GetComponent problem

Question

I've got the following code:

using UnityEngine; using System.Collections;

 public class SpriteManager : MonoBehaviour {

     Mesh mesh;

     void Start () {
         if(GetComponent< MeshFilter >()) {
             print(&quot;Attached&quot;);
         }
         mesh = GetComponent&lt; MeshFilter &gt;().mesh;
     }
 }

I do get the 'Attached' message in the console but it also throws the following error: NullReferenceException: Object reference not set to an instance of an object SpriteManager.Start

Any ideas why this error pops up?

Answer 1

Best Answer

Answer by ScroodgeM · Jul 31, 2012 at 08:14 PM

move 'mesh=' line inside IF block too. it can be executed even if no MeshFilter attached

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Answer 2

Answer by Bunny83 · Jul 31, 2012 at 08:55 PM

Like Scroodge said, It's useless to do a check and then ignoring the result. Also you should use a true boolean expression and not just a reference.

 public class SpriteManager : MonoBehaviour
 {
     Mesh mesh;
     
     void Start ()
     {
         var MF = GetComponent< MeshFilter >();
         if(MF != null)
         {
             print("Attached");
             mesh = MF.mesh;
         }
     }
 }

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GetComponent problem

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