Unity3D-下载资源至本地缓存

来源：互联网发布：linux下不保存退出编辑：程序博客网时间：2024/06/10 00:39
本示例使用BestHTTP插件请求url地址下载至本地，并做缓存管理，易于扩展
using System;using UnityEngine;using BestHTTP;using System.IO;using System.Security.Cryptography;public class DownloadCachesMgr : Singleton<DownloadCachesMgr>{    public string AssetCachesDir    {        get        {            string dir = "";#if UNITY_EDITOR            dir = Application.dataPath + "Caches/";//路径：/AssetsCaches/#elif UNITY_IOS            dir = Application.temporaryCachePath + "/Download/";//路径：Application/xxxxxxxx-xxxx-xxxx-xxxx-xxxxxxxxxxxx/Library/Caches/#elif UNITY_ANDROID            dir = Application.persistentDataPath + "/Download/";//路径：/data/data/xxx.xxx.xxx/files/#else            dir = Application.streamingAssetsPath + "/Download/";//路径：/xxx_Data/StreamingAssets/#endif            return dir;        }    }    public string ImagePathName { get { return AssetCachesDir + "Image/"; } }    public string TextPathName { get { return AssetCachesDir + "Config/"; } }    private string GetFileName(string url)    {        string name = StrToMD5(url);        return name;    }    public static string StrToMD5(string str)    {        byte[] data = System.Text.Encoding.GetEncoding("GB2312").GetBytes(str);        MD5 md5 = new MD5CryptoServiceProvider();        byte[] OutBytes = md5.ComputeHash(data);        string OutString = "";        for (int i = 0; i < OutBytes.Length; i++)        {            OutString += OutBytes[i].ToString("x2");        }        // return OutString.ToUpper();        return OutString.ToLower();    }    private bool CheckFileExists(string path , string name)    {        if (!Directory.Exists(path))        {            Directory.CreateDirectory(path);        }        FileInfo t = new FileInfo(path + "//" + name);        if (!t.Exists)        {            return false;        }        else        {            return true;        }    }    private void CreateFile(string path, string name,byte[] bytes)    {        if (!Directory.Exists(path))        {            Directory.CreateDirectory(path);        }        FileStream fs;        FileInfo t = new FileInfo(path + "//" + name);        if (!t.Exists)        {            fs = t.Create();        }        else        {            t.Delete();            fs = t.Create();        }        fs.Write(bytes, 0, bytes.Length);        fs.Close();        fs.Dispose();    }    public void LoadImage(string url, Action<int, Texture2D> callBack)    {        string name = GetFileName(url);        if (CheckFileExists(ImagePathName,name))        {            var bytes = File.ReadAllBytes(ImagePathName + "//" + name);            Texture2D tex = new Texture2D(0,0);            tex.LoadImage(bytes);            callBack(0, tex);        }        else        {            new HTTPRequest(new Uri(url), (request, response) =>            {                if (request.State == HTTPRequestStates.Finished)                {                    int result = 0;                    Texture2D tex = null;                    if (response.IsSuccess)                    {                        byte[] bytes = response.Data;                        CreateFile(ImagePathName, name, bytes);                        tex = new Texture2D(0,0);                        tex.LoadImage(bytes);                        callBack(result, tex);                    }                    else                    {                        result = response.StatusCode;                    }                    if (callBack != null)                    {                        callBack(result, tex);                    }                }            }).Send();        }    }}
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