koobas.hobune.stream
How do I access variables of prefabs I am loading via Resource.LoadAll, in script(C#)
I am having trouble retrieving variable information on some prefabs I am loading via resource.loadall.
I have a class called Tile that I have applied to some quad prefabs I have made in Unity, in it I have a few variables like displayName. They are public, and for each prefab I made and have in a resource folder I have a Display Name I have set in the Inspector.
I have these quads generating a tiled map, I basically use Resource.LoadAll to put all of the prefab tiles into an Object array, like so:
Object[] prefabarray = Resources.LoadAll ("PrefabTiles/Primary", typeof(GameObject));
Just after this, I randomly pick one and have it instantiated into particular position, but before that I would like to retrieve or test what Display Name that random tile has, but when I try this:
Debug.Log (prefabarray[0].displayName);
I get an error, and that var does not exist for that object. I am presuming I am missing a cast or something(you can see I am casting it as a GameObject above, don't know if that is correct, but debug.log tells me it IS a GameObject).
In game though, when I mouse-enter a certain tile, it will spit out displayName(I have it set up to do that). So in script I am just unable to get that info.
Any help is greatly appreciated, thanks in advance.
As you are saying displayName is not a variable of Object, but a variable of Tile. So you need to cast your list to another type. In the Resources.LoadAll you are not actually casting to GameObject, but you are telling it to load all GameObjects, the list returned will still be a Object[] list. To cast the list to GameObject you can do this:
GameObject[] prefabArray = Resources.LoadAll("PrefabTiles/Primary", typeof(GameObject)) as GameObject[];
Notice I changed the type of the list as well as casting after the Resources.LoadAll function.
We still need to get a hold of displayname which is in the Tile component on those GameObjects. You can get a hold of components on GameObjects with the GetComponent function:
Debug.Log (prefabarray[0].GetComponent<Tile>().displayName);
We can change some things around in the load section to make this even easier:
Tile[] prefabArray = Resources.LoadAll("PrefabTiles/Primary", typeof(Tile)) as Tile[];
Here we are telling the function to load all GameObjects with a Tile component on it, we get a Object[] list then cast it to a Tile[] list and store it in the Tile[] prefabArray.
Then you we can do this to access the values:
Debug.Log (prefabarray[0].displayName);
Thanks for your response, but when I use what you pasted(both) I get a NullReferenceException and an empty array.
Here is the code using Tile:
GameObject[] prefabArray = Resources.LoadAll("PrefabTiles/Primary", typeof(GameObject)) as GameObject[];
Debug.Log (prefabArray.Length);
Debug.Log (prefabArray[0].displayName);
$$anonymous$$y bad, apparently you can not cast the Object[] into GameObject[] directly like that after all. But you can use this to specify the type ins$$anonymous$$d:
GameObject[] prefabArray = Resources.LoadAll<GameObject>("PrefabTiles/Primary");
With this method there is no need to cast because the function returns a GameObject[].
Got it to work with a slight change. With what you gave me above I needed NikoBusiness's example of using GetComponent to get any of my Tile properties to be accessed, so I ended up just doing:
Tile[] prefabArray = Resources.LoadAll<Tile>("PrefabTiles/Primary");
now I can get to those Tile properties directly.
Thanks!
Oh, and for future reference, what is that "< Tile >" part actually called, is that casting or something else?
I did show the use of GetComponent in my answer as well, but oh well. No matter. =P Glad I could help.
The arrow part is called a Generic Type Parameter. It is not casting, we supply the Type we are using and the function can then use that to return the correct type as well. It can not be used just anywhere though, the function needs to support it of course. And it is used for much more than only returning the correct type.
GetComponent uses it as well, and you can implement it yourself in functions and classes. You can read more about it **here**.
you have to use getComponent
Debug.Log (prefabarray[0].GetComponent<ScriptName>.displayName);
Thanks Niko, this helped me figure out the solution that ended up working below.
