How to take screen captures

rmam

I would like to use Qt's QWebEngine module to take screen captures from an URL. However, although the documentation section on QWebEnginePage lists QWebEnginePage::print and QWebEnginePage::printToPdf, it doesn't mention any way to save pages to image files.

Does anyone know if Qt's QWebEngine module can be used to take screen captures of websites?

JonB

@rmam
~~I would not have thought so.~~ Though I could be wrong. :)

mpergand

You need to render the webEngineView:

QSize size(1024,800);
view.resize(size);
QImage image(size, QImage::Format_ARGB32);
QPainter painter(&image);
 view->render(&painter);  // render the webEngineView
 painter.end();

From my experience, the raw result is not very good, need a blurr effect.

rmam

@mpergand thanks for the help. I've managed to get a minimal working example to run based on your code snippet.

However, it appears that this approach involves creating a window. Is it possible to take a screenshot without opening a window?

wolfgangr

Does anyone have a suggestion?
I have the very same problem: How do I render a QWebEngineView that has received content via QWebEngineView::setHtml().
I do not want to show the Widget.

Snippet:

QImage img(region_width, region_height, QImage::Format_ARGB32);
QWebEngineView* webEngineView = new QWebEngineView();
webEngineView->resize(region_width, region_height);
webEngineView->setStyleSheet("background:red");
QWebEnginePage* webEnginePage = webEngineView->page();
webEnginePage->settings()>setAttribute(QWebEngineSettings::ScreenCaptureEnabled, true);
webEngineView->setHtml("<p  style=\"background-color:#FFF067;color:green\"> TEXT</p>");
QPainter p(&img);
webEngineView->render(&p, QPoint(0, 0), QRegion(regionSize));
p.end();
img.save("img.png", "PNG", 80);

The result is always an entirely white image, regardless of the given background color, the <p> does not get rendered.