Printing contents of entire QGraphicscene

[A Former User]

I m using a subclass of QGraphicscene i.e class 'a' which has a public member QGraphicsview *view.
I want to print the entire scene and not the view.
I tried
QPrinter printer;
if (QPrintDialog(&printer).exec() == QDialog::Accepted)
{
QPainter painter(&printer);
painter.setRenderHint(QPainter::Antialiasing);
a->render(&painter);
}
but it is printing blank page.
How do i go about this?Please help!