html2.WebView fails on 4.2.1 [due to incomplete build]

wxPython Users
#1

While testing one of my applications with wxPython 4.2.1, I noticed that html2.WebView was failing. It previously worked fine using 4.2.0.

I checked version 4.2.1 of the wxPython demo and the HTML2_WebView example also fails.

I also checked the webview_sample.py script in the demo’s samples/html2/ directory and it too fails, with the same error that I get in my application. Here is the traceback:

richardt@Pavilion:~/.../wxPython-demo-4.2.1/samples/html2 $ python3 webview_sample.py 
Traceback (most recent call last):
  File "/home/richardt/Development/python/tools/wxpython/wxPython-demo-4.2.1/samples/html2/webview_sample.py", line 263, in <module>
    main()
  File "/home/richardt/Development/python/tools/wxpython/wxPython-demo-4.2.1/samples/html2/webview_sample.py", line 255, in main
    frm = SampleFrame(None)
  File "/home/richardt/Development/python/tools/wxpython/wxPython-demo-4.2.1/samples/html2/webview_sample.py", line 34, in __init__
    pnl = WebViewPanel(self, url)
  File "/home/richardt/Development/python/tools/wxpython/wxPython-demo-4.2.1/samples/html2/webview_sample.py", line 58, in __init__
    self.wv = webview.WebView.New(self)
NotImplementedError

[All testing done using Python 3.10.6 + wxPython 4.2.1 gtk3 (phoenix) wxWidgets 3.2.2.1 on Linux Mint 21.1].

Is there a different technique needed to use WebView in version 4.2.1 ?

#2

How did you install 4.2.1? Did you build it yourself or did you use one of the wheels from extras.wxpython.org?

#3

I used the following alias:

alias pip-upgrade-all='pip freeze --user | cut -d'\''='\'' -f1 | xargs -n1 pip install -U'

When it got to wxPython, as far as I can tell, it downloaded a .tar.gz file and built a wheel locally. There were no error messages and everything else in the apps I tested worked OK.

However, I have now just uninstalled that version and reinstalled using:

URL=https://extras.wxpython.org/wxPython4/extras/linux/gtk3/ubuntu-22.04
/usr/bin/python3 -m pip install -U -f $URL wxPython

And now the WebView examples are all working!

#4

Most likely what happened is that you don’t have the WebKit2 development packages installed, so in that case wxPython will just disable WebView support. On Debian-based systems, that package should be libwebkit2gtk-4.0-dev.

1 Like
#5

You were right, Scott. I just checked in Synaptic Package Manager and libwebkit2gtk-4.0-dev wasn’t installed.

Thanks for your help.

1 Like
#6

Hi all,
I run the same issue on Debian 12 with wxPython 4.2.1 and python 3.11, and this post didn’t solve it.

I installed from sources with the command :
pip wheel -v wxPython-4.2.1.tar.gz 2>&1 | tee build.log

In the build.log I got :

  checking what is the type of the fifth argument of getsockopt... socklen_t
  checking whether we have sockaddr_in6... yes
  configure: WARNING: Disabling wxWebRequest because no backends are available
  checking for linux/joystick.h... yes
  checking for XTST... yes
  checking for PRIVATE_FONTS... yes
.....
  checking for WEBKIT... yes
  checking for CAIRO... yes
  checking for cairo_push_group... yes
  checking for GST... configure: GStreamer 1.7.2+ not available. Not using GstPlayer and falling back to 1.0
  checking for GST... yes

libwebkit2gtk-4.0-dev is installed.
The wheel process of generation runs without error.

The same code is fine on wxPython 4.2.0.

Here is my code using WebView :

import wx.html2 as webview
…
self.wv = webview.WebView.New(self)

And the error occured :

    self.wv = webview.WebView.New(self)
              ^^^^^^^^^^^^^^^^^^^^^^^^^
NotImplementedError

Any help is welcome, thanks for reading.

#7

Problem solved but no idea on how I reached that.
Sorry for the disturbance.
Have a nice night :slight_smile: