unity 文件、图片加载与保存

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using UnityEngine;

02.using System.Collections;

03.using System.IO;

04.

05.public class AsyncImageDownload :MonoBehaviour {

06.

07.public  Texture placeholder;

08.public static AsyncImageDownload  Instance=null;

09.

10.private   string path=Application.persistentDataPath+"/ImageCache/" ;

11.

12.//构建单例

13.public static AsyncImageDownload CreateSingleton()

14.{

15.if (!Directory.Exists(Application.persistentDataPath+"/ImageCache/")) {

16.Directory.CreateDirectory(Application.persistentDataPath+"/ImageCache/");

17.}

18.

19.GameObject obj = new GameObject ();

20.obj.AddComponent<AsyncImageDownload> ();

21.

22.AsyncImageDownload loader= obj.GetComponent<AsyncImageDownload>();

23.Instance=loader;

24.loader.placeholder=Resources.Load("placeholder") as Texture;

25.return loader;

26.

27.}

28.

29.

30.public  void SetAsyncImage(string url,UITexture texture){

31.

32.

33.

34.//开始下载图片前，将UITexture的主图片设置为占位图

35.texture.mainTexture = placeholder;

36.

37.//判断是否是第一次加载这张图片

38.

39.if (!File.Exists (path + url.GetHashCode())) {

40.//如果之前不存在缓存文件

41.

42.

43.StartCoroutine (DownloadImage (url, texture));

44.

45.

46.}

47.else {

48.

49.StartCoroutine(LoadLocalImage(url,texture));

50.

51.}

52.

53.}

54.

55.IEnumerator  DownloadImage(string url,UITexture texture){

56.Debug.Log("downloading new image:"+path+url.GetHashCode());

57.WWW www = new WWW (url);

58.yield return www;

59.

60.Texture2D image = www.texture;

61.//将图片保存至缓存路径

62.byte[] pngData = image.EncodeToPNG(); 

63.File.WriteAllBytes(path+url.GetHashCode(), pngData); 

64.

65.texture.mainTexture = image;

66.

67.}

68.

69.IEnumerator  LoadLocalImage(string url,UITexture texture){

70.string filePath = "file:///" + path + url.GetHashCode ();

71.

72.Debug.Log("getting local image:"+filePath);

73.WWW www = new WWW (filePath);

74.yield return www;

75.

76.

77.//直接贴图

78.texture.mainTexture = www.texture;

79.

80.}

81.}

1.最近我也碰到过这个问题，我是这样解决的。

1.将文件下载完成
2.通过URL获取文件名字（类型包括在里面了）
3.通过字节的形式，以写文件的方式写到本地。
直接上代码：
   private IEnumerator DownLoadToLocal(string url, string number)
   {
   WWW www = new WWW(url);
   string img_name = url.Substring(url.LastIndexOf('/') + 1); //根据URL获取文件的名字。
   yield return www;
   if (www.error == null)
   {
   FileStream fs = File.Create(path + img_name); //path为你想保存文件的路径。
   fs.Write(www.bytes, 0, www.bytes.Length);
   fs.Close();
   }
   else
   {
   Debug.Log(www.error);
   }

   }

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