【unity】ローカルデータストレージ

using UnityEngine;
using System.Collections;
// 
public class PathKit
{
    /**   */
    public const string SUFFIX = ".txt";
    const string PREFIX="file://";
    const string FORMAT=".unity3d";    
    public static string RESROOT=Application.persistentDataPath+"/";
    public static string GetStreamingAssetsPath (string p_filename)
    {
        string _strPath = "";
        if (Application.platform == RuntimePlatform.WindowsEditor || Application.platform == RuntimePlatform.WindowsPlayer )
            _strPath = "file://" + Application.streamingAssetsPath + "/" + p_filename + ".unity3d";
        else if (Application.platform == RuntimePlatform.Android )
            _strPath = Application.streamingAssetsPath + "/" + p_filename + ".unity3d";
        else if (  Application.platform == RuntimePlatform.OSXEditor ||  Application.platform == RuntimePlatform.IPhonePlayer)
            _strPath = "file://"+ Application.streamingAssetsPath + "/" + p_filename + ".unity3d";
        
        return _strPath;
    }    
   
    
    public static string GetOSDataPath (string p_filename)
    {
        string path;
        path = "";
        
        if (Application.platform == RuntimePlatform.OSXEditor)
            path = Application.persistentDataPath + p_filename;
        
        if (Application.platform == RuntimePlatform.IPhonePlayer)
            path = RESROOT + p_filename;
        
        
        if (Application.platform == RuntimePlatform.WindowsPlayer || Application.platform == RuntimePlatform.WindowsEditor)
            path = Application.dataPath +"/cache/"+ p_filename;    
        
        
        if (Application.platform == RuntimePlatform.Android)  
            path =RESROOT + p_filename;
    //    Debug.LogWarning("===========path:"+path);
        return path;
    }
    
        public static string GetURLPath (string p_filename,bool needPreFix,bool needFormat)
    {
        string path;
        path = "";
        
        if (Application.platform == RuntimePlatform.OSXEditor)
            path = Application.persistentDataPath+"/" + p_filename;
        
        if (Application.platform == RuntimePlatform.IPhonePlayer)
            path = RESROOT + p_filename;
        
        
        if (Application.platform == RuntimePlatform.WindowsEditor)
            path = Application.dataPath +"/cache/"+ p_filename;    
        
            if (Application.platform == RuntimePlatform.WindowsPlayer)
            path = Application.dataPath +"/cache/"+ p_filename;        
        
        if (Application.platform == RuntimePlatform.Android)  
            path = RESROOT + p_filename;
        if(needPreFix) path=PREFIX+path;
        if(needFormat) path=path+FORMAT;    
        //Debug.LogWarning("===========path:"+path);
        return path;
    }
    
    public static string getFileName(string path)
    {
        
    string[] _list=    path.Split(new char[]{'/'});
        
        
        
    if(_list.Length>0)    return _list[_list.Length-1];
        else
            return "";
        
    }
    
    public static string getFileDir(string path)
    {
        path = path.Replace("\\","/");
        path = path.Substring(0,path.LastIndexOf("/"));
        return path;
    }
    
    public static void CreateDirIfNotExists(string path)
    {
        string dir = getFileDir(path);
        if(!System.IO.Directory.Exists(dir))
        {
            System.IO.Directory.CreateDirectory(dir);
        }
    }
    
}

private void SaveFriendToLocal()

    {

        string cacheStr = "";// string path = PathKit.RESROOT + string.Format(CHAT_CACHE_DIR, UserId);

        FileStream fs = new FileStream(path, FileMode.OpenOrCreate, FileAccess.Write);

        StreamWriter sw = new StreamWriter(fs);

        sw.Flush();

        sw.BaseStream.Seek(0, SeekOrigin.Begin);

        sw.Write(cacheStr);

        sw.Close(); 

    }

private void LoadFriendFromLocal()

    {

        try

        {

            string path = PathKit.RESROOT + string.Format(CHAT_CACHE_DIR,UserId);

            if (!File.Exists(path)) return;

            FileStream fs = new FileStream(path, FileMode.OpenOrCreate, FileAccess.Read);

            byte[] bytes = new byte[fs.Length];

            fs.Read(bytes, 0, (int)fs.Length);

            fs.Close();

            mCacheFriend = new List<string> ();string[] arr = Encoding.UTF8.GetString (bytes).Split ('
');

            for (int i = 0; i < arr.Length; i++) {

                string[] item = arr[i].Split ('\t');

                mCacheFriend.Add (item[0]);

            }   

        }

        catch (System.Exception e)

        {

            Debug.Log(e.Message);

        }

    }