How to get an image from a url and set it to an object in Unity

Question

I have a method to create objects from prefabs. The prefab consists of the texts "Title" and "Description", as well as the image "Image".

In the method below, I get the text for "Title", "Description" and the URL of the image for "Image".

using System.Collections;
using UnityEngine;
using UnityEngine.UI;
using Newtonsoft.Json.Linq;

using System.Threading.Tasks;
using UnityEngine.Networking;

public class CreateMonumentButtons : MonoBehaviour
{
    public RectTransform prefarb;
    public RectTransform content;

    private string City;
    private string URL = DataHolders.URL;

    async private void Awake()
    {
        City = DataHolders.City;
        StartCoroutine(Get());
    }

    void InitializeItemView (GameObject viewGameObject, string TextTitle, string TextDescription, string URLImg)
    {
        TestItemView view = new TestItemView(viewGameObject.transform);
        view.Title.text = TextTitle;
        view.Description.text = TextDescription;

        File fileData;
        Texture2d txture;
        (File.Exists(URLImg))     {
            fileData = File.ReadAllBytes(URLImg); //read the bytes from the file at URLImg's destination
            txture = new Texture2D(0,0);//makes the new texture
            txture.LoadImage(fileData);//loads the image from the file
            view.Img.sprite = Sprite.Create(txture, new Rect(0,0,200,200), new Vector2());
            //set Img.sprite to a new sprite at 0,0 with the dimensions 200x200
        }
    }

    public class TestItemView
    {
        public Text Title;
        public Text Description;
        // public Image Image;

        public TestItemView (Transform rootView)
        {
            Title = rootView.Find("Title").GetComponent<Text>();
            Description = rootView.Find("Description").GetComponent<Text>();
            // Image = rootView.Find("Image").GetComponent<Image>();
        }
    }

    private IEnumerator Get()
    {
        WWWForm formT = new WWWForm();

        formT.AddField("City", City);

        WWW wwwT = new WWW(URL + "get_monuments.php", formT);
        yield return wwwT;
        if (wwwT.error != null)
        {
            Debug.Log("Ошибка: " + wwwT.error);
            yield break;
        }

        WWWForm formD = new WWWForm();

        formD.AddField("City", City);

        WWW wwwD = new WWW(URL + "get_description.php", formD);
        yield return wwwD;
        if (wwwD.error != null)
        {
            Debug.Log("Ошибка: " + wwwD.error);
            yield break;
        }

        WWWForm formI = new WWWForm();

        formI.AddField("City", City);

        WWW wwwI = new WWW(URL + "get_img.php", formI);
        yield return wwwI;
        if (wwwI.error != null)
        {
            Debug.Log("Ошибка: " + wwwI.error);
            yield break;
        }

        WWWForm formL = new WWWForm();

        formL.AddField("City", City);

        WWW wwwL = new WWW(URL + "get_lenLists.php", formL);
        yield return wwwL;
        if (wwwL.error != null)
        {
            Debug.Log("Ошибка: " + wwwL.error);
            yield break;
        }

        DataHolders.listLen = int.Parse(wwwL.text);
        DataHolders.listImg = wwwI.text;
        DataHolders.listDescription = wwwD.text;  
        DataHolders.listMonuments = wwwT.text; 

        var ListTitls = JObject.Parse(DataHolders.listMonuments);
        var ListDescriptions = JObject.Parse(DataHolders.listDescription);
        var ListImgs = JObject.Parse(DataHolders.listImg);

        for( int i = 0; i < DataHolders.listLen; i++ )
        {
            // Debug.Log(i.ToString());
            var Title = (string) ListTitls[i.ToString()];
            var Description = (string) ListDescriptions[i.ToString()];
            var Img = (string) ListImgs[i.ToString()];

            var instance = GameObject.Instantiate(prefarb.gameObject) as GameObject;
            instance.transform.SetParent(content, false);
            InitializeItemView(instance, Title, Description, Img);
        }      
    }
}

I don't understand how can I get an image from an image url and set its value to "Image".

But I am a beginner, so it is desirable that you explain something in simple terms.

It can be Googled as `unity image from url`, some links: [forum 2020](https://forum.unity.com/threads/image-from-url.1052135/), [stackoverflow question 2015](https://stackoverflow.com/questions/31765518/how-to-load-an-image-from-url-with-unity) — Alexey S. Larionov, Mar 11 '22 at 17:03
[Retrieving a Texture from an HTTP Server (GET)](https://docs.unity3d.com/Manual/UnityWebRequest-RetrievingTexture.html) — derHugo, Mar 11 '22 at 18:58

Rage Man · Answer 1 · 2022-03-14T16:03:51.613

0

Image doesn't have an attribute of Text, and instead you should get the file, load the image to a texture and set the Image's sprite as the texture.

File fileData;
Texture2d txture;
if (File.Exists(URLImg))     {
         fileData = File.ReadAllBytes(URLImg); //read the bytes from the file at URLImg's destination
         txture = new Texture2D(0,0);//makes the new texture
         txture.LoadImage(fileData);//loads the image from the file
         view.Img.sprite = Sprite.Create(txture, new Rect(0,0,200,200), new Vector2());
         //set Img.sprite to a new sprite at 0,0 with the dimensions 200x200
     }

with view.Img.sprite as an image rather than "text" because it's not painting text and rather an image.

edited Mar 14 '22 at 16:03

answered Mar 11 '22 at 17:06

Rage Man

41
1
6

For some reason, unity says "(30,30): error CS1002: ; expected" – Канал Shoker 2 Mar 12 '22 at 07:27
I would need to see your code for that. it sounds like you're missing a semicolon @КаналShoker2 – Rage Man Mar 13 '22 at 19:35
It maps to this location `(File.Exists(URLImg))` – Канал Shoker 2 Mar 14 '22 at 13:49
@КаналShoker2 it seems like URLImg might not be a variable or something else may be wrong, again I would need to see at least the full method to see what's going wrong – Rage Man Mar 14 '22 at 14:43
I have updated the code in the question – Канал Shoker 2 Mar 14 '22 at 14:52
@КаналShoker2 try to put "using System.IO" at the top of your code, this may fix it. – Rage Man Mar 14 '22 at 15:37
nothing has changed – Канал Shoker 2 Mar 14 '22 at 15:50
@КаналShoker2 my bad. the part in the parentheses was supposed to be an if statement. I edited my answer. – Rage Man Mar 14 '22 at 16:04
Now he writes: `Assets\Scripts\CreateMonumentButtons.cs(30,9): error CS0246: The type or namespace name 'File' could not be found (are you missing a using directive or an assembly reference?) ` – Канал Shoker 2 Mar 14 '22 at 16:08
And: `Assets\Scripts\CreateMonumentButtons.cs(32,13): error CS0103: The name 'File' does not exist in the current context` – Канал Shoker 2 Mar 14 '22 at 16:09
@КаналShoker2 ```using System.IO.File;``` – Rage Man Mar 14 '22 at 16:14
`A 'using namespace' directive can only be applied to namespaces; 'File' is a type not a namespace. Consider a 'using static' directive instead` – Канал Shoker 2 Mar 14 '22 at 16:18
@КаналShoker2 when you put the if statement in did you remove ```using System.IO;```? – Rage Man Mar 14 '22 at 16:20
`Cannot declare a variable of static type 'File'` – Канал Shoker 2 Mar 14 '22 at 16:23
`Cannot implicitly convert type 'byte[]' to 'System.IO.File'` – Канал Shoker 2 Mar 14 '22 at 16:23
`Argument 2: cannot convert from 'System.IO.File' to 'byte[]'` – Канал Shoker 2 Mar 14 '22 at 16:23
1

I found a solution. I changed your code like this: `Texture2D txture; if (System.IO.File.Exists(URLImg)) { var fileData = System.IO.File.ReadAllBytes(URLImg); //read the bytes from the file at URLImg's destination txture = new Texture2D(0,0);//makes the new texture txture.LoadImage(fileData);//loads the image from the file view.Image.sprite = Sprite.Create(txture, new Rect(0,0,200,200), new Vector2()); //set Img.sprite to a new sprite at 0,0 with the dimensions 200x200 }` – Канал Shoker 2 Mar 14 '22 at 16:32

score 0 · Answer 2 · answered Mar 11 '22 at 20:25

Unity Beginner has explained it easily in just 1.5 minutes to Load Image from WebLink or URL.

But here, they used WWW, which is obsolete, so use UnityWebRequest instead. Here are the changes you need to perform while changing from WWW to UnityWebRequest.

score 0 · Answer 3 · answered Sep 23 '22 at 06:48

0

I made a simple plugin for this. If someone is interested, check this repo

answered Sep 23 '22 at 06:48

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How to get an image from a url and set it to an object in Unity

3 Answers3