Unity3D save ScreenShots by 3 methods

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/// <summary>      /// 使用Application类下的CaptureScreenshot()方法实现截图      /// 优点：简单，可以快速地截取某一帧的画面、全屏截图      /// 缺点：不能针对摄像机截图，无法进行局部截图      /// </summary>      /// <param name="mFileName">M file name.</param>      private void CaptureByUnity(string mFileName)      {          Application.CaptureScreenshot(mFileName,0);      }        /// <summary>      /// 根据一个Rect类型来截取指定范围的屏幕      /// 左下角为(0,0)      /// </summary>      /// <param name="mRect">M rect.</param>      /// <param name="mFileName">M file name.</param>      private IEnumerator CaptureByRect(Rect mRect,string mFileName)      {          //等待渲染线程结束          yield return new WaitForEndOfFrame();          //初始化Texture2D          Texture2D mTexture=new Texture2D((int)mRect.width,(int)mRect.height,TextureFormat.RGB24,false);          //读取屏幕像素信息并存储为纹理数据          mTexture.ReadPixels(mRect,0,0);          //应用          mTexture.Apply();                              //将图片信息编码为字节信息          byte[] bytes = mTexture.EncodeToPNG();            //保存          System.IO.File.WriteAllBytes(mFileName, bytes);                    //如果需要可以返回截图          //return mTexture;      }        private IEnumerator  CaptureByCamera(Camera mCamera,Rect mRect,string mFileName)      {          //等待渲染线程结束          yield return new WaitForEndOfFrame();            //初始化RenderTexture          RenderTexture mRender=new RenderTexture((int)mRect.width,(int)mRect.height,0);          //设置相机的渲染目标          mCamera.targetTexture=mRender;          //开始渲染          mCamera.Render();                    //激活渲染贴图读取信息          RenderTexture.active=mRender;                    Texture2D mTexture=new Texture2D((int)mRect.width,(int)mRect.height,TextureFormat.RGB24,false);          //读取屏幕像素信息并存储为纹理数据          mTexture.ReadPixels(mRect,0,0);          //应用          mTexture.Apply();                    //释放相机，销毁渲染贴图          mCamera.targetTexture = null;             RenderTexture.active = null;           GameObject.Destroy(mRender);                      //将图片信息编码为字节信息          byte[] bytes = mTexture.EncodeToPNG();            //保存          System.IO.File.WriteAllBytes(mFileName,bytes);                    //如果需要可以返回截图          //return mTexture;      }    }

//定义图片保存路径      private string mPath1;      private string mPath2;      private string mPath3;        //相机      public Transform CameraTrans;        void Start()      {          //初始化路径          mPath1=Application.dataPath+"\\ScreenShot\\ScreenShot1.png";          mPath2=Application.dataPath+"\\ScreenShot\\ScreenShot2.png";          mPath3=Application.dataPath+"\\ScreenShot\\ScreenShot3.png";      }        //主方法，使用UGUI实现      void OnGUI()      {          if(GUILayout.Button("截图方式1",GUILayout.Height(30))){              CaptureByUnity(mPath1);          }          if(GUILayout.Button("截图方式2",GUILayout.Height(30))){              StartCoroutine(CaptureByRect(new Rect(0,0,1024,768),mPath2));          }          if(GUILayout.Button("截图方式3",GUILayout.Height(30))){              //启用顶视图相机              CameraTrans.camera.enabled=true;              //禁用主相机              Camera.main.enabled=false;              StartCoroutine(CaptureByCamera(CameraTrans.camera,new Rect(0,0,1024,768),mPath3));          }      }

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