Painter not active when exporting to pdf with different filename

I need to export multiple reports to pdf, but when I use the function QPrinter::setOutputFileName the error occurs:
QPainter::begin(): Returned false
QPainter::translate: Painter not active
QPainter::setPen: Painter not active
QPainter::setRenderHint: Painter must be active to set rendering hints

See the code:

Code:

---

for (int i = 0; model->rowCount() > i; i++)
{
    int x = model->data(model->index(i, 0), Qt::DisplayRole).toInt();
 
    QString filename = dir.append(QDir::separator()).append(model->data(model->index(i, 1), Qt::DisplayRole).toString()).append(".pdf");
 
    QPrinter * printer = new QPrinter(QPrinter::HighResolution);
    printer->setOutputFormat(QPrinter::PdfFormat);
    printer->setOrientation(QPrinter::Portrait);
    printer->setPaperSize(QSizeF(210, 297), QPrinter::Millimeter);
    printer->setFullPage(true);
    printer->setOutputFileName(filename);
 
    QPrintPreviewWidget * printPreview = new QPrintPreviewWidget(printer, this);
 
    Report * r = new Report(x, this);  // Report generation class
    connect(printPreview, SIGNAL(paintRequested(QPrinter*)), r, SLOT(Print(QPrinter*)));
 
    printPreview->print();
    disconnect(printPreview, SIGNAL(paintRequested(QPrinter*)), r, SLOT(Print(QPrinter*)));
}

---

If you remove the function "printer->setOutputFileName, will work, but will send directly to the printer. How can I solve this?

Thanks,

Marcelo E. Geyer

Well, you could start by making sure that file name is what you think it is, contains no illegal characters for a file name, and that the file can be written in the location specified.

Also these points are worth thinking about:

• You need not be using QDir::separator() for the reasons described in the documentation.
• The QPrinter need not be allocated on the heap; it only makes a memory leak at the moment.
• The QPrintPreviewWidget is totally unnecessary: just call the Print() function directly.
• IMHO "QSizeF(210, 297), QPrinter::Millimeter" is more obvious when expressed as QPrinter::A4.