instanceID | InstanceID of the object to retrieve information for. |
obj | The object to retrieve GUID and File Id for. |
assetRef | The asset reference to retrieve GUID and File Id for. |
guid | The GUID of an asset. |
localId | The local file identifier of this asset. |
bool True if the guid and file id were successfully found, false if not.
Get the GUID and local file id from an object instance id.
Warning: Avoid the obsolete versions of this function, which use int
for the localId
parameter instead of long
. Local Ids can be longer than 32 bits in some cases, such as for Prefabs.
When Unity serializes an asset reference it points to two things: the GUID and file ID. GUID is a unique hash, and file ID is a value relative to the asset. Both of these values are used when a serialized asset references another asset.
If working with a text serialized project (see Editor Settings) it is possible to manually modify this information. A common use is moving C# script files from a project to a DLL while keeping any GameObjects using these scripts intact. As an example, suppose your project contains a C# MonoBehaviour, a Scene, and a GameObject with this script attached. When serialized the Unity Scene file will contain something that looks like this (reduced to the relevant parts):
/* example .unity Scene contents:
--- !u!1 &65078845 GameObject: m_Component: -component: {fileID : 65078850} --- !u!114 &65078850 MonoBehaviour: m_Script: {fileID : 11500000, guid : 9cbd8cdf99d44b58972fbc7f6f38088f, type : 3}
*/
using System.Text; using UnityEngine; using UnityEditor;
class ShowAssetIds { [MenuItem("Assets/Show Asset Ids")] static void MenuShowIds() { var stringBuilder = new StringBuilder();
foreach (var obj in AssetDatabase.LoadAllAssetsAtPath(AssetDatabase.GetAssetPath(Selection.activeObject))) { string guid; long file;
if (AssetDatabase.TryGetGUIDAndLocalFileIdentifier(obj, out guid, out file)) { stringBuilder.AppendFormat("Asset: " + obj.name + "\n Instance ID: " + obj.GetInstanceID() + "\n GUID: " + guid + "\n File ID: " + file); } }
Debug.Log(stringBuilder.ToString()); } }
Additional resources: GlobalObjectId