Unity3D图片的下载及保存

代码如下：

 using UnityEngine;
using System.Collections;
using System.IO;

public class DownPicture : MonoBehaviour {

    public GameObject plane;
    WWW www;
    string filePath;
    Texture2D test;
    Texture2D newTexture;
	// Use this for initialization
	void Start () {
        
        filePath = Application.dataPath + "/Resources/picture.jpg";
        
        if (System.IO.File.Exists(filePath))
        {
            Debug.Log("文件已存在");
            test = (Texture2D)Resources.Load("picture", typeof(Texture2D));
            plane.renderer.material.mainTexture = test;
        }
        else
        {
            Debug.Log("文件开始下载");
            StartCoroutine(GetImage());
            
        }
        
	}
	
	// Update is called once per frame
	void Update () 
    {
	    
	}

    IEnumerator GetImage()
    {
        string url = "http://192.168.2.105:8080/Test/picture/1.jpg";
       
        www = new WWW(url);
        yield return www;
        newTexture = www.texture;
        
        byte[] pngData = newTexture.EncodeToPNG();
        File.WriteAllBytes(filePath, pngData);
       
    }

    void OnGUI()
    {
       
        if (www.isDone)
            {
                plane.renderer.material.mainTexture = newTexture;

            }
    }
}