Qt5打印，却生成PDF文档

Question

在自己机器上运行好好的，打印预览都OK，但是打包后去别的机器上后，点击打印后，预览界面还是正常的，但是选择打印机那个标准提示框不见了，点击打印那个按钮，直接让我保存为PDF格式文件，怎么回事？？
电脑打印机可以使用，打印机也设置为默认了
void Print::printInfor(int n)
{
/* QPrinter printer( QPrinter::PrinterResolution );

 printer.setPageSize(QPrinter::A4);
 printer.setOrientation(QPrinter::Portrait);

 QPrintDialog dialog( &printer );
 if ( dialog.exec() )
 {
     qDebug("ERROR");
 }
 */
QPrinter printer(QPrinter::ScreenResolution);
QPrintPreviewDialog preview(&printer, this);
preview.setWindowState(Qt::WindowMaximized);

ui->stackedWidget->setCurrentIndex(n);  //打印“印刷生产订单”
connect(&preview, SIGNAL(paintRequested(QPrinter*)), SLOT(printPreview(QPrinter*)));
preview.exec();

}

void Print::Zhibiao_filePrintPreview()//治标
{
printInfor(2);
}

void Print::printPreview(QPrinter *printer)
{
QPainter painter(printer);
QPixmap image;
image = this->grab(QRect( QPoint( 0, 0 ), QSize( -1, -1 ) ));
//QPixmap image;
//image = image.grabWidget(this, 0, 0, 1005, 1283);
QRect rect = painter.viewport();
QSize size = image.size();
size.scale(rect.size(), Qt::KeepAspectRatio);//此处保证图片显示完整
painter.setViewport(rect.x(), rect.y(), size.width(), size.height());
painter.setWindow(image.rect());
painter.drawPixmap(0, 0, image);
}
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