Question Mark Texture

I am attempting to load a file from a folder into Unity at runtime using the WWW class. The problem is I always get the dreaded question mark texture but I don't know why.

I yield on the WWW class and log any errors (none appear, unless I change the path then I get a correct error about not finding the file). I even check isDone before assigning the texture; but still get the question mark. My texture is a png.

Does anyone have any ideas?

Thanks

Code (csharp):

1.  
2. function LoadTextureFromFile(FileName : String)
3. {
4.     var download : WWW = new WWW(FileName);
5.     yield download;
6.    
7.     if(download.error)
8.     {
9.         print(download.error);
10.         download  = null;
11.     }
12.     else if(download.isDone)
13.     {
14.         myTexture2D = download.texture;
15.         download  = null;
16.     }  
17.     else
18.     {
19.         Debug.Log("Couldnt load resource");
20.         download  = null;
21.     }  
22.  
23. }
24.  

 

Is it possible the PNG file is corrupt or invalid in some way? The download might complete successfully, but the data could still be incorrect.

 

Well it is difficult to check if the png is corrupt when downloaded onto the device (it may be corrupted in the progress); but the source png is fine. As for invalid? That's really what I am wondering about. In what other way can it be invalid?

Thanks

 

A PNG file could conceivably have valid checksums, but contain incorrect or inconsistent data. I think some apps make a sterner attempt than other to cope with incorrect data, so I guess a file may display in some apps, but not Unity. Have you tried the download with any other PNG files and found they work OK?

 

Is there a way to just kill that questionmark? I have it temporarily, and then a good texture updates over it but the red questionmark just ruins it for up to a second. A black one would be ideal. Is there any way to get to that and substitute it? Is it inside Unity or fetched from the web?

Cheers
AC

 

Anybody found a solution to this problem yet? I am facing this problem on mobile devices i.e ios and android

 

I have this problem and it is random, the PNG files are perfectly fine, there are times when they are correctly downloaded and there are times when the WWW returns an OK to the download but what I get is that red question mark, and it is random.

Why is this happening? It's like there are times when the WWW is not returning an error even when it failed.

Cheers.

 

There are times when I get also this:

"
You are trying to load data from a www stream which had the following error when downloading.
503 Service Temporarily Unavailable
UnityEngine.WWW:get_texture()
"

But the WWW did not return any error, this message appears when I try to access the texture.

Cheers.

 

Would be great to get an update on this if anyone has one!

 

Where you able to find a way to bypass/kill the question mark?

 

i face nearly the same problem. I try to do an app like Whatsapp. When i post an image it is sent to the server. Then the app downloads it from the server again. Then my app updates the chat and tries to display the new image(With a webrequest using "file//......path....". Very often i get this questionmark or even a grey texture. If I reopen the chat again then the image is always placed correctly.

What i believe is, that the file exists on the disk, but is still streaming the data. Later the file is fine.
I tried to check if the file isLocked ( U can find a weird solution for this, not sure if its correct) but it didnt help.

I struggle here a little.... if someone finds a solution after 11 years... it would be nice

 

Try storing a substitute file locally in your app, leave it as placeholder until desired pic has fully downloaded, maybe yield a frame then apply?

 

if i post the pic and first use the local file would work i guess.. but its not the right solution. If someone receives the pic then he doesnt have the local file... he would first see the questionmark and if he opens the chat again, then he would see the correct image..... not useable..
There seems not to be anything like an event that a file is fully downloaded..

 

I mean embedded in your app. Like a little " loading" icon or something, to ease the transition

 

oh, ok. I use a placeholder icon(later buffering animation) In the backround, there runs a coroutine that tries to get the real image, from disk. But when the webrequest returns a texture it stops. But its often a grey texture or a questionmark

 

here is my coroutine. it checks if File.exists... but it seems that existing is not the same as fully downloaded an saved..

Code (CSharp):

1.  IEnumerator LoadImage()
2.         {
3.             bool imgLoaded = false;
4.  
5.             while (!imgLoaded)
6.             {
7.                 var filePath = FilePool.GetFinalFilePath(_extension);
8.                 var fileInfo = new FileInfo(filePath);
9.                 var fileIsLocked = FileUtilities.IsFileLocked(fileInfo);
10.                 var fileAge = FileUtilities.GetFileAgeInSeconds(fileInfo);
11.  
12.                 if(File.Exists(filePath) && !fileIsLocked)
13.                 {
14.                     UnityWebRequest www = UnityWebRequestTexture.GetTexture("file://" + filePath );
15.                     yield return www.SendWebRequest();
16.                     try
17.                     {
18.                         //SpriteImage.sprite = GetThumbnail(_extension);
19.  
20.                         Texture2D myTexture = null;
21.  
22.                         if (www.isNetworkError || www.isHttpError)
23.                         {
24.                             throw new Exception(www.error);
25.  
26.                         }
27.                         else
28.                         {
29.                             myTexture = ((DownloadHandlerTexture)www.downloadHandler).texture;
30.                             RawImage.texture = myTexture;
31.                             imgLoaded = true;
32.                         }
33.                     }
34.                     catch (Exception exception)
35.                     {
36.                         //nothing
37.                         Debug.LogError(exception);
38.                     }
39.                 }
40.  
41.                 yield return new WaitForSeconds(1);
42.             }
43.  
44.             yield return 0;
45.         }

 

maybe i should add that the problems only occur on mobile platform(android)

 

when i add a counter and let it load the texture 4 times, then i get 4 different textures: the first is gray, the second has the top area with the real image but the majority of the image is gray. The 3rd has a little more of the real image... and so on...

So it is really like the file is streaming slowly in the background so i need an event or a property that tells me if the file is fully downloaded...

maybe i can store information about the size of the file in the database and wait until the file has the size?

 

https://forum.unity.com/threads/downloadhandlerscript-isdone-always-returns-false.664336/

it seems like there is no chance to get the information....

 

I have this problem with latest unity, also randomly, and it happens both in editor and on builds. And the thing is, the textures are fine, if I load the texture again from storage it gets loaded ok and I check the downloaded files manually - everything works fine.

Is there a way to check if the texture didn't load and try to reload it?

 

Hello, in my case i store the filepath in a list, then download it. After the download i remove it from the list.
In the background i have a textureRequestEngine that checks if the name is still in the list. If its not in the list anymore it reads the texture with webrequest. I kind of solved it but dont know if its the best way.
Sry for late answer.

 

oh, I rewrote everything with async await and now everything works, but I'm not sure that it's what helped...

 

Anybody solved this problem? Im having it too, it appears as a red question mark instead of the actual image. The image at the URL is perfectly fine. The same function loads other images from other urls and it works, very strange!

I dont know how to fix it, any ideas?

 

I don't know if this helps anyone, but I have gotten the question mark texture when loading .heic files in the Unity Editor (they work just fine on iOS and Android). So in my case it was an incompatible file type...

 

I have the same issue when I try to get this image, everything is OK
https://assets.weatherstack.com/images/wsymbols01_png_64/wsymbol_0008_clear_sky_night.png

However with this another image I got a Red question mark
https://assets.weatherstack.com/images/wsymbols01_png_64/wsymbol_0004_black_low_cloud.png

Both are png files I don't know why this behavior.

 

Both of those files are corrupt to Gimp.

 

The second one is not a png but a WebP file. When I download and save the file locally with FireFox, it actually gets the extension "webp". Opening the file in a n Hex editor shows this:


So it's a RIFF container that contains a WEBPVP8 image. So it's not a png file. The URL may have named it png, but that doesn't make it a png ^^. Writing the letters "CAT" onto a dog with paint won't turn the dog into a cat

 

Some help to fix "Cannot implicitly convert type 'Dog' into 'CAT':"

http://plbm.com/?p=263

(Sorry Bunny, couldn't resist... )

 

verify link, this ends with .pgn, if not, changue the ends of link. example:
.replace(".webp", ".png")