Download images from url, save to device, load into UGUI

Question

Currently working on an app, which downloads images (jpg and png) from an url, once downloaded, it wont be download again.

After the download process, the files are loaded into UGUI (RawImage).

It works great in editor and android, but crashes on IOS.

Here is the the code snippets (COPIED ALL THE RELEVANT SECTIONS):

Download images:

 IEnumerator loadBgImage(string _imgName)
     {
         string publisherDir = Application.persistentDataPath + "/" + STATIC.PUBLISER_NAME;
         string bookDir = Application.persistentDataPath + "/" + STATIC.PUBLISER_NAME + "/" + STATIC.BOOK_ID;
 
         if (!System.IO.Directory.Exists(publisherDir))
         {
             System.IO.Directory.CreateDirectory(publisherDir);
         }
 
         if (!System.IO.Directory.Exists(bookDir))
         {
             System.IO.Directory.CreateDirectory(bookDir);
         }
 
         WWW www = new WWW(STATIC.BOOK_URL + "/images/" + _imgName);
 
         yield return www;
 
         System.IO.File.WriteAllBytes(bookDir + "/" + _imgName, www.bytes);
     }

loading into UGUI:

 IEnumerator loadBgImage(UnityEngine.UI.RawImage _targtImg, string _imgName)
 {
 WWW www = new WWW("file://" + bookDir + "/" + _imgName);
 yield return www;
 byte[] imgBytes = www.bytes;
 Texture2D text2d = null;
 text2d = new Texture2D(16, 16,TextureFormat.PVRTC_RGB2,false);
 text2d.LoadImage(imgBytes);
 _targtImg.texture = text2d;
 RectTransform rect = _targtImg.GetComponent<RectTransform>();
 if (rect != null)
 {
   Vector2 offset = Vector2.zero;
   rect.offsetMin = offset;
   rect.offsetMax = offset;
   rect.localScale = Vector3.one;
 }
 }

The app crashes straight after loading all the images into the RawImage.

Is there a better way to do this? Where am I going wrong? Am I using the correct format for the Texture?

Answer 1

Answer by Nilesh Kumar · Feb 17, 2016 at 04:52 PM

www class already convert in texture no need to convert manually:

IEnumerator loadBgImage (UnityEngine.UI.RawImage _targtImg, string _imgName) {

             WWW www = new WWW ("file://" + bookDir + "/" + _imgName);
             yield return www;
             _targtImg.texture = www.texture;
             RectTransform rect = _targtImg.GetComponent<RectTransform> ();
             if (rect != null) {
                     Vector2 offset = Vector2.zero;
                     rect.offsetMin = offset;
                     rect.offsetMax = offset;
                     rect.localScale = Vector3.one;
             }
     }

Try this.it will work.

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Answer 2

Answer by zulfiqar-younus · Mar 01, 2017 at 07:16 AM

refined code for same problem.

IEnumerator loadBgImage(Image _targtImg, string imgURL) { WWW www = new WWW(imgURL); yield return www; _targtImg.sprite = Sprite.Create(www.texture, new Rect(0, 0, www.texture.width, www.texture.height), new Vector2(0.5f, 0.5f)); }

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Download images from url, save to device, load into UGUI

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