CODEWITHSUNDEEP
python-3.xpywebview
ViciniVicini
ViciniVicini

Reputation: 29

pywebview doesn't show anything

I installed these libraries:

>pip freeze | findstr pythonnet
pythonnet==3.0.0a2
>pip freeze | findstr clr-loader
clr-loader==0.1.7
>pip freeze | findstr pywebview
pywebview==3.6.3

And I created a test.py with this content: The code is:

import webview
webview.create_window('Hello world', 'https://pywebview.flowrl.com/')
webview.start()

I'm on Windows 10 and the result is a blank page: screen

Upvotes: 2

Views: 2511

Answers (1)

Mathias Menzel
Mathias Menzel

Reputation: 21

same here. In short:

Apparently the Microsoft.Web.WebView2.Core.dll in the pip installed packages directory of webview (here: c:/Users/<your_user>/AppData/Local/Packages/PythonSoftwareFoundation.Python.3.10_qbz5n2kfra8p0/LocalCache/local-packages/Python310/site-packages/webview/lib) cannot find the respective WebView2Loader.dll in the arch subfolders x64 or x86 in this very directory.

Find out the arch of your Microsoft WebView2 Runtime (most likely x64) and just copy the dll from the respective subdirectory one up.

How can that be found out?

Add try/except block and add code for unsuccessful initialization of CoreWebView2 (args.InitializationException) in edgechromium.py in the webview package, edgechromium is the default gui of the webview:

   def on_webview_ready(self, sender, args):
        try:
            logger.debug('### on_webview_ready')
            logger.debug('---> '+str(args.InitializationException))
            sender.CoreWebView2.NewWindowRequested += self.on_new_window_request
            settings = sender.CoreWebView2.Settings
            settings.AreDefaultContextMenusEnabled = _debug['mode']
            settings.AreDefaultScriptDialogsEnabled = True
            settings.AreDevToolsEnabled = _debug['mode']
            settings.IsBuiltInErrorPageEnabled = True
            settings.IsScriptEnabled = True
            settings.IsWebMessageEnabled = True
            settings.IsStatusBarEnabled = _debug['mode']
            settings.IsZoomControlEnabled = True

            if _user_agent:
                settings.UserAgent = _user_agent

            if self.html:
                sender.CoreWebView2.NavigateToString(self.html)

            logger.debug('-----------> '+str(sender.CoreWebView2))

        except Exception as e:
            logger.exception(str(e))

This throws the error (german), the arg name can be found here

[pywebview] ---> Die DLL "WebView2Loader.dll": Das angegebene Modul wurde nicht gefunden. (Ausnahme von HRESULT: 0x8007007E) kann nicht geladen werden.
   bei Microsoft.Web.WebView2.Core.CoreWebView2Environment.CreateCoreWebView2EnvironmentWithOptions(String browserExecutableFolder, String userDataFolder, ICoreWebView2EnvironmentOptions options, ICoreWebView2CreateCoreWebView2EnvironmentCompletedHandler en
vironment_created_handler)
   bei Microsoft.Web.WebView2.Core.CoreWebView2Environment.<CreateAsync>d__3.MoveNext()
--- Ende der Stapelüberwachung vom vorhergehenden Ort, an dem die Ausnahme ausgelöst wurde ---
   bei System.Runtime.ExceptionServices.ExceptionDispatchInfo.Throw()
   bei System.Runtime.CompilerServices.TaskAwaiter.HandleNonSuccessAndDebuggerNotification(Task task)
   bei Microsoft.Web.WebView2.WinForms.WebView2.<InitCoreWebView2Async>d__13.MoveNext()
[pywebview] 'NoneType' object has no attribute 'NewWindowRequested'
Traceback (most recent call last):
  File "C:\Users\<your_user>\AppData\Local\Packages\PythonSoftwareFoundation.Python.3.10_qbz5n2kfra8p0\LocalCache\local-packages\Python310\site-packages\webview\platforms\edgechromium.py", line 153, in on_webview_ready
    sender.CoreWebView2.NewWindowRequested += self.on_new_window_request
AttributeError: 'NoneType' object has no attribute 'NewWindowRequested'

Upvotes: 0

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