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1
Question by putlucky · Dec 08, 2014 at 02:24 PM · c#editormenu

Null Reference exception when trying to extend the editor.

I'm just trying to make a window pop up from the Menu when clicking 'Open' but I get a null reference exception saying: Object reference not set to an instance of an object.

The code builds fine:

 using UnityEngine;
 using System.Collections;
 using UnityEditor;
  
 
 public class FFToolKit : MonoBehaviour {
    
     // Use this for initialization
 
 
     public string[] toolbarStrings = new string[] { "File", "View", "Edit" };
     public int toolbarInt = 0;
     void Start () {
     
     }
     
     // Update is called once per frame
     void Update () {
        
     }
     [MenuItem("FFToolKit/Open")]
     public static void ShowWindow()
     {
         EditorWindow.GetWindow(typeof(FFToolKit));
     }
 
     void OnGui()
     {
        toolbarInt = GUI.Toolbar(new Rect(5,5, 100, 20),toolbarInt, toolbarStrings);
     }
 }

Any ideas as to where I've gone wrong?

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Answer by Landern · Dec 08, 2014 at 02:28 PM

You should derive/inherit from EditorWindow, not monobehaviour:

  using UnityEngine;
  using System.Collections;
  using UnityEditor;
   
  public class FFToolKit : EditorWindow 
  {
      public string[] toolbarStrings = new string[] { "File", "View", "Edit" };
      public int toolbarInt = 0;
 
      [MenuItem("FFToolKit/Open")]
      public static void ShowWindow()
      {
          EditorWindow.GetWindow(typeof(FFToolKit));
      }
  
      void OnGui()
      {
         toolbarInt = GUI.Toolbar(new Rect(5,5, 100, 20),toolbarInt, toolbarStrings);
      }
  }
 

Please see the Editor Window topic in the manual.

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avatar image putlucky · Dec 08, 2014 at 02:39 PM 0
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Thanks, now to figure out why the window wont pop up...

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