QSettings(Qt 5.4): setValue doesn't work properly

Question

In my .cpp I'm using QSettings.
This worked before, in Qt 4.8:

#include <QSettings>


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QSettings settings;
settings.setValue("time_axis_direction", 1);
int test_var = settings.value("time_axis_direction").toInt();


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In test_var the program returns 0, what's the cause?
I used Qt with VS Add-In.

Answer 1

According to the docs, you have to set organization name and application name:

QCoreApplication::setOrganizationName("My Organization");
QCoreApplication::setApplicationName("My Application");
QSettings settings;

Or right in the constructor:

QSettings settings("My Organization", "My Application");

This will create HKCU\SOFTWARE\My Organization\My Application registry entry to store your settings (on Windows).

If QCoreApplication::setOrganizationName() and QCoreApplication::setApplicationName() has not been previously called, the QSettings object will not be able to read or write any settings, and status() will return AccessError.