[ANSWERED] Something very unique for a particular game

[Ser]

Does anyone know something very unique for a particular game started in KSP? The uniqueness must satisfy the following:

1. If I start a new game the value must remain the same through out this game. It shouldn't depend on settings etc.

2. If I delete a game and start a new one with the same name and settings, the value must be different.

For now I've found only one such value: the creation date of the game's save folder. But it is not very good because a user may back his game up, moving and recreating the folder. Additionally I'll have to mention everywhere "in clear form" that my mod reads outside its folder not to steal something from a user's PC.

May be there's something accessible within KSP public API?

Edited July 9, 2015 by Ser
answered

[Grumman]

So you want a random seed? Wouldn't the easiest way be to just generate a random number when campaign loads your plugin for the first time, and then save that random number?

[Ser]

Yes, it is a kind of random seed. Never thought of saving random number, may be that is solution. Thanks.

[simon56modder]

Try this :

using System.IO;

//.....

[KSPAddon(KSPAddon.Startup.SpaceCentre, false)]
    public class SpaceCentreLoading : MonoBehaviour
    {
        int GameValue;
        string persistentFileName = "test.txt"; // full name of the unique file including extension. The file is stored in the save folder
        System.Random random = new System.Random();
        void Start()
        {
            if (File.Exists("saves/" + HighLogic.SaveFolder + "/" + persistentFileName))
            {
                StreamReader sr = new StreamReader("saves/" + HighLogic.SaveFolder + "/" + persistentFileName);
                GameValue = int.Parse(sr.ReadLine());
                sr.Close();
            }
            else
            {
                int randomValue = random.Next();
                TextWriter tw = new StreamWriter("saves/" + HighLogic.SaveFolder + "/" + persistentFileName);
                tw.Write(randomValue);
                tw.Close();
                GameValue = randomValue;
            }
        }
    }

The unique value is stored in GameValue as an integer.

Edited July 7, 2015 by simon56modder

[Ser]

simon56modder, Thanks. But why not to store it in the save file by the means of persistence API? I'll have to save my mod's state anyway.

[simon56modder]

You mean directly in the persistent.sfs file ?

[Ser]

No, I mean save it via ScenarioModule or whatever way the ConfigNode values are put into persistent.sfs

[DMagic]

Are you looking for something that already exists or to create your own?

I think the resource system random seed might work for you.

ResourceScenario.Instance.gameSettings.Seed

You can ask Roverdude, but I think that value is independent of anything else and persists throughout a save file.

[sarbian]

[KSPScenario(ScenarioCreationOptions.AddToAllGames, GameScenes.SPACECENTER, GameScenes.EDITOR, GameScenes.FLIGHT, GameScenes.TRACKSTATION)]
public class MySeedScenario : ScenarioModule
{
	[KSPField(isPersistant = true)]
	public int seed = 0;

    public Start()
    {
		if (seed == 0)
			seed = something;
    }
}

[Ser]

Are you looking for something that already exists or to create your own?

I think the resource system random seed might work for you.

ResourceScenario.Instance.gameSettings.Seed

You can ask Roverdude, but I think that value is independent of anything else and persists throughout a save file.

I'm looking for anything that might satisfy my requirements. I'll try that. Thanks.

@sarbian

Thanks for the script. What are the params in [KSPScenario(ScenarioCreationOptions.AddToAllGames, GameScenes.SPACECENTER, GameScenes.EDITOR, GameScenes.FLIGHT, GameScenes.TRACKSTATION)] ?

[simon56modder]

API for KSPScenario : http://anatid.github.io/XML-Documentation-for-the-KSP-API/class_k_s_p_scenario.html

KSPScenario (ScenarioCreationOptions createOptions, params GameScenes[] tgtScenes)

[Ser]

Are you looking for something that already exists or to create your own?

I think the resource system random seed might work for you.

ResourceScenario.Instance.gameSettings.Seed

You can ask Roverdude, but I think that value is independent of anything else and persists throughout a save file.

I've tested the method you've advised and that's exactly what I've been looking for.