Extending QSettings to load / store Application settings - qt

Question

I'm trying to persist some application specific info in a settings file. Info like form size and position, the state of some check boxes on the main form etc. I trying to extend the QSettings class to do this.
This is what I have so far:
appsettings.h
class AppSettings : public QSettings
{
Q_OBJECT
public:
explicit AppSettings(QObject *parent = 0);
void load();
void save();
bool getLinkState();
bool getFullState();
void setLinkState(bool state);
void setFullState(bool state);
signals:
public slots:
private:
int mainTop;
int mainLeft;
int mainWidth;
int mainHeight;
bool cbFullState;
bool cbLinkState;
}
appsettings.cpp
#include "appsettings.h"
#include <QDebug>>
AppSettings::AppSettings(QObject *parent) :
QSettings(parent)
{
load();
}
void load(){
qDebug() << "appSettings load()"" ;
}
void save() {
qDebug() << "appSettings save()"" ;
}
bool getLinkState() {
return cbLinkState;
}
bool getFullState() {
return cbFullState;
}
void setLinkState(bool state)
{
if (state == cbLinkState) return;
cbLinkState = state;
save();
}
void setFullState(bool state)
{
if (state == cbFullState) return;
cbFullState = state;
save();
}
mainwindow.cpp
AppSettings *appSettings = AppSettings("MyOrgName", "MyAppName);
cbLink->setChecked( appSettings->getLinkState() );
I'm unsure how to:
1) create the object in the mainwindow such that the organsiation name and application name get passed through to QSettings that I've inherited from. I get a "no matching function" compile error on the first line in the mainwindow code above.
2) if I use the AppSettings class to store (cache) the info, how to create it only once and make it available from other windows and classes. For example, I may want to store the location of other windows as well as the main window.