Qt Cannot convert QPaintDevice to QImage

Question

This sounds like silly, but I cannot take a screenshot of a QwebView.

QImage image(view.page()->viewportSize(), QImage::Format_ARGB32);
QPainter painter;
painter.begin(image); // Here is the error. See below
view.page()->mainFrame()->render(&painter);
painter.end();
image.save("out.png");

And the error msg is,

mainwindow.cpp:115: error: no matching function for call to 'QPainter::begin(QImage&)'
candidate is bool QPainter::begin(QPaintDevice*)

What I know is ,QPaintDevice is the base of QPaint.

Answer 1

从错误中您需要通过指针传递image ：

painter.begin(&image);

Answer 2

The error message told you: the method begin requires a pointer to a drawing surface, and not a reference. Try doing:

painter.begin(&image);