Crash when using SetVirtualHostMapping

[ydev0927]

Description

Crash when using SetVirtualHostMapping

Version
SDK: com.microsoft.mixedreality.webview.unity-0.17.1-pre.3.tgz
Runtime: Unity2020.3.33
Framework: Unity2020.3.33, MRTK2.8.3
OS: (Unity Editor) Windows 10 22H2, (Hololens2) 22621.1120.arm64fre.ni_release_svc_sydney_rel_prod.230707-1012

Regression
Was this working before but has regressed? > No.
If yes, what version did this last work on?

Repro Steps

1. Clone this repository.
   https://github.com/MicrosoftEdge/WebView2Samples/
2. Resolve compilation errors
   • Do "Restore Features" in Mixed Reality Feature Tool.
   • remove this line from package.json

     "com.unity.collab-proxy": "2.0.3",
     

3. Open this sample in UnityEditor.
   https://github.com/MicrosoftEdge/WebView2Samples/tree/main/GettingStartedGuides/HoloLens2_GettingStarted/HoloLens2GetStartedApp
4. Attach this script to "WebView"

using Microsoft.MixedReality.WebView;
using System;
using UnityEngine;

public class WebViewExample : MonoBehaviour
{
    private void Start()
    {
        var webViewComponent = gameObject.GetComponent<WebView>();

        webViewComponent.GetWebViewWhenReady((IWebView webView) =>
        {
            ((IWithVirtualHost)webView).SetVirtualHostMapping("webview2.sample", "Assets\\Html");

            // Navigate to our local content.
            // webViewComponent.Load(new Uri("http://webview2.sample/demo.html")); // comment out!!
        });
    }
}

source: https://learn.microsoft.com/en-us/microsoft-edge/webview2/get-started/hololens2#setvirtualhostnametofoldermapping-and-setvirtualhostmapping

6. And create a "{ProjectFolder}/Assets/Html/demo.html". (I don't think it matters)

7. When I run it, it crashes. (Both Editor and Hololens.)

Screenshots

Additional context

AB#45688087

[LiangTheDev]

@ydev0927 could you share more details about the crash? Like the exception info, stack of the crash, or the dump file?

[ydev0927]

@LiangTheDev There is no log by "Application.logMessageReceivedThreaded". I have crashdmp from Hololens2 DevicePortal, but filesize is 576MB. What should i do?

[LiangTheDev]

Could you zip the dump file, upload it to some network/cloud drive and share the link with me at lzhao@microsoft.com?

[ydev0927]

@LiangTheDev Okay. I shared a file with you via GoogleDrive.
WebView2HoloLensSample.exe.6528.dmp

[LiangTheDev]

The error was 0x80070003 (The system cannot find the path specified.), which indicate that there is no "Assets\Html" sub folder in the directory where the app exe file is in. If you run the app under debugger, there should be some debug message indicating this. It is likely that the app package doesn't carry the assets\html files as expected. Try to verify that the VS project builds the package with those files.

[ydev0927]

@LiangTheDev Thanks for the analysis.
It worked fine when I placed the "Html" directory under the StreamingAssets directory and referenced it with an absolute path.
It would be nice to be fixed to throw an exception if the directory doesn't exist.

• move directory

{ProjectFolder}/Assets/Html
↓
{ProjectFolder}/Assets/StreamingAssets/Html

• change source code

        webViewComponent.GetWebViewWhenReady((IWebView webView) =>
        {
            ((IWithVirtualHost)webView).SetVirtualHostMapping("webview2.sample", System.IO.Path.Combine(Application.streamingAssetsPath, "Html"));

            // Navigate to our local content.
            webViewComponent.Load(new Uri("http://webview2.sample/demo.html"));
        });

[LiangTheDev]

If you put a try-catch around the call to SetVirtualHostMapping, would it catch the error as an exception or still crash the application?

[ydev0927]

crash.

[champnic]

@michaelfarnsworth Would you be able to help here? Sounds like when the SetVirtualHostMapping is called with an invalid path it causes an exception and crash that is not exposed or try-catch-able by the app.

[michaelfarnsworth]

@champnic I'll take a look.