How to determine which chromium version is used by QtWebEngine in Qt 5 at run-time?

user_1132686 0
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I couldn't find any function in Qt 5 to determine which chromium version is used by QtWebEngine.

I don't want to hard-code the chromium version in my code because I frequently update my application and the chromium version is usually changed in each version. And also Qt is backward-compatible and it is possible to update it without updating my application.

qtwebengine qt5 chromium qt
3 Answers

There is no direct solution but looking at the source code You can see that it is used to set the default user agent:

std::string ContentBrowserClientQt::getUserAgent()
{
    // Mention the Chromium version we're based on to get passed stupid UA-string-based feature detection (several WebRTC demos need this)
    return content::BuildUserAgentFromProduct("QtWebEngine/" QTWEBENGINECORE_VERSION_STR " Chrome/" CHROMIUM_VERSION);
}

So it can be extracted from that data:

QString version;
QString user_agent = QWebEngineProfile::defaultProfile()->httpUserAgent();
for(const QString & text : user_agent.split(" ")){
    if(text.startsWith(QStringLiteral("Chrome/"))){
        version = text.mid(QStringLiteral("Chrome/").length());
    }
}
qDebug().noquote()<< "Qt version:" << QT_VERSION_STR << "chromium version:" << version;

Output:

Qt version: 5.14.2 chromium version: 77.0.3865.129
user_66225870

You can use the runJavaScript method to show a dialog box with the navigator.userAgent Javascript variable, which includes the Chromium version:

QWebEngineView webView;
webView.page()->runJavaScript("alert(navigator.userAgent)");

In my case, the alert box says the following:

Mozilla/5.0 (Windows NT 6.2; Win64; x64) AppleWebKit/537.36 (KHTML, like Gecko) QtWebEngine/5.15.1 Chrome/80.0.3987.163 Safari/537.36

The interesting part for finding the Chromium version is Chrome/80.0.3987.163, which means that the Chromium version the Qt Web Engine is using is 80.0.3987.163.

user_42846270

If you run QT with the devtools allowed, you can get the chrome version inside the devtools that way :

navigator.appVersion.match(/.*Chrome\/([0-9\.]+)/)[1]

This solution comes from this stack overflow answer.

user_82548250
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