<html xmlns:v="urn:schemas-microsoft-com:vml" xmlns:o="urn:schemas-microsoft-com:office:office" xmlns:w="urn:schemas-microsoft-com:office:word" xmlns:m="http://schemas.microsoft.com/office/2004/12/omml" xmlns="http://www.w3.org/TR/REC-html40">
<head>
<meta http-equiv="Content-Type" content="text/html; charset=us-ascii">
<meta name="Generator" content="Microsoft Word 15 (filtered medium)">
<style><!--
/* Font Definitions */
@font-face
{font-family:"Cambria Math";
panose-1:2 4 5 3 5 4 6 3 2 4;}
@font-face
{font-family:Calibri;
panose-1:2 15 5 2 2 2 4 3 2 4;}
/* Style Definitions */
p.MsoNormal, li.MsoNormal, div.MsoNormal
{margin:0in;
font-size:11.0pt;
font-family:"Calibri",sans-serif;
mso-fareast-language:EN-US;}
a:link, span.MsoHyperlink
{mso-style-priority:99;
color:#0563C1;
text-decoration:underline;}
span.EmailStyle19
{mso-style-type:personal-reply;
font-family:"Calibri",sans-serif;
color:windowtext;}
.MsoChpDefault
{mso-style-type:export-only;
font-size:10.0pt;}
@page WordSection1
{size:8.5in 11.0in;
margin:1.0in 1.0in 1.0in 1.0in;}
div.WordSection1
{page:WordSection1;}
--></style><!--[if gte mso 9]><xml>
<o:shapedefaults v:ext="edit" spidmax="1026" />
</xml><![endif]--><!--[if gte mso 9]><xml>
<o:shapelayout v:ext="edit">
<o:idmap v:ext="edit" data="1" />
</o:shapelayout></xml><![endif]-->
</head>
<body lang="FR" link="#0563C1" vlink="#954F72" style="word-wrap:break-word">
<div class="WordSection1">
<p class="MsoNormal">Hi,<span lang="EN-US"><o:p></o:p></span></p>
<p class="MsoNormal"><span lang="EN-US"><o:p> </o:p></span></p>
<p class="MsoNormal"><span lang="EN-US">In some cases, it is not possible to import QtWebEngineWidgets before a QCoreApplication instance is created. In that case, Qt provides an alternative by setting Qt::AA_ShareOpenGLContexts attribute (QT doc for reference:
<a href="https://doc.qt.io/qt-5/qtwebengine.html">https://doc.qt.io/qt-5/qtwebengine.html</a>). However, PyQtWebEngine currently only check in the PreInitialisationCode if a QCoreApplication instance has been created and throw the following error if that’s
the case :<o:p></o:p></span></p>
<p class="MsoNormal"><span lang="EN-US"><o:p> </o:p></span></p>
<p class="MsoNormal"><span lang="EN-US">ImportError "QtWebEngineWidgets must be imported before a QCoreApplication instance is created"<o:p></o:p></span></p>
<p class="MsoNormal"><span lang="EN-US"><o:p> </o:p></span></p>
<p class="MsoNormal"><span lang="EN-US"><o:p> </o:p></span></p>
<p class="MsoNormal"><span lang="EN-US"><o:p> </o:p></span></p>
<p class="MsoNormal"><span lang="EN-US">Proposed solution :<o:p></o:p></span></p>
<p class="MsoNormal"><span lang="EN-US"><o:p> </o:p></span></p>
<p class="MsoNormal"><span lang="EN-US">Adding the following check in PyQtWebEngine\sip\QtWebEngineWidgets\<b>qwebengineview.sip
</b>(from line 194) solved this problem for me :<o:p></o:p></span></p>
<p class="MsoNormal"><span lang="EN-US"><o:p> </o:p></span></p>
<p class="MsoNormal"><span lang="EN-US"><o:p> </o:p></span></p>
<p class="MsoNormal"><span lang="EN-US" style="background:silver;mso-highlight:silver">%PreInitialisationCode<o:p></o:p></span></p>
<p class="MsoNormal"><span lang="EN-US" style="background:silver;mso-highlight:silver">// QtWebEngineWidgets uses Q_COREAPP_STARTUP_FUNCTION so, in order to make sure<o:p></o:p></span></p>
<p class="MsoNormal"><span lang="EN-US" style="background:silver;mso-highlight:silver">// things work (particularly on Windows) when we dynamically load the code, we<o:p></o:p></span></p>
<p class="MsoNormal"><span lang="EN-US" style="background:silver;mso-highlight:silver">// check things have been done in the right order.<o:p></o:p></span></p>
<p class="MsoNormal"><span lang="EN-US" style="background:silver;mso-highlight:silver">if (QCoreApplication::instance())<o:p></o:p></span></p>
<p class="MsoNormal"><span lang="EN-US" style="background:silver;mso-highlight:silver">{<o:p></o:p></span></p>
<p class="MsoNormal" style="margin-left:35.4pt"><span lang="EN-US" style="background:yellow;mso-highlight:yellow">if (!QCoreApplication::testAttribute(Qt::AA_ShareOpenGLContexts))<o:p></o:p></span></p>
<p class="MsoNormal" style="margin-left:35.4pt"><span lang="EN-US" style="background:silver;mso-highlight:silver">{<o:p></o:p></span></p>
<p class="MsoNormal" style="margin-left:35.4pt"><span lang="EN-US" style="background:silver;mso-highlight:silver"> PyErr_SetString(PyExc_ImportError,"QtWebEngineWidgets must be imported or Qt::AA_ShareOpenGLContexts must be set before a QCoreApplication instance
is created");<o:p></o:p></span></p>
<p class="MsoNormal" style="margin-left:35.4pt"><span lang="EN-US" style="background:silver;mso-highlight:silver"> SIP_MODULE_RETURN(NULL);<o:p></o:p></span></p>
<p class="MsoNormal" style="margin-left:35.4pt"><span lang="EN-US" style="background:silver;mso-highlight:silver">}<o:p></o:p></span></p>
<p class="MsoNormal"><span lang="EN-US" style="background:silver;mso-highlight:silver">}<o:p></o:p></span></p>
<p class="MsoNormal"><span lang="EN-US" style="background:silver;mso-highlight:silver">%End</span><span lang="EN-US"><o:p></o:p></span></p>
<p class="MsoNormal"><span lang="EN-US"><o:p> </o:p></span></p>
<p class="MsoNormal"><span lang="EN-US">I tested this solution with PyQtWebEngine 5.15.5 on windows 11 and this works as expected in my use case. The problem is most likely the same with PyQt6-WebEngine 6.2.1 as QtWebEngineWidgets works the same way in QT 6
but I have not been able to test with this version.<o:p></o:p></span></p>
<p class="MsoNormal"><span lang="EN-US"><o:p> </o:p></span></p>
<p class="MsoNormal"><span lang="EN-US">Best,<o:p></o:p></span></p>
<p class="MsoNormal"><span lang="EN-US"><o:p> </o:p></span></p>
<p class="MsoNormal"><span lang="EN-US">Jean-Baptiste Peter<o:p></o:p></span></p>
</div>
</body>
</html>