1

Hi,

I’ve been trying to figure out how to load a level by referencing an int that’s a variable in a different object’s script, but I’m doing something wrong.

I’m passing in the name of the int through the inspector and trying to use reflection:

private GameObject manager;

public void ClickAsync(string levelName)
{
    manager = GameObject.Find("GameManager");

    int levelValue = (int)manager.GetType().GetField(levelName).GetValue(manager);

    loadingImage.SetActive(true);
    StartCoroutine(LoadLevelWithBar(levelValue));
}

I’m getting this error:

NullReferenceException: Object reference not set to an instance of an object
Script_ClickToLoadAsync.ClickAsync (System.String levelName) (at Assets/scripts/Script_ClickToLoadAsync.cs:19)

Line 19 is this line:

int levelValue = (int)manager.GetType().GetField(levelName).GetValue(manager);

Could someone please explain to me what I’m doing wrong and how to solve this?

Thank you in advance for your assistance.

2

Try to split that sausage up and identify the null reference. Try something like:

Type type = manager.GetType();
FieldInfo field = type.GetField(levelName);
object value = field.GetValue(manager);
int levelValue = (int)value;

Of course, make sure manager and levelName are not null, and if not, you’ll easily identify which Get… fails to find what you’re looking for.

3

I figured out what I was doing wrong.

int levelValue = (int)manager.GetType().GetField(levelName).GetValue(manager);

Should have been:

int levelValue = (int)manager.GetComponent<Script_GameManager>().GetType().GetField(levelName).GetValue(manager.GetComponent<Script_GameManager>());

This is why my field was turning up Null.