Использование таймера Опции

[fredwriter]

Здравствуйте, почему-то не компилируется код с испольльзованием таймера.

#include <QApplication>
#include <QtCore>
#include <QtGui>
 
 
    QString ping_Around;
    QStringList arguments;
    QStringList arguments1;
    QStringList arguments2;
    QStringList arguments3;
    QProcess myProcess;
    QProcess myProcess1;
    QProcess myProcess2;
    QProcess myProcess3;
    QStringList strlstPingResults;
    QStringList strlstPingResults1;
    QStringList strlstPingResults2;
    QStringList strlstPingResults3;
    QStringList Ss[4];
    QGraphicsTextItem* itemText[4];
    QString count_Pack[4];
    
    
class myClass : public QGraphicsScene {
    Q_OBJECT
public:
        myClass(QObject *parent = 0);
        QTimer *timer;
 
public slots:
  void timer_overflow();
  
private:
        QGraphicsEllipseItem *item;
};
 
 
void myClass::timer_overflow() {
    ping_Around = "/bin/ping";
    arguments << "-c" << "4" << "10.31.3.130";
    arguments1 << "-c" << "4" << "10.31.4.130";
    arguments2 << "-c" << "4" << "10.31.5.130";
    arguments3 << "-c" << "4" << "10.31.6.130";
    myProcess.start(ping_Around, arguments);
    myProcess.waitForFinished(4000);
    myProcess1.start(ping_Around, arguments1);
    myProcess1.waitForFinished(4000);
    myProcess2.start(ping_Around, arguments2);
    myProcess2.waitForFinished(4000);
    myProcess3.start(ping_Around, arguments3);
    myProcess3.waitForFinished(4000);
    
    strlstPingResults<<myProcess.readAll();
    Ss[0] = strlstPingResults[0].split('\n');
    strlstPingResults1<<myProcess1.readAll();
    Ss[1] = strlstPingResults1[0].split('\n');
    strlstPingResults2<<myProcess2.readAll();
    Ss[2] = strlstPingResults2[0].split('\n');
    strlstPingResults3<<myProcess3.readAll();
    Ss[3] = strlstPingResults3[0].split('\n');
    for (int i = 0; i < 4; i++) {
        if (Ss[i].count() > 1) {
            count_Pack[i] = Ss[i][7].mid(23, 1);
        }
    }
    this->setSceneRect(QRectF(-90, 0, 15, 15));
 
    for (int i = 0; i < 4; i++) {
        if (count_Pack[i].count() > 0) {
            if (count_Pack[i] == "4") {
                item = new QGraphicsEllipseItem(0, this);
                item->setRect(QRectF(-90, -40 + (i * 16), 15, 15));
                item->setBrush(QBrush(Qt::green));
            }
        }
        else {
            item = new QGraphicsEllipseItem(0, this);
            item->setRect(QRectF(-90, -40 + (i * 16), 15, 15));
            item->setBrush(QBrush(Qt::red));
        }
    }
}
 
 
myClass::myClass(QObject *parent): QGraphicsScene(parent)
{
    timer = new QTimer;
    QObject::connect(timer, SIGNAL(timeout()), this, SLOT(timer_overflow()));
    timer->start(16500);
//    ping_Around = "/bin/ping";
//    arguments << "-c" << "4" << "10.31.3.130";
//    arguments1 << "-c" << "4" << "10.31.4.130";
//    arguments2 << "-c" << "4" << "10.31.5.130";
//    arguments3 << "-c" << "4" << "10.31.6.130";
//    myProcess.start(ping_Around, arguments);
//    myProcess.waitForFinished(4000);
//    myProcess1.start(ping_Around, arguments1);
//    myProcess1.waitForFinished(4000);
//    myProcess2.start(ping_Around, arguments2);
//    myProcess2.waitForFinished(4000);
//    myProcess3.start(ping_Around, arguments3);
//    myProcess3.waitForFinished(4000);
//    
//    strlstPingResults<<myProcess.readAll();
//    Ss[0] = strlstPingResults[0].split('\n');
//    strlstPingResults1<<myProcess1.readAll();
//    Ss[1] = strlstPingResults1[0].split('\n');
//    strlstPingResults2<<myProcess2.readAll();
//    Ss[2] = strlstPingResults2[0].split('\n');
//    strlstPingResults3<<myProcess3.readAll();
//    Ss[3] = strlstPingResults3[0].split('\n');
//    for (int i = 0; i < 4; i++) {
//        if (Ss[i].count() > 1) {
//            count_Pack[i] = Ss[i][7].mid(23, 1);
//        }
//    }
//    this->setSceneRect(QRectF(-90, 0, 15, 15));
//
//    for (int i = 0; i < 4; i++) {
//        if (count_Pack[i].count() > 0) {
//            if (count_Pack[i] == "4") {
//                item = new QGraphicsEllipseItem(0, this);
//                item->setRect(QRectF(-90, -40 + (i * 16), 15, 15));
//                item->setBrush(QBrush(Qt::green));
//            }
//        }
//        else {
//            item = new QGraphicsEllipseItem(0, this);
//            item->setRect(QRectF(-90, -40 + (i * 16), 15, 15));
//            item->setBrush(QBrush(Qt::red));
//        }
//    }
    
}
 
 
int main(int argc, char *argv[]) {
    QApplication app(argc, argv);
    myClass m;
    QGraphicsView v(&m);
    v.setRenderHints(QPainter::Antialiasing);
    v.show();
    v.setGeometry(100, 100, 20, 100);
    return app.exec();
}

Это моя первая программа на Qt, с таймером еще не работал, по примеру сделал отсюда
Без таймера все работает отлично.
Вот вывод процесса сборки:
"/usr/bin/make" -f nbproject/Makefile-Debug.mk QMAKE=/usr/bin/qmake SUBPROJECTS= .build-conf
make[1]: Вход в каталог `/home/u0807/NetBeansProjects/QtApplication_2'
/usr/bin/qmake VPATH=. -o qttmp-Debug.mk nbproject/qt-Debug.pro
mv -f qttmp-Debug.mk nbproject/qt-Debug.mk
"/usr/bin/make" -f nbproject/qt-Debug.mk dist/Debug/GNU_1-Linux-x86/QtApplication_2
make[2]: Вход в каталог `/home/u0807/NetBeansProjects/QtApplication_2'
g++ -c -pipe -g -Wall -W -D_REENTRANT -DQT_GUI_LIB -DQT_CORE_LIB -DQT_SHARED -I/usr/share/qt4/mkspecs/linux-g++ -Inbproject -I/usr/include/qt4/QtCore -I/usr/include/qt4/QtGui -I/usr/include/qt4 -I. -Inbproject -I. -o build/Debug/GNU_1-Linux-x86/main.o main.cpp
g++ -o dist/Debug/GNU_1-Linux-x86/QtApplication_2 build/Debug/GNU_1-Linux-x86/main.o -L/usr/lib/i386-linux-gnu -lQtGui -lQtCore -lpthread
build/Debug/GNU_1-Linux-x86/main.o: In function `myClass::myClass(QObject*)':
/home/u0807/NetBeansProjects/QtApplication_2/main.cpp:91: undefined reference to `vtable for myClass'
build/Debug/GNU_1-Linux-x86/main.o: In function `myClass::~myClass()':
/home/u0807/NetBeansProjects/QtApplication_2/main.cpp:30: undefined reference to `vtable for myClass'
collect2: error: ld returned 1 exit status
make[2]: *** [dist/Debug/GNU_1-Linux-x86/QtApplication_2] Ошибка 1
make[2]: Выход из каталога `/home/u0807/NetBeansProjects/QtApplication_2'
make[1]: *** [.build-conf] Ошибка 2
make[1]: Выход из каталога `/home/u0807/NetBeansProjects/QtApplication_2'
make: *** [.build-impl] Ошибка 2

СОБРАТЬ FAILED (значение выхода 2,, общее время: 4s)