How do I read and write non-static variables from a different class?

Questions & Answers
1

I am making a game where i save the player’s settings in a json file. But i cant figure out how to access the variables in the classes i save. The variables cant be static because then i cant save them.

The save script:

using System.Collections;
using System.Collections.Generic;
using UnityEngine;
using System.IO;

public static class SaveManager
{
	public static void save(Total total)
	{
		string dir = Application.persistentDataPath + "/SaveData/";
		
		if(!Directory.Exists(dir))
		{
			Directory.CreateDirectory(dir);
		}
		
		string json = JsonUtility.ToJson(total, true);
		File.WriteAllText(dir + "Saves.json", json);
	}
	
	public static Total load()
	{
		string fullPath = Application.persistentDataPath + "/SaveData/" + "Saves.json";
		Total total = new Total();
		
		if(File.Exists(fullPath))
		{
			string json = File.ReadAllText(fullPath);
			total = JsonUtility.FromJson<Total>(json);
		}else
		{
			Debug.Log(fullPath + "Doesnt exist");
		}
		
		return total;
	}
}

The script with save and load functions and the classes to save:

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

public class SaveScript : MonoBehaviour
{
   public Total total;
   
   public void save()
   {
		SaveManager.save(total);
		Debug.Log("saved");
   }
   
   public void load()
   {
		total = SaveManager.load();
		Debug.Log("loaded");
   }
   
}

[System.Serializable]
public class Settings
{
	public int quality = 2;
	public int fullscreenMode = 0;
	public float masterVolume = 1f;
	public float musicVolume = 0.5f;
}

[System.Serializable]
public class SystemVars
{
	public int yes;
}

[System.Serializable]
public class Info
{
	public string yes = "nothing yet";
}

[System.Serializable]
public class Total
{
	public Settings Settings;
	public SystemVars System;
	public Info Info;
}

And the settings script:
using System.Collections;
using System.Collections.Generic;
using UnityEngine;
using UnityEngine.Audio;
using UnityEngine.UI;

public class SetSettings : MonoBehaviour
{
	public AudioMixer audioMixer;
	
	public SaveScript saveScript;
	
	void Start()
	{	
		saveScript = GameObject.Find("Save").GetComponent<SaveScript>();
		saveScript.load();
		setAll();
	}
	
	public void setQuality(int qualityIndex)
	{
		QualitySettings.SetQualityLevel(qualityIndex, true);
	}
	
	public void setFullscreenMode(int fullscreenMode)
	{
		var nothing = fullscreenMode switch
		{
			0 => Screen.fullScreenMode = FullScreenMode.ExclusiveFullScreen,
			1 => Screen.fullScreenMode = FullScreenMode.FullScreenWindow,
			2 => Screen.fullScreenMode = FullScreenMode.MaximizedWindow,
			3 => Screen.fullScreenMode = FullScreenMode.Windowed,
			_ => Screen.fullScreenMode = FullScreenMode.FullScreenWindow
		};
	}
	
	public void setMasterVolume(float masterVolume)
	{
		GameObject.Find("Canvas").GetComponent<SetText>().setMasterVolumeText();
		audioMixer.SetFloat("masterVolume", Mathf.Log10 (masterVolume) * 20);
	}
	
	public void setMusicVolume(float musicVolume)
	{
		GameObject.Find("Canvas").GetComponent<SetText>().setMusicVolumeText();
		audioMixer.SetFloat("musicVolume", Mathf.Log10 (musicVolume) * 20);
	}
	
	public void restoreDefaults()
	{
		setQuality(2);
		setFullscreenMode(0);
		setMasterVolume(1f);
		setMusicVolume(0.5f);
	}
	
	public void setAll()
	{	//Take the values from settings class and assign them in functions
			setQuality(s.quality);
		//	Debug.Log(s.quality);
			setFullscreenMode(s.fullscreenMode);
		//	Debug.Log(s.fullscreenMode);
			setMasterVolume(s.masterVolume);
		//	Debug.Log(s.masterVolume);
			setMusicVolume(s.musicVolume);
		//	Debug.Log(s.musicVolume);
		//	GameObject.Find("Canvas").GetComponent<SetText>().quality.value = s.quality;
		//	GameObject.Find("Canvas").GetComponent<SetText>().fullscreenMode.value = s.fullscreenMode;
		//	GameObject.Find("Canvas").GetComponent<SetText>().masterVolumeSlider.value = s.masterVolume;
		//	GameObject.Find("Canvas").GetComponent<SetText>().musicVolumeSlider.value = s.musicVolume;
	}
}

Can someone please tell me how i can change and read the files in the Savescript class from the SetSettings class?

2

You need to supply a reference to the instance of the object that has the variable you want to access.

YourClass yourclass;
yourclass.variableToAccess;