Unity 3D – C# script – save and load file.

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This is a simple C# script example for a C# class Player.
The class Player come with this content into Player.cs C# script:

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using UnityEngine;
using System.Collections;
public class Player : MonoBehaviour {
    public int level = 1;
    public int energy = 100;
    public int health = 100;
    public int attack = 5;
    public int defense = 2;
 
    //make Save and Load
    public void Save() {
        SaveLoadManager.SavePlayer(this);
    }
    public void Load() {
        int[] loadStat = SaveLoadManager.LoadPlayer();
        level = loadStat[0];
        energy = loadStat[1];
        health = loadStat[2];
        attack = loadStat[3];
        defense = loadStat[4];
    }
// Use this for initialization
    void Start () {
}
// Update is called once per frame
    void Update () {
}
}

To make this C# script for saving the Player into one file I used this C# script named SaveLoadManager.cs:

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using UnityEngine;
using System;
using System.Collections;
using System.Runtime.Serialization.Formatters.Binary;
using System.IO;
 
public static class SaveLoadManager {
 
    public static void SavePlayer(Player player)
    {   //create binary file
        BinaryFormatter bf = new BinaryFormatter();
        FileStream stream = new FileStream(Application.persistentDataPath+"/player.sav",FileMode.Create);
        //this will use the class PlayerData
        PlayerData data = new PlayerData(player);
        //use Serialize -
        bf.Serialize(stream, data);
        //close file stream
        stream.Close();
    }
    //load the file
    public static int[] LoadPlayer() {
        //check the file exist
        if (File.Exists(Application.persistentDataPath + "/player.sav"))
        {
            //open binary file
            BinaryFormatter bf = new BinaryFormatter();
            FileStream stream = new FileStream(Application.persistentDataPath + "/player.sav", FileMode.Open);
            PlayerData data = bf.Deserialize(stream) as PlayerData;
            //close file stream
            stream.Close();
            //return data from file
            return data.stats;
        }
        else {
            Debug.LogError("File don't exist!");
            return new int[5];
        }
    }
}
// need to use using System; to use Serializable area.
[Serializable]
 
public class PlayerData {
    // more convenient for us to store data
    public int[] stats;
    public PlayerData(Player player) {
        stats = new int[5];
        stats[0] = player.level;
        stats[1] = player.energy;
        stats[2] = player.health;
        stats[3] = player.attack;
        stats[4] = player.defense;
    }
}

The script come with two parts for save and load files.
I used Serializable property to save binary file named player.sav.
This script used also the Application.persistentDataPath to take the path of application.
I used a Debug log output but if you want to used into real application then is no need to use.
You can deal with any player settings and make new like: player.magic or player.status.
Take a look at the comments in the script and that script highlights design issues.

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