QPrintPreviewDialog不正确的预览

QPrintPreviewDialog

    QPrinter printer;
    printer.setResolution(QPrinter::HighResolution);
    printer.setPaperSize(QPrinter::A4);
    printer.setOrientation(QPrinter::Portrait);
    QPrintPreviewDialog *pd = new QPrintPreviewDialog(&printer);
    connect(pd,SIGNAL(paintRequested(QPrinter*)),this,SLOT(print(QPrinter*)));
    pd->exec();


void Class::print(QPrinter *p)
{
    QTextEdit *ted = new QTextEdit;
    ted->insertHtml(\"<center><img src=\'\"+QString(\":/img/logo.png\")+\"\' width=\'90\' height=\'72\'/><b><font size=\'9\'>Logo Text</font></b></center>\");
    ted->document()->print(p);
}