Data persistence failure

Unity Engine
1

i followed the data persistence tutorial on unity and created a save and load function for my game. However for some strange reason whenever i call these functions, it saves the script but only till the application is closed. when the game is opened after being saved, and after trying to reload the file on start up, it doesn’t reload it like it should, it acts as though it didn’t retrieve the file at all. what could be wrong?

persistence data code

using UnityEngine;
using System.Collections;
using UnityEngine.UI;
using System;
using System.Runtime.Serialization.Formatters.Binary;
using System.IO;

public class Persistent : MonoBehaviour
{

    public static Persistent persistent;

    public int[] HighScores;

    public int SquishCoins;

    public int Volume;

    public int Score;

    public bool isSwipe;

    public bool isSound;

    // Use this for initialization
    void Start()
    {
        if (persistent == null)
        {
            DontDestroyOnLoad(gameObject);
            persistent = this;
        }
        else if (persistent != this)
        {
            Destroy(gameObject);
        }
    }

    // Update is called once per frame
    void Update()
    {
        Score = ScoreTime.score.Score;
    }

    public void Savethis()
    {
        BinaryFormatter bf = new BinaryFormatter();
        FileStream file = File.Create(Application.persistentDataPath + "Playerdata");

        Playerspecs data1 = new Playerspecs();

        data1.HighScores = persistent.HighScores;
        data1.isSound = persistent.isSound;
        data1.isSwipe = persistent.isSwipe;
        data1.SquishCoins = persistent.SquishCoins;
        data1.Volume = persistent.Volume;
        data1.Score = persistent.Score;
        data1.Score = persistent.Score;


        bf.Serialize(file, data1);

        file.Close();
    }

    public void Loadthis()
    {
        if (File.Exists(Application.persistentDataPath + "Playerdata"))
        {
            BinaryFormatter bf = new BinaryFormatter();
            FileStream file = File.Open(Application.persistentDataPath + "Playerdata", FileMode.Open);
            Playerspecs data1 = (Playerspecs)bf.Deserialize(file);
            file.Close();

            persistent.HighScores = data1.HighScores;
            persistent.isSwipe = data1.isSwipe;
            persistent.isSound = data1.isSound;
            persistent.Volume = data1.Volume;
            persistent.SquishCoins = data1.SquishCoins;


        }
    }

}

[Serializable]
class Playerspecs
{
    public int[] HighScores;

    public int SquishCoins;

    public int Score;

    public int Volume;

    public bool isSwipe;

    public bool isSound;

}

code accessing persistence data code

using System.Collections;
using System.Collections.Generic;
using UnityEngine;
using UnityEngine.SceneManagement;

public class script : MonoBehaviour {

    Persistent persistent;

    public void MainMenuLoad()
    {
        SceneManager.LoadScene("MainMenu", LoadSceneMode.Single);
    }

    public void Save()
    {
        Persistent.persistent.Savethis();
    }

    public void Load()
    {
        Persistent.persistent.Loadthis();
    }
    // Use this for initialization
    void Start () {
        Load();
    }
   
    // Update is called once per frame
    void Update () {
       
    }
}
2

I might not be of any help, but is there a reason why you aren’t using playerpref?

For so few things to save, I thought it would be a good option.

3

When the application is closed, check out the save file location outside of the app (like with your normal file browser). Is the file there, and does it contain the data you expected?

4

Are you calling the Save function from some other scripts to trigger writing out the data file?

Have you tried putting a breakpoint in both your Savethis and Loadthis functions to see exactly what’s happening when you call those functions?

How are you accessing the data in the static variables in the Persistent class? It looks like you have a reference to Persistent in your second script, but then you call Savethis and Loadthis through the static functions on the class. Did you assign an instance of Persistent to that reference?