Sharing Variables Between Projects

Question

I want to share/get variables from the other project when it runns, for an example. User opens the game, scene is loaded in the first one, the second game opens and gets variables from the first one(in void Update or IEnumarator). I couldn't find anything on the internet about this.

Answer 1

Quick method: go under File > Build Settings > Player Settings and change the "Company Name" and "Product Name" of both projects so both have the same values and keep using "Application.persistentDataPath". OR.....

If you want to just keep the data between projects, but not between different projects' builds, you can use that:

 using System.IO;
 using System.Runtime.Serialization.Formatters.Binary;
 using UnityEngine;
 
 public class PlayerDataExtension { }
 
 public class SaveLoad
 {
     string editorPath = "C:/idleExtension.dat";
     string buildPath = Application.dataPath + "/idleExtension.dat";
 
     public void SaveExtension()
     {
 #if UNITY_EDITOR
         Save(editorPath);
 #else
         Save(buildPath);
 #endif
     }
 
     public void LoadExtension()
     {
 #if UNITY_EDITOR
         Load(editorPath);
 #else
         Load(buildPath);
 #endif
     }
 
     private void Save(string dataPath)
     {
         BinaryFormatter bf = new BinaryFormatter();
         FileStream file = File.Create(dataPath);
         PlayerDataExtension data = new PlayerDataExtension();
 
         bf.Serialize(file, data);
         file.Close();
     }
 
     private void Load(string dataPath)
     {
         if (File.Exists(dataPath))
         {
             BinaryFormatter bf = new BinaryFormatter();
             FileStream file = File.Open(dataPath, FileMode.Open);
             PlayerDataExtension data = (PlayerDataExtension)bf.Deserialize(file);
 
             file.Close();
         }
     }
 }

Else, if you want to keep your data everywhere, then you can define your own persistent path for each platform:

 using System.IO;
 using System.Runtime.Serialization.Formatters.Binary;
 using UnityEngine;
 
 public class PlayerDataExtension { }
 
 public class SaveLoad
 {
 #if UNITY_STANDALONE_WIN || UNITY_EDITOR_WIN
     string folderPath = "C:/MyFolderNameThatUserShouldNotDeleteOrWillLoseItsSave";
 #elif UNITY_STANDALONE_OSX || UNITY_EDITOR_OSX
     string folderPath = "A folder structure relative to windows one.";
 #elif UNITY_STANDALONE_LINUX
     string folderPath = "I think that you already got that one.";
 #endif
     string fileName = "/idleExtension.dat";
 
     public void SaveExtension()
     {
         if (!Directory.Exists(folderPath))
         {
             Directory.CreateDirectory(folderPath);
         }
 
         BinaryFormatter bf = new BinaryFormatter();
         FileStream file = File.Create(folderPath + fileName);
         PlayerDataExtension data = new PlayerDataExtension();
 
         bf.Serialize(file, data);
         file.Close();
     }
 
     public void LoadExtension()
     {
         if (Directory.Exists(folderPath) && File.Exists(folderPath + fileName))
         {
             BinaryFormatter bf = new BinaryFormatter();
             FileStream file = File.Open(folderPath + fileName, FileMode.Open);
             PlayerDataExtension data = (PlayerDataExtension)bf.Deserialize(file);
 
             file.Close();
         }
     }
 }

Answer 2

Answer by phil_me_up · Feb 01, 2016 at 10:09 PM

This depends on what you're trying to do.

If you're talking about having several people work on the same project, then you want to look at some sort of source control
If you're talking about trying to share variables between separate development projects, then you might want to look at using scriptableobjects
If your talking about sharing some sort of save data, then you'll need to save out or serialise your data in some location where both projects can read from
If you're talking about two people sharing variables when playing the same game then you'll need to syncronise the data somehow (some server setup depending on what you want)

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Chilluminatler · Feb 02, 2016 at 02:22 PM 0

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One person, yes two completely different projects. I already have Load and Save function (both are being serialised). Thats the problem I couldn't really get how to save them in the same place, with persistent data path they go to the Appdata. And I couldn't really get how to use dataPath. No multiple players atm.

Chilluminatler · Feb 02, 2016 at 03:08 PM 0

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Here is my code from the extension (The second project who will take the data)

 public void SaveExtension(){
         BinaryFormatter bf = new BinaryFormatter();
         FileStream file = File.Create(Application.dataPath + "/idleExtension.dat");
         PlayerDataExtension data = new PlayerDataExtension();
 
         bf.Serialize(file, data);
         file.Close();
     }
 
     public void LoadExtension(){
         if(File.Exists(Application.persistentDataPath + "/idleExtension.dat")){
             BinaryFormatter bf = new BinaryFormatter();
             FileStream file = File.Open(Application.persistentDataPath + "/idleExtension.dat", FileMode.Open);
             PlayerDataExtension data = (PlayerDataExtension)bf.Deserialize(file);
         
             file.Close();
         }
     }

brunocoimbra Chilluminatler · Feb 02, 2016 at 04:16 PM 0

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Your problem is with "Application.dataPath" and "Application.pesistentDataPath".

If you are using windows, you can try something like:

  FileStream file = File.Create("C:/idleExtension.dat");
  FileStream file = File.Open("C:/idleExtension.dat", FileMode.Open);

Chilluminatler brunocoimbra · Feb 02, 2016 at 04:33 PM 0

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Mhm, that's a solution, but the problem with this one is that what if the User doesn't install/extract it on C drive. And he's going to see the folder and delete it (deleting the save).

Answer 3

Answer by pankaj_varma · Mar 24, 2019 at 06:48 AM

Share Data between two or more unity apps

https://github.com/PankajVermaGit/CentralDatabase

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Sharing Variables Between Projects

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