QT QPrintPreviewDialog 当打印ＶＳ调试崩

Question

QT打印时，以VS调试启用，调用到打印时会崩溃，直接运行就不崩了，QT-5.15.2 VS2019
打印预览不崩，当点击右上角打印时，运行到slotPintPreview的histPainter.begin(printer)这一行就崩了。

QPrinter printer;
    printer.setOutputFormat(QPrinter::NativeFormat);
    printer.setPageSize(QPagedPaintDevice::A4);
    printer.setOrientation(QPrinter::Portrait);
    printer.printerName();//获取默认打印机
    printer.setNumCopies(1);
    printer.setPageOrder(QPrinter::FirstPageFirst);//设置打印顺序

    printer.setPageMargins(6, 6, 6, 6, QPrinter::Millimeter);
    printer.setPageSize(QPrinter::A4);
QPrintPreviewDialog* pPreviewDialog = new QPrintPreviewDialog(&printer);
        connect(pPreviewDialog, &QPrintPreviewDialog::paintRequested, this, &HistoryDataWin::slotPintPreview);//关联打印预览的内容
        pPreviewDialog->resize(1000, 900);
        pPreviewDialog->exec();
        delete pPreviewDialog;
        pPreviewDialog = nullptr;
  void HistoryDataWin::slotPintPreview(QPrinter* printer)
{
    QPainter histPainter;
    //printer->setPageSize(QPrinter::A4);
    int posPos = 0;
    int monitorPos = 0;
    histPainter.begin(printer);
    paintHist(&histPainter, posPos, monitorPos);
    histPainter.end();
}

Answer 1

我也遇到过同样的问题，是因为打印机的库没安装好。楼主可以从这个角度尝试下看能否解决。