pywebview没有显示任何东西

Question

我安装了这些库：

>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

我创建了一个包含以下内容的test.py :代码是：

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

我在Windows 10上，结果是一个空白页：屏幕

Answer 1

这里也一样。简言之：

显然，在pip安装的webview包目录(此处：c:/Users/<your_user>/AppData/Local/Packages/PythonSoftwareFoundation.Python.3.10_qbz5n2kfra8p0/LocalCache/local-packages/Python310/site-packages/webview/lib)中的c:/Users/<your_user>/AppData/Local/Packages/PythonSoftwareFoundation.Python.3.10_qbz5n2kfra8p0/LocalCache/local-packages/Python310/site-packages/webview/lib无法在这个目录中的arch子文件夹x64或x86中找到相应的WebView2Loader.dll。

找出您的Microsoft WebView2 Runtime (很可能是x64)的弓，然后将dll从相应的子目录中复制到上面。

这是怎么发现的？

在webview包中添加try/except块并添加CoreWebView2 (args.InitializationException)初始化失败的代码，edgechromium是webview的默认gui：

   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))

这引发错误(德语)，可以找到arg名称这里

[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'