Save and Load from XML【转】

Save and Load from XML

保存工程的信息：比如游戏进程中的位置信息，对抗双方的个人信息等：

方法1：使用xml文件：

 xml文件要以UTF-8的格式存储；

 但是这样做会使得programmer 可以从脚本中控制xml文件中的所有的字符，包括xml文件中的语法命令字符，因此会带来不安全隐患；

 附上两段代码：

 A 这一段是我自己写的，将一个xml文件按照字符串读入;

虽然unity3d中的string类型说明中讲到保存的是unicode characters，但是实际上当xml文件比较大的时候，如果保存成unicode，就读不出来，如果保存成UTF-8就不存在这个问题；

C#版本：

using UnityEngine;
using System.Collections;
using System.Xml;
using System.Xml.Serialization;
using System.IO;
using System.Text;
public class ReadXML: MonoBehaviour {

 //store the read in file
 WWW statusFile;

 //decide wether the reading of  xml has been finished
    bool isReadIn = false;
 // Use this for initialization
 IEnumerator Start () {//不能用void，否则没有办法使用yield
  isReadIn = false;
  yield return StartCoroutine(ReadIn());
  isReadIn = true;
 }

 IEnumerator ReadIn()
 {
  yield return statusFile = new WWW("file:///D:/unity/rotationAndcolor/Assets/information/testxml.xml");//注意路径的写法
 }

 // Update is called once per frame
 void Update () {
  if(isReadIn)
  {
   string statusData = statusFile.data;
   print(statusData.Length);
   }
 }

 //get the parameters in the xml file
 void getPatameters(string _xmlString)
 {
  //_xmlString.[0]
  }

 void postParameters()
 {

  }
}
public class _GameSaveLoad: MonoBehaviour {
   // An example where the encoding can be found is at
   // http://www.eggheadcafe.com/articles/system.xml.xmlserialization.asp
   // We will just use the KISS method and cheat a little and use
   // the examples from the web page since they are fully described

   // This is our local private members
   Rect _Save, _Load, _SaveMSG, _LoadMSG;
   bool _ShouldSave, _ShouldLoad,_SwitchSave,_SwitchLoad;
   string _FileLocation,_FileName;
   public GameObject _Player;
   UserData myData;
   string _PlayerName;
   string _data;

   Vector3 VPosition;

   // When the EGO is instansiated the Start will trigger
   // so we setup our initial values for our local members
   void Start () {
      // We setup our rectangles for our messages
      _Save=new Rect(10,80,100,20);
      _Load=new Rect(10,100,100,20);
      _SaveMSG=new Rect(10,120,400,40);
      _LoadMSG=new Rect(10,140,400,40);

      // Where we want to save and load to and from
      _FileLocation=Application.dataPath;
      _FileName="SaveData.xml";

      // for now, lets just set the name to Joe Schmoe
      _PlayerName = "Joe Schmoe";

      // we need soemthing to store the information into
      myData=new UserData();
   }

   void Update () {}

   void OnGUI()
   {

   //***************************************************
   // Loading The Player...
   // **************************************************
   if (GUI.Button(_Load,"Load")) {

      GUI.Label(_LoadMSG,"Loading from: "+_FileLocation);
      // Load our UserData into myData
      LoadXML();
      if(_data.ToString() != "")
      {
        // notice how I use a reference to type (UserData) here, you need this
        // so that the returned object is converted into the correct type
        myData = (UserData)DeserializeObject(_data);
        // set the players position to the data we loaded
        VPosition=new Vector3(myData._iUser.x,myData._iUser.y,myData._iUser.z);
        _Player.transform.position=VPosition;
        // just a way to show that we loaded in ok
        Debug.Log(myData._iUser.name);
      }

   }

   //***************************************************
   // Saving The Player...
   // **************************************************
   if (GUI.Button(_Save,"Save")) {

     GUI.Label(_SaveMSG,"Saving to: "+_FileLocation);
     myData._iUser.x=_Player.transform.position.x;
     myData._iUser.y=_Player.transform.position.y;
     myData._iUser.z=_Player.transform.position.z;
     myData._iUser.name=_PlayerName;

     // Time to creat our XML!
     _data = SerializeObject(myData);
     // This is the final resulting XML from the serialization process
     CreateXML();
     Debug.Log(_data);
   }


   }

   /* The following metods came from the referenced URL */
   string UTF8ByteArrayToString(byte[] characters)
   {
      UTF8Encoding encoding = new UTF8Encoding();
      string constructedString = encoding.GetString(characters);
      return (constructedString);
   }

   byte[] StringToUTF8ByteArray(string pXmlString)
   {
      UTF8Encoding encoding = new UTF8Encoding();
      byte[] byteArray = encoding.GetBytes(pXmlString);
      return byteArray;
   }

   // Here we serialize our UserData object of myData
   string SerializeObject(object pObject)
   {
      string XmlizedString = null;
      MemoryStream memoryStream = new MemoryStream();
      XmlSerializer xs = new XmlSerializer(typeof(UserData));
      XmlTextWriter xmlTextWriter = new XmlTextWriter(memoryStream, Encoding.UTF8);
      xs.Serialize(xmlTextWriter, pObject);
      memoryStream = (MemoryStream)xmlTextWriter.BaseStream;
      XmlizedString = UTF8ByteArrayToString(memoryStream.ToArray());
      return XmlizedString;
   }

   // Here we deserialize it back into its original form
   object DeserializeObject(string pXmlizedString)
   {
      XmlSerializer xs = new XmlSerializer(typeof(UserData));
      MemoryStream memoryStream = new MemoryStream(StringToUTF8ByteArray(pXmlizedString));
      XmlTextWriter xmlTextWriter = new XmlTextWriter(memoryStream, Encoding.UTF8);
      return xs.Deserialize(memoryStream);
   }

   // Finally our save and load methods for the file itself
   void CreateXML()
   {
      StreamWriter writer;
      FileInfo t = new FileInfo(_FileLocation+"//"+ _FileName);
      if(!t.Exists)
      {
         writer = t.CreateText();
      }
      else
      {
         t.Delete();
         writer = t.CreateText();
      }
      writer.Write(_data);
      writer.Close();
      Debug.Log("File written.");
   }

   void LoadXML()
   {
      StreamReader r = File.OpenText(_FileLocation+"//"+ _FileName);
      string _info = r.ReadToEnd();
      r.Close();
      _data=_info;
      Debug.Log("File Read");
   }
}
// UserData is our custom class that holds our defined objects we want to store in XML format
 public class UserData
 {
    // We have to define a default instance of the structure
   public DemoData _iUser;
    // Default constructor doesn't really do anything at the moment
   public UserData() { }

   // Anything we want to store in the XML file, we define it here
   public struct DemoData
   {
      public float x;
      public float y;
      public float z;
      public string name;
   }
}