Save Games / Player Prefs

Hey guys,
I was wondering if you could help me out, I'm having some problems with my saved game file (thank you Zumwalt from http://wiki.unity3d.com) on Windows Phone and I've been trying to find a solution for a few days and I'm stuck.

So, I get this error when I create a build:

Code (csharp):

1. Error building Player: Exception: Error: type `System.Xml.XmlTextWriter` doesn't exist in target framework.
2. Error: type `System.Xml.XmlTextWriter` doesn't exist in target framework.
3. Error: type `System.Xml.XmlTextWriter` doesn't exist in target framework.
4.  

I understand that its because its part of a library I can't use. Can anyone suggest an alternative to System.Xml.XmlTextWriter? I tried using StreamWriter but that didn't work. I've posted my full code below.

I've also tried using the Player Prefs code from here instead http://wiki.unity3d.com/index.php/PlayerSave to work around the xml problem, but I ran into problems too. When I deployed it to the phone it worked fine on first launch ie. i could exit to the menu, hit load game and it would call the saved game perfectly, but when I closed the app and reopened it, it seemed to have lost the data. Has anyone encountered this? I don't have a delete method anywhere. I can post the code to this too if needed.

Any help or a code sample of a fully working save game/player prefs solution for windows phone would be greatly appreciated. Thanks in advance

Code (csharp):

1. using UnityEngine;
2. using System;
3. using System.Collections;
4. using System.Xml;
5. using System.Xml.Serialization;
6. using System.IO;
7. using System.Text;
8.  
9. public class SavedGame: MonoBehaviour {
10.  
11.     public static string fileLocation,fileName, fileAndroid;
12.     UserData myData;
13.     string _data;
14.     public static int levelNumberRef;
15.    
16.     StreamWriter writer;
17.     int currentLevel;
18.     int currentDifficulty;
19.  
20.    void Start ()
21.     {  
22.         currentLevel = Application.loadedLevel;
23.         fileName="SaveGame.xml";
24.                 fileLocation= Application.persistentDataPath;
25.         fileAndroid = fileLocation + "/" + fileName;
26.         FileInfo fileExisting = new FileInfo(fileAndroid);
27.                 myData=new UserData();
28.        
29.         if(currentLevel > 3)
30.         {
31.             myData._iUser.levelNumber = currentLevel;
32.                     _data = SerializeObject(myData);
33.         CreateXML();
34.         Debug.Log(_data);
35.         Debug.Log(fileAndroid);
36.         }
37.  
38.         if (Application.loadedLevel == 0  fileExisting.Exists)
39.         {
40.             LoadXML();
41.             Debug.Log(fileAndroid);
42.             if(_data.ToString() != "")
43.             {
44.                 myData = (UserData)DeserializeObject(_data);
45.                 levelNumberRef = myData._iUser.levelNumber;
46.             }
47.         }
48.    }
49.  
50.    string UTF8ByteArrayToString(byte[] characters)
51.    {      
52.       UTF8Encoding encoding = new UTF8Encoding();
53.       string constructedString = encoding.GetString(characters);
54.       return (constructedString);
55.    }
56.  
57.    byte[] StringToUTF8ByteArray(string pXmlString)
58.    {
59.       UTF8Encoding encoding = new UTF8Encoding();
60.       byte[] byteArray = encoding.GetBytes(pXmlString);
61.       return byteArray;
62.    }
63.  
64.    string SerializeObject(object pObject)
65.    {
66.       string XmlizedString = null;
67.       MemoryStream memoryStream = new MemoryStream();
68.       XmlSerializer xs = new XmlSerializer(typeof(UserData));
69.       XmlTextWriter xmlTextWriter = new XmlTextWriter(memoryStream, Encoding.UTF8);
70.       xs.Serialize(xmlTextWriter, pObject);
71.       memoryStream = (MemoryStream)xmlTextWriter.BaseStream;
72.       XmlizedString = UTF8ByteArrayToString(memoryStream.ToArray());
73.       return XmlizedString;
74.    }
75.  
76.    object DeserializeObject(string pXmlizedString)
77.    {
78.       XmlSerializer xs = new XmlSerializer(typeof(UserData));
79.       MemoryStream memoryStream = new MemoryStream(StringToUTF8ByteArray(pXmlizedString));
80.       //XmlTextWriter xmlTextWriter = new XmlTextWriter(memoryStream, Encoding.UTF8);
81.       return xs.Deserialize(memoryStream);
82.    }
83.  
84.    void CreateXML()
85.    {
86.       writer = File.CreateText(fileAndroid);
87.       writer.Write(_data);
88.       writer.Close();
89.       Debug.Log("File written.");
90.    }
91.  
92.    void LoadXML()
93.    {
94.       StreamReader r = File.OpenText(fileAndroid);
95.       string _info = r.ReadToEnd();
96.       r.Close();
97.       _data=_info;
98.       Debug.Log("File Read");
99.    }
100. }
101.  
102.  public class UserData
103.  {
104.    public DemoData _iUser;
105.    public UserData() {}
106.    public struct DemoData
107.    {
108.       public int levelNumber;
109.    }
110. }

 

Found a solution and got it working. Thanks.

 

Sure, no problem.
I couldn't find a direct solution to the issues I mentioned above, so in the end I opted to just use Player Prefs (http://docs.unity3d.com/Documentation/ScriptReference/PlayerPrefs.html) which got rid of the problem of data being lost when I restarted the game.

I created this script and attached it to an object in all the scenes in my game:

Code (csharp):

1. using UnityEngine;
2. using System.Collections;
3. using System.IO;
4. using System;
5. using System.Collections.Generic;
6.  
7. public class Saver : MonoBehaviour
8. {
9.     public int levelNumber = 0;
10.     public int score = 0;
11.     public int difficultyLevel = 0;
12.  
13.     public static int levelCall;
14.     public static int scoreCall;
15.     public static int diffCall;
16.  
17.    
18.  public void Start()
19.     {
20. //Scenes 4 upwards automatically save data when started
21.         if(Application.loadedLevel > 3)
22.         {
23.             levelNumber = Application.loadedLevel;
24.             score = TurretScript.score;
25.             difficultyLevel = Difficulty.difficultyLevelSelected;
26.             PlayerPrefs.SetInt("levelSaver", levelNumber);
27.             PlayerPrefs.SetInt("scoreSaver", score);
28.             PlayerPrefs.SetInt("diffSaver", difficultyLevel);
29.             PlayerPrefs.Save();
30.         }
31.  
32. // On loading the first scene of my game the saved data is loaded to
33. //three variables (levelCall ,scoreCall ,diffCall )
34.         if(Application.loadedLevel == 0)
35.         {
36.             levelCall = PlayerPrefs.GetInt("levelSaver");
37.             scoreCall = PlayerPrefs.GetInt("scoreSaver");
38.             diffCall = PlayerPrefs.GetInt("diffSaver");
39.         }
40.     }  
41. }

So then in my menu options it loads the game with the saved data that I stored when the first scene was loaded.

Code (csharp):

1.  
2. if (GUI.Button(new Rect(buttonXPos, Screen.height/2.0f - Screen.height/4f, buttonWidth, buttonHeight),"Load Previous Game"))
3.             {
4.                 loadGame = true;
5.                 Application.LoadLevel(Saver.levelCall);
6.                 Game.score = Saver.scoreCall ;
7.                 Difficulty.difficultyLevelSelected = Saver.diffCall ;
8.             }
9.