Why does qprinter.abort() doesn't work in qt 5

Hello, everybody!
Please help with qprinter()
I'm sending 10 pages to printer, and I want to clear pending events to printer.
But printer.abort() doesn't work and its result is false;
what's problem?
maybe I need to connect additional libs or make some changes in .pro

there is a piece of my code:

Code:

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void AbortPrinter::on_pushButton_clicked()
{
    //to print
    if(dialog->exec() == QDialog::Accepted)
    {
        progressDialog->show();
        painter->begin(&printer);
        painter->setPen(Qt::white);
        for(int i=0;i<10;i++)
        {
            painter->drawText(50,50,tr("HELLO DUDE! X))"));
            if(i>0)
                    printer.newPage();
            qDebug()<<"pending Events: "<<qApp->hasPendingEvents();
            qApp->processEvents(QEventLoop::AllEvents);
            //if(qApp->hasPendingEvents()) - this version is also doesn't work correct
           if(b) //b is global bool to check aborted printers
           {
               painter->end();
               qDebug()<<"aborted: "<<b;
               break;
           }
        }
        painter->end();
    }
}
 
void AbortPrinter::on_pushButton_2_clicked()
{//to abort
    b = printer.abort();
}

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