), Space(5)]
    [Header("摄像头设备名")]
    public string deviceName;//摄像头设备名称

    public bool isClick;//是否点击了按钮

    private void Start()
    {
        isClick = false;
    }
    //初始化摄像头显示的图像的大小
    private void Awake()
    {
        camTexture = new WebCamTexture(deviceName, 800, 600, 60);
    }

    //通过GUI绘制摄像头要显示的窗口
    private void OnGUI()
    {
        //首先根据摄像头展示的画面来判断摄像头是否存在
        if (isClick == true && camTexture != null)
        {
            //绘制画面(Screen.width / 2 - 150f, Screen.height / 2 - 290,这里是画面距离场景的高和宽的限制)
            //800, 600是和camTexture的画面一样大的绘制窗口
            GUI.DrawTexture(new Rect(0, 0, 800, 600), camTexture);
        }
        if (isClick == false && camTexture != null)//不显示画面(没写这个步骤之前有个坑)
        {
            GUI.DrawTexture(new Rect(Screen.width / 2 - 150f, Screen.height / 2 - 290, 0, 0), camTexture);
        }

    }

    //打开摄像机的方法//挂到button按钮上
    public void OpenWebCamDevice()
    {
        isClick = true;
        if (isClick == true)
        {
            //用户授权打开摄像头
            if (Application.HasUserAuthorization(UserAuthorization.WebCam))
            {
                devices = WebCamTexture.devices;//显示画面的设备就是要打开的摄像头
                deviceName = devices[0].name;//获取到设备名称
                camTexture.Play();//开启摄像头
            }
        }
    }

    //关闭摄像头//挂到button按钮上
    public void CloseWebCamDevice()
    {
        if (isClick == true && camTexture != null)
        {
            isClick = false;
        }
    }
}

截图脚本

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

public class JieTu : MonoBehaviour
{
    public RawImage RawImgLeft;
    public Image[] warningImgs;
    List<Texture2D> cacheTexture = new List<Texture2D>(); // 缓存图片
    readonly string savePath = Application.streamingAssetsPath + "/SavePng/"; // 图片保存路径
	// 此方法实现的是显示四个图片,多余四个的就后面排上将前面挤掉
    public void JieTuFunc(float temperature)
    {
        Texture2D jietuTexture = TextureToTexture2D(RawImgLeft.texture);
        if (this.cacheTexture.Count >= 4)
        {
            this.cacheTexture.RemoveAt(0);
        }
        save(jietuTexture, temperature);

        this.cacheTexture.Add(jietuTexture);

        for (int i = 0; i < this.cacheTexture.Count; i++)
        {
            warningImgs[i].sprite = Sprite.Create(this.cacheTexture[i], new Rect(0, 0, this.cacheTexture[i].width, this.cacheTexture[i].height), new Vector2(0.5f, 0.5f));
            warningImgs[i].rectTransform.sizeDelta = Vector3.one * 90;
        }
    }
    /// 

    /// 保存图片
    /// 
    /// 
    void save(Texture2D texture2D, float avg)
    {

        byte[] textureBytes = texture2D.EncodeToPNG();
        FileStream fs = File.Open(savePath + DateTime.Now.Year + "_" + DateTime.Now.Month + "_" + DateTime.Now.Day + "_" + DateTime.Now.Hour + "_" + DateTime.Now.Minute + "_" + DateTime.Now.Second + "_" + avg + "℃.png", FileMode.OpenOrCreate);
        fs.Write(textureBytes, 0, textureBytes.Length);
        fs.Flush();
        fs.Close();
    }
    /// 

    /// Texture转换成Texture2D
    /// 
    /// 
    /// 
    private Texture2D TextureToTexture2D(Texture texture)
    {
        Texture2D texture2D = new Texture2D(texture.width, texture.height, TextureFormat.RGBA32, false);
        RenderTexture currentRT = RenderTexture.active;
        RenderTexture renderTexture = RenderTexture.GetTemporary(texture.width, texture.height, 32);
        Graphics.Blit(texture, renderTexture);

        RenderTexture.active = renderTexture;
        texture2D.ReadPixels(new Rect(0, 0, renderTexture.width, renderTexture.height), 0, 0);
        texture2D.Apply();

        RenderTexture.active = currentRT;
        RenderTexture.ReleaseTemporary(renderTexture);

        return texture2D;
    }
}

需要注意的是,因为路径的问题,需要手动创建放置截图的文件夹 StreamingAssets/my

效果如图

截图