File not found in WebGL

Unity Engine
1

I’m new to unity webgl,the below code works well in windows desktop unity (in output i get “File Found”), but in javascript(webgl) it doesn’t work.

using System.Collections;
using System.Collections.Generic;
using System.IO;
using UnityEngine;

public class checkPath : MonoBehaviour {

    // Use this for initialization
    void Start ()
    {
        string filePath = "D:/testFile.txt";
        Debug.Log("Looking for file: " + filePath);
        if (File.Exists(filePath))
        {
            Debug.Log("File Found");
        }
        else Debug.Log("File not Found");
    }
 
    // Update is called once per frame
    void Update () {
     
    }
}

steps to reproduce the message:

  • create a empty unity project.
  • attach above script to any gameobject.
  • build the project to webgl
  • open the generated html file

note: i tried running the html file from vscode server still it shows “File not Found” in browser console(both Firefox and Chrome)

below is the output from browser console

(Filename: /Users/builduser/buildslave/unity/build/artifacts/generated/WebGL/runtime/DebugBindings.gen.cpp Line: 51)

File not Found
(Filename: /Users/builduser/buildslave/unity/build/artifacts/generated/WebGL/runtime/DebugBindings.gen.cpp Line: 51)```

i am using unity 2017.4.12f1 i had tried with unity 2019 still getting same message

**Update**: i tried copying testFile.txt to build folder and in TemplateData folder as well.
in code i added
```if (File.Exists("file:///testFile"))
if (File.Exists("/testFile"))
if (File.Exists("testFile"))```

none of these returns true in js (browser console)!
2

as far as I know you can not access the local file system with webgl.

1 Like
3

In WebGL/WASM builds File.* methods are mapped to IndexedDB, which allows File.WriteAllText and FileWriteAllBytes to work.

4

did you ever get this to work?

5

You can create and delete files. The files live in IndexedDB, a browser-based database. Pretty sure that existing files cannot be accessed on the file system.

6

Hello!

Browsers can’t access local files for security reasons, so the file you’re trying to open will need to be hosted using either a local or remote webserver.

I hope that helps!