Porting from QT4.6 to QT5

[Qt Enthusiast]

what is significance of FALSE and TRUE in Qt4

[Qt Enthusiast]

Also I am getting an error
mainwindow.h:17:0: error: "Q_NULLPTR" redefined [-Werror]

is Q_NULLPTR defined in SRC of QT5

[jsulm]

@Qt-Enthusiast Please post your code (mainwindow.h).
Also it is better to use nullptr from C++11 now.

[Qt Enthusiast]

@mrjj
is FALSE and TRUE defined in qt4 code

[JKSH]

@Qt-Enthusiast said in Porting from QT4.6 to QT5:

is FALSE and TRUE defined in qt4 code

No.

[Qt Enthusiast]

Then why I am getting this error when I am changing the library to Qt5

[jsulm]

@Qt-Enthusiast Do you use same compiler for both Qt versions?

[JKSH]

@Qt-Enthusiast said in Porting from QT4.6 to QT5:

Then why I am getting this error when I am changing the library to Qt5

Because you also changed your compiler?

[Qt Enthusiast]

@jsulm

Yes
I changed just the qt version. What is significance of Q_NULLPTR

[jsulm]

@Qt-Enthusiast Well, if you search a bit you will find this in Qt source:

#ifdef Q_COMPILER_NULLPTR
# define Q_NULLPTR         nullptr
#else
# define Q_NULLPTR         NULL
#endif

If you have a C++11 compiler Q_NULLPTR will be nullptr, else it will be the old C/C++ NULL.
You can use Q_NULLPTR if you have to support older C++ compilers which do not know anything about nullptr and newer C++ compilers.

[Qt Enthusiast]

how to solve the following error

error: no matching function for call to 'QGraphicsTextItem::QGraphicsTextItem(const char [5], int, QGraphicsScene*&)'
cursor = new QGraphicsTextItem("0, 0", 0, scene);

[jsulm]

@Qt-Enthusiast Go here and check what constructors QGraphicsTextItem has: http://doc.qt.io/qt-5/qgraphicstextitem.html

[Qt Enthusiast]

Hi
I saw
http://doc.qt.io/qt-5/qgraphicsscene.html

QGraphicsItem * itemAt(const QPointF &position, const QTransform &deviceTransform) const
QGraphicsItem * itemAt(qreal x, qreal y, const QTransform &deviceTransform) const

buit still could not find the correct fix for compliation error

What const QTransform &deviceTransform shall I use

error: no matching function for call to 'QGraphicsScene::itemAt(QPointF&)'
QPointF m ;
QGraphicsItem *currentItem = scene->itemAt(m);

[jsulm]

@Qt-Enthusiast http://doc.qt.io/qt-5/qgraphicsscene.html#itemAt has two parameters not one.
Try to pass QTransform() as second parameter.

[Qt Enthusiast]

I am getting issue

I am getting errors like

file.cxx: In member function 'bool fileMgr::showURL(QString)':
error: 'QWebView' does not name a type
340 static QWebView *sBrowser = NULL;
341 ^

I tried to do
#include QtWebKitWidgets
#include QtWebView

It is giving me an error that not able to find file QtWebKitWidgets .

can some one help me in solving the problem

[JKSH]

@Qt-Enthusiast said in Porting from QT4.6 to QT5:

It is giving me an error that not able to find file QtWebKitWidgets .

can some one help me in solving the problem

See https://forum.qt.io/topic/76739/webkit-status-2017

[Qt Enthusiast]

I am using solution

#include <QtWebKit/QtWebKit>
#include <QtWebKitWidgets/QtWebKitWidgets>

is that solution Ok

[jsulm]

@Qt-Enthusiast Why not simply

#include <QWebView>
```?

[JKSH]

@Qt-Enthusiast said in Porting from QT4.6 to QT5:

is that solution Ok

Did you read the link I gave you?

[Qt Enthusiast]

yesI read that from there only I found out and I wanted to confirm the same