[Qt-interest] QPrinter & QPainter

[Rick Vernam]

So I'm trying to print via qpainter.
If I go the route in the documentation it works just fine:

QPrinter printer;
printer.setPrinterName("xyz");
printer.setPaperSize(...);

QPainter painter(&printer);
painter.setRenderHint(QPainter::Antialiasing);
lblPreview->scene()->render(&painter);



However, I'd like to define a QPrinter & QPainter at the class level, then when 
I need to print, I want to just call QPainter::begin, set anti-aliasing & 
render.

I'm thinking I should be able to define the printer & the painter like so:

class ReceiveLoadDialog : public QDialog
{
Q_OBJECT
public:
	[ ... ]

private:
	[ ... ]
	QPrinter printer;
	QPainter painter;

	[ ... ]
};


Then in the class constructor, set up the printer:

ReceiveLoadDialog::ReceiveLoadDialog(...) : QDialog(parent)
{
	[ ... ]
	printer.setPrinterName("HPLJ4K");
	printer.setPaperSize(QSizeF(4.5,3.5), QPrinter::Inch);
	[ ... ]
}


Then, when I want to print:
(printLabel(bool) is a slot connected to a QPushButton::clicked(bool) signal)

void ReceiveLoadDialog::printLabel(bool)
{
	painter.begin(&printer);
	painter.setRenderHint(QPainter::Antialiasing);
	lblPreview->scene()->render(&painter);
	painter.end();
}


At the printer, I get nothing.  Not a blinking light, nothing.
Cups says everything is just fine - if I print a test page, it comes out just 
great.
So, I'm thinking it must be possible to do what I'm trying to do here - any 
ideas?
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