Top "Qtcore" questions

QString replace only first occurrence

Is there simple way of replacing only first occurrence of some substring by other substring in QString? It can be …

c++ qt qstring qtcore

How to use qSort with custom types in QList?

I have a problem with sorting a QList containing instances of a struct: class modelHeuristic { typedef struct { QString c; QString …

c++ qt sorting qtcore qlist

Difference between QObject::connect vs connect methods

I am a newbie with Qt. Most of the times Qt developers need to use signals and slots for object …

c++ qt qobject qtcore qt-signals

How can I update the value of QHash for a specific key?

I am using QHash in C++ to store some simple key and value pairs. In my case the key is …

c++ qt qtcore qhash

How to Compress Slot Calls When Using Queued Connection in Qt?

After reading some articles like this about Qt Signal-Slot communications I still have a question concerning the queued connection. If …

c++ qt qthread qtcore qt-signals

is there a method to check if a QJsonObject object contains specific attribute?

there is a QJsonObject { "a":"...", "b":"...", "c":"..." } is there a method to check if this object contains "a"?

c++ json qt qtcore qjsonobject

'QObject' is an ambiguous base of 'Recorder'

I'm trying to use QTimer, which inherits QObject, in my newly created class. However I try it I keep getting …

c++ qt qthread qtcore qobject

Qt list.clear() does it destroy the object's?

Let's say I have the following list: QList<Type*> list; list.add(new Type()); list.add(new Type()); …

c++ qt qtcore qlist

How to detect Windows shutdown or logoff in Qt

I am porting a Linux app to Windows written in Qt. The application needs to save some settings before closing. …

c++ windows qt qt-signals qtcore

From QVariant to Integer and String

The user's entered value can be both: a string or an integer. QAbstractTableModel's setData() method always gets this value as …

c++ qt pyqt qtcore qvariant