QSettings

[wysota]

QSettings is initialised here :

ApplicationWindow::ApplicationWindow()
    : QMainWindow( 0 )
{   
  QCoreApplication::setOrganizationName("Adrien");
  QCoreApplication::setApplicationName("EFREI SMS");
  QSettings settings("efrei.ini", QSettings::IniFormat);

ApplicationWindow::ApplicationWindow()
    : QMainWindow( 0 )
{   
  QCoreApplication::setOrganizationName("Adrien");
  QCoreApplication::setApplicationName("EFREI SMS");
  QSettings settings("efrei.ini", QSettings::IniFormat);

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This is a local variable, not the member of the class.

If I declare in private :
QSettings settings("efrei.ini", QSettings::IniFormat);
instead of
QSettings settings;
the compiler does not accept it.

Of course, this would be invalid.
Try this:

QCoreApplication::setOrganizationName("Adrien"); // you should put that in main.cpp
  QCoreApplication::setApplicationName("EFREI SMS"); // and this too
//...
ApplicationWindow::ApplicationWindow()
    : QMainWindow( 0 ), settings("efrei.ini", QSettings::IniFormat)
{

QCoreApplication::setOrganizationName("Adrien"); // you should put that in main.cpp
  QCoreApplication::setApplicationName("EFREI SMS"); // and this too
//...
ApplicationWindow::ApplicationWindow()
    : QMainWindow( 0 ), settings("efrei.ini", QSettings::IniFormat)
{

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[incapacitant]

It works and I meet you I will ask for a brain transplant.