Calling a variable from a different script

[acesouthall]

I’ve seen a few answers but no matter what I try I get no lucky

// Create an object of main menu
public MainMenu mainMenu;
	
public int gEnzyme;

From the MainMenu script I want to call a variable called enzyme of type int

Within the OnGUI function I assign the variable to the MainMenu variable:

gEnzyme = mainMenu.enzyme;

I’ve done this as I am trying to display the integer within a Box using ‘.ToString()’.

GUI.Box (new Rect(0, 300, 100, 50), enzyme.ToString());

I’ve tried all different ways of trying this even ones I feel are pointless just to see.

I’ve probably made a rookie error somewhere

The error I keep getting is:

NullReferenceException: Object reference not set to an instance of an object Game.OnGUI ()

Thank you in advance!

[TheRaven]

gEnzyme.ToString() perhaps.

I assume you are calling enzyme.ToString() in a class outside of the mainmenu class.

[meat5000]

If they are on the same object simply use GetComponent(Scriptname).variable.

If not on the same object, Find the object with GameObject.Find or FindWithTag and then use GetComponent.

Something like :

objectInstance = GameObject.Find("menuObject"); //find and store mainmenu gameobject

variableInstance = objectInstance.GetComponent(MainMenu).gEnzyme; //access variable in script on that objects's newly created instance

These are in JS, you would need the C# equivalents, which you can find in the scripting reference (or here)