How to read a texture from an image from local path?

I am looking to get the final result as texture from Application.persistent path.How to read an image from local path.WWW is obsolete can we use it now to read a file from local path.This is what I tried but getting a null pointer exception

Code (CSharp):

1.  IEnumerator AddImageToLibrary()
2. {
3.      WWW www = new WWW(Application.persistentDataPath + "/" + filename);
4.                //Waitng for operation to complete.is this correct?
5.                 while (!www.isDone)
6.                 {
7.                     Debug.Log("Not done");
8.                     yield return null;
9.                 }
10.              
11.                 if (www == null)
12.                 {
13.                     Debug.Log("www is null");
14.                 }
15.                 else
16.                 {
17.                    imgToTexture2d = www.texture;
18.                 }
19.              
20.  
21. }

 

You can use any builtin C# I/O classes:

https://docs.microsoft.com/en-us/dotnet/api/system.io.file.readallbytes?view=netcore-3.1
https://docs.microsoft.com/en-us/dotnet/api/system.io.filestream?view=netcore-3.1
https://docs.microsoft.com/en-us/dotnet/api/system.io.stream.readasync?view=netcore-3.1

 

You need any permission to read from Android path?Also the file to read is an image,need to convert it to texture.

 

That's a start, but it doesn't turn the bytes you get from a hard drive into a Unity-compatible Texture object.

Fortunately this is pretty easy, and there is a LoadImage function that gets the texture from bytes.

Code (csharp):

1.  
2.             var imageBytes = File.ReadAllBytes(path);
3.             Texture2D returningTex = new Texture(2,2); //must start with a placeholder Texture object
4.             returningTex.LoadImage(imageBytes);
5.             returningTex.name = objectName;
6.             return returningTex;
7.        

 

From the documentation for persistentDataPath (https://docs.unity3d.com/ScriptReference/Application-persistentDataPath.html):

 

Why do we need to specify the height and width of texture.The image going to be read can have any size

 

It's a placeholder, and doesn't need to be the actual dimensions of the loaded texture. In fact it should be as small as possible so as not to waste resources.