using System;
using System.Collections;
using System.Collections.Generic;
using UnityEngine;
using UnityEngine.UI;
using System.IO;public class readPictures : MonoBehaviour
{private Image image;private string loadpath = "D:/SOmeOther/NGUI/Assets/StreamingAssets/test.jpg"; //IO方式加载的路径private string picpathWWW = "test.jpg"; //WWW的加载方式路径// Use this for initializationprivate void Start(){image = GetComponent<Image>();//IO方法加载速度快
//        LoadByIO();//WWW 加载速度慢
        LoadByWWW();}private void LoadByIO(){double startTime = (double) Time.time;//创建文件流FileStream fileStream = new FileStream(loadpath, FileMode.Open, FileAccess.Read);fileStream.Seek(0, SeekOrigin.Begin);//创建文件长度的缓冲区byte[] bytes = new byte[fileStream.Length];//读取文件fileStream.Read(bytes, 0, (int) fileStream.Length);//释放文件读取liu
        fileStream.Close();fileStream.Dispose();fileStream = null;//创建Textureint width = 300;int height = 372;Texture2D texture2D = new Texture2D(width, height);texture2D.LoadImage(bytes);Sprite sprite = Sprite.Create(texture2D, new Rect(0, 0, texture2D.width, texture2D.height),new Vector2(0.5f, 0.5f));image.sprite = sprite;double time = (double) Time.time - startTime;Debug.Log("IO加载用时：" + time);}private void LoadByWWW(){StartCoroutine(Load());}private string url = "file://D:/SOmeOther/NGUI/Assets/StreamingAssets/";
//    private string url = "https://timgsa.baidu.com/timg?image&quality=80&size=b9999_10000&sec=1502532130856&di=7135149ed906483861efdfc9770def3b&imgtype=0&src=http%3A%2F%2Fwww.newasp.net%2Fattachment%2Fsoft%2F2017%2F0811%2F144057_83971519.png"; 这里当然可以换做网络图片的URL 就加载网络图片了private IEnumerator Load(){double startTime = (double) Time.time;WWW www = new WWW(url + picpathWWW);//只能放URL
//        WWW www = new WWW(url);//只能放URL 这里可以换做网络的URLyield return www;if (www!=null && string.IsNullOrEmpty(www.error)){Texture2D texture = www.texture;//创建 SpriteSprite sprite = Sprite.Create(texture,new Rect(0,0,texture.width,texture.height),new Vector2(0.5f,0.5f) );image.sprite = sprite;double time = (double)Time.time - startTime;Debug.Log("WWW加载用时：" + time);}}}