How does saving work in webgl

Does any1 know where is your save file located in webgl game.
Also is it possible to manually specifiy a save location in a webgl game

 

Thanks
Is it possible to save a file in a webserver and load it from there??

 

Hi,
I am using Unity 5.5.2f1 in a local server with Wamp in Windows 10 and I am trying to write a file constructed with the game stages; in Editor or Standalone build it is ok - I see the files created, but when build to webGL, no.
The debug.log for persistentDataPath is something like
/idbfs/5402568062381725d960ff2f031ec669/myFile.csv
but I can't find /idbfs even keeping system files as no hidden in the operating system.

I searched at IndexedDB/your_origin and there, there is only log files.
In c# code I used HandleIO.jslib and SyncFiles after close the file, as suggested in this forum.

There is also a emscripten working with the idbfs filesystem. I need to mount the filesystem in the jslib function?
Sorry, but I am a little confused.
Can someone give me one direction?

Thanks in advance

 

Thank you Marco-Trivellato.
Now, using your sync command, I can reopen the file from the IndexedDB and get the contentFile.

My next step is to send this file or content to the webserver - for test purposes, at localhost:8080/execWEB.
I create a results.txt inside execWEB project and sent a formWeb inside a coroutine in Unity:
IEnumerator uploadFile(string fileName, string contentFile)
{
WWWForm formData = new WWWForm ();
formData.AddField ("fileName", fileName);
formData.AddField ("fileContent", contentFile);

string loginURL = webProtocol + gameServerLocation + "/results.txt";
WWW w = new WWW (loginURL, formData);
yield return w;

if (w.error != null) {
Debug.Log ("w.error = " + w.error);
} else {
Debug.Log("w.text = " + w.text);
}
}

I am thinking that results.txt will be growing and I can write a crontab awk, on the server, to send each file to a database, but:
- results.txt is always 0 size;
- apache log shows "POST /execWEB/results.txt HTTP/1.1" 200 - (200 it is a good code);
- apache error log do not show something that looks my problem;
- w.error and w.text are empty.

What I am thinking or doing wrong? Can someone give me a direction?
Thanks in advance.

 

I'm unearthing this thread since, as of 2018.2.3, Application.ExternalEval is deprecated.

Code (CSharp):

1. [CS0618] `UnityEngine.Application.ExternalEval(string)' is obsolete:
2. `Application.ExternalEval is deprecated. See https//docs.unity3d.com/Manual/webgl-interactingwithbrowserscripting.html for alternatives.'

@Marco-Trivellato, is calling

Application.ExternalEval("_JS_FileSystem_Sync();");

still needed at all? Are there alternatives?

 

Rather than calling ExternalEval you would invoke it directly - see Interacting with browser scripting.

Code (CSharp):

1. [DllImport("__Internal")]
2. private static extern void JS_FileSystem_Sync();

then elsewhere in your code call it.

Code (CSharp):

1. private void SyncJS()
2. {
3.     JS_FileSystem_Sync();
4. }

I omitted the _ prefix since it looks like it is no longer present in FileSystem.js

 

@JJJohan thanks for your reply. Your solution gives me a

System.EntryPointNotFoundException: _JS_FileSystem_Sync

exception, whether I prefix the method name with an underscore or not...

 

Whoops - perhaps this method doesn't get compiled anymore, I'm not sure. What I use for my own project is my own jslib file which I can guarantee works, I just don't know if it's still the recommended way of doing it.

e.g. in your own jslib file:

Code (JavaScript):

1.  //put into Assets/Plugins/WebGL/HandleIO.jslib
2. var HandleIO = {
3.      SyncFiles : function()
4.      {
5.          FS.syncfs(false,function (err) {
6.              // handle callback
7.          });
8.      }
9. };
10. mergeInto(LibraryManager.library, HandleIO);

Paired with this in C#

Code (CSharp):

1. [DllImport("__Internal")]
2. private static extern void SyncFiles();

 

This works in 2023 and seems to be the ideal solution for me.