QSettings is a Qt class that provides an ability to store and use platform-independant settings for an application.
QSettings provides a very easy way to store, read and modify application settings in qt. Using this class is very simple.
The first thing to be done is creating an instance of QSettings. It gets 2 arguments which are the application's name, and the developer's company or organization. These are needed to name the settings files (on Unix-like systems) or the register branches (on Windows):
QSettings mySettings("myCompany","myAppName");
It is also possible to pre-set those values to get rid of the necessity of passing them every time a QSettings object is created. This can be done with QCoreApplication::setOrganizationName() and QCoreApplication::setApplicationName().
After a QSettings object is created, reading and writing settings is as easy as this:
//setting a value. The name should be QString, and the value can be a QVariant.
mySettings.setValue("valueName", "value");
//reading a value:
mySettings.value("vaueName");
The official Qt documentation can be found here for Qt 4.8 and here for Qt 5.
