Solved QPrinter problem in Qt-5.13.0 with Xcode 10.3

[Spacehopper]

Hi

I've just resurrected a piece of software I wrote a couple of years ago. It worked back then under Qt-5.5 (I think). Now I'm getting error messages relating to "Unknown type name 'QPrinter'" under Qt-5.13.0.

Here is the code fragment with the error messages inserted alongside the code and preceded by an *:

...

#include <QPrinter>
#include <QPrinterInfo>

void MainWindow::printHints(Grid *p)
{
QPrinterInfo printer; *Unknown type name 'QPrinterInfo'
int row, col, n, bit;

if (printer.defaultPrinter().isNull()) {
statusBar()->showMessage(tr("No printer available."));
return;
}
QPrinter hints; *Unknown type name 'QPrinter'; did you mean 'QPainter'?
hints.setPageOrientation(QPageLayout::Landscape); *No member named 'setPageOrientation' in 'QPainter'

QFont printfont("courier", 10);
printfont.setFixedPitch(true);

QPainter painter;
painter.begin(&hints); *Cannot initialize a parameter of type 'QPaintDevice *' with an rvalue of type 'QPainter *'
...

Can anyone explain why QPrinter & QPrinterInfo are unknown types please?

[Spacehopper]

Ah ha!

Solved. I was using the wrong version of qmake to build the project.

All sorted now.

[SGaist]

Hi and welcome to devnet,

Do you have QT += printsupport in your .pro file ?

[Spacehopper]

@SGaist

Hi,

Yes:

...
QT += widgets
QT += printsupport
QT += gui
...

[Spacehopper]

Ah ha!

Solved. I was using the wrong version of qmake to build the project.

All sorted now.