dialog.h Example File
sysinfo/dialog.h

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    #ifndef DIALOG_H
    #define DIALOG_H

    #include <QDialog>
    #include <qsysteminfo.h>

    QTM_USE_NAMESPACE

    namespace Ui {
        class Dialog;
    }

    class Dialog : public QDialog {
        Q_OBJECT
    public:
        Dialog();
        ~Dialog();

    protected:
        void changeEvent(QEvent *e);

    private:
        Ui::Dialog *ui;
        void setupGeneral();
        void setupDevice();
        void setupDisplay();
        void setupStorage();
        void setupNetwork();
        void setupSaver();

        QSystemScreenSaver *saver;
        QSystemInfo *systemInfo;
        QSystemDeviceInfo *di;
        QSystemNetworkInfo *ni;

    private slots:
        void tabChanged(int index);
        void getVersion(int index);
        void getFeature(int index);
        void setSaverEnabled(bool b);
        void updateDeviceLockedState();

        void netStatusComboActivated(int);
        void updateBatteryStatus(int);
        void updatePowerState(QSystemDeviceInfo::PowerState);
        void displayBatteryStatus(QSystemDeviceInfo::BatteryStatus);
        void updateProfile(QSystemDeviceInfo::Profile);

         void displayNetworkStatus(QSystemNetworkInfo::NetworkStatus);
         void networkStatusChanged(QSystemNetworkInfo::NetworkMode, QSystemNetworkInfo::NetworkStatus);
         void networkSignalStrengthChanged(QSystemNetworkInfo::NetworkMode, int);
         void networkNameChanged(QSystemNetworkInfo::NetworkMode,const QString &);

    };

    #endif // DIALOG_H