Version: 2018.4
LanguageEnglish
  • C#

AssetDatabase.TryGetGUIDAndLocalFileIdentifier

Suggest a change

Success!

Thank you for helping us improve the quality of Unity Documentation. Although we cannot accept all submissions, we do read each suggested change from our users and will make updates where applicable.

Close

Submission failed

For some reason your suggested change could not be submitted. Please <a>try again</a> in a few minutes. And thank you for taking the time to help us improve the quality of Unity Documentation.

Close

Cancel

Obsolete Please use the overload of this function that uses a long data type for the localId parameter, because this version can return a localID that has overflowed. This can happen when called on objects that are part of a Prefab.

Declaration

public static bool TryGetGUIDAndLocalFileIdentifier(Object obj, out string guid, out int localId);
Obsolete Please use the overload of this function that uses a long data type for the localId parameter, because this version can return a localID that has overflowed. This can happen when called on objects that are part of a Prefab.

Declaration

public static bool TryGetGUIDAndLocalFileIdentifier(int instanceID, out string guid, out int localId);

Declaration

public static bool TryGetGUIDAndLocalFileIdentifier(Object obj, out string guid, out long localId);

Declaration

public static bool TryGetGUIDAndLocalFileIdentifier(int instanceID, out string guid, out long localId);

Parameters

instanceID InstanceID of the object to retrieve information for.
obj The object to retrieve GUID and File Id for.
guid The GUID of the asset.
localId The local file identifier of this asset.

Returns

bool True if the guid and file id were successfully found, false if not.

Description

Warning Use the overload with a long localId parameter. Using the overload with an integer localId parameter can cause an integer overflow in localId. This can happen when the object passed to the API is part of a Prefab.

Get the GUID and local file id from an object instance id.

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()); } }