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DmitriyYukhanov/ObjectTools.cs

Created March 21, 2017 11:18
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Updated code to get a Unity object id.
Raw
ObjectTools.cs
#define UNITY_5_PLUS
#if UNITY_4_5 || UNITY_4_6 || UNITY_4_7 || UNITY_4_8 || UNITY_4_9
#undef UNITY_5_PLUS
#endif
using UnityEngine;
using System.Reflection;
using UnityEditor;
namespace CodeStage.Maintainer.Tools
{
public class ObjectTools
{
private static PropertyInfo cachedInspectorModeInfo;
internal static long GetLocalIdentifierInFileForObject(Object unityObject)
{
long id = -1;
if (unityObject == null) return id;
if (cachedInspectorModeInfo == null)
{
cachedInspectorModeInfo = typeof(SerializedObject).GetProperty("inspectorMode", BindingFlags.NonPublic | BindingFlags.Instance);
}
SerializedObject serializedObject = new SerializedObject(unityObject);
cachedInspectorModeInfo.SetValue(serializedObject, InspectorMode.Debug, null);
SerializedProperty serializedProperty = serializedObject.FindProperty("m_LocalIdentfierInFile");
#if UNITY_5_PLUS
id = serializedProperty.longValue;
#else
id = serializedProperty.intValue;
#endif
if (id <= 0)
{
PrefabType prefabType = PrefabUtility.GetPrefabType(unityObject);
if (prefabType != PrefabType.None)
{
id = GetLocalIdentifierInFileForObject(PrefabUtility.GetPrefabParent(unityObject));
}
else
{
// this will work for the new objects in scene which weren't saved yet
id = unityObject.GetInstanceID();
}
}
if (id <= 0)
{
GameObject go = unityObject as GameObject;
if (go != null)
{
id = go.transform.GetSiblingIndex();
}
}
return id;
}
}
}
@DmitriyYukhanov
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DmitriyYukhanov commented Jul 19, 2019 •
edited

Also please note, there is a more elegant way for 2018.2 or newer:

public static long GetAssetLocalIdentifierInFile(Object unityObject)
{
	string guid;
	long id;

	if (!AssetDatabase.TryGetGUIDAndLocalFileIdentifier(unityObject, out guid, out id))
	{
		return -1;
	}

	return id;
}

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