Qt生成PDF

void MainWindow::exportPdf()
{
       QTextEdit *textEdit = new QTextEdit(this);
       textEdit->setGeometry(0,0,800,480);
       textEdit->setText("helloworld");
       QString fileName = QFileDialog::getSaveFileName(this,"Export PDF",QString(),"*.pdf");
       if(!fileName.isEmpty())
       {
            if(QFileInfo(fileName).suffix().isEmpty())
            {
                fileName.append(".pdf");
             }
             QPrinter  printer(QPrinter::HighResolution);
             printer.setOutputFormat(QPrinter::PdfFormat);
             printer.setOutputFileName(fileName);
             textEdit->document()->print(&printer);
        }
}