c++ - Print Preview in Qt -

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i want preview page or want have print preview. preview window opening contents of qt window not comming in it. code print preview follows:

void user::on_actionprintpreview_triggered() {     qprinter printer(qprinter::highresolution);     qprintpreviewdialog preview(&printer, this);     connect(&preview, signal(paintrequested(qprinter *)),             this, slot(print(qprinter *)));     preview.exec(); }  void user::print(qprinter *printer) {     // print page     qpainter painter(printer);     int w = printer->pagerect().width();     int h = printer->pagerect().height();     qrect page(0, 0, w, h);      qfont font = painter.font();     font.setpixelsize((w+h)/100);     painter.setfont(font);      painter.drawtext(page, qt::alignbottom | qt::alignright,                      qdatetime::currentdatetime().                      tostring(qt::defaultlocaleshortdate));      page.adjust(w/20, h/20, -w/20, -h/20); }

how can content of qt window in it. doing wrong. please me out solve this.

if want print contents of dialog or widget, print slot should like:

void user::print(qprinter * printer) {     qpainter painter(printer);     painter.setwindow(this->rect());     this->render(&painter); }

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