@SGaist said in Application crahes on QWebEnginePage printing attempt:

checking that the call to page returns a valid pointer.

Thank you.

With the clue I had from this response, and with the help of demobrowser example which is bundled with Qt-5.6 I rewrote the code and could send the page to printer successfully.

the code after the modification:

QWebEngineView *view = new QWebEngineView(this); view->setHtml("<h1>Hello</h1>", QUrl("about:blank")); printRequest(view->page());

the functions are defined as following

void MainWindow::slotHandlePagePrinted(bool result) { Q_UNUSED(result); delete printer; printer = nullptr; } void MainWindow::printRequest(QWebEnginePage *page) { if (printer) return; printer = new QPrinter(); QScopedPointer<QPrintDialog> dialog(new QPrintDialog(printer, this)); if (dialog->exec() != QDialog::Accepted) { slotHandlePagePrinted(true); return; } else { page->print(printer, [=](bool) {}); } }

and in the header file:

private slots: void slotHandlePagePrinted(bool result); private: QPrinter *printer; void printRequest(QWebEnginePage *page);

Finally. This code works fine.

void onPrint(QPrinter* printer) { QPagedPaintDevice* device = printer; QPainter painter; painter.begin(device); int w = device->width(); int h = device->height(); painter.drawLine(0,0,w,h); painter.drawLine(0,h,w,0); painter.drawEllipse(QPointF(w/2, h/2), w/10, w/10); painter.drawText(0, h, "pixels"); printer->newPage(); painter.end(); }

Well this problem with garbled Helvetica in printed output (see images in prior post) is fixed if we DISABLE font embedding ... with this:

void QPrinter::setFontEmbeddingEnabled(bool enable)

Two questions:

(1) Does that given any insight into the problem we are having? (This is with Qt 5.5.1).
(2) How reasonable is it to DISABLE font embedding? Will that cause any problems for our users?

Thanks in advance.

Hi! My first thought was to use the PDF generation that Qt offers and then simply convert the produced documents to PDF/A with Ghostscript. That should go like gs -dPDFA ....

You can find an example of this in the "Advanced Qt Programming: Creating Great Software with C++ and Qt 4" book code samples.

You should check the C++ API for that. You can use Qt with native API (check the QtWinExtras module)

Hi and welcome to devnet,

Where is that library located ?

@Chris-Kawa Thanks :)