access selected value of QcomboBox has problem

[isan]

By using below code I can get seleted value in Qstring format.

Widget::Widget(QWidget *parent)
: QWidget(parent)
{
cbox = new QComboBox;
glayout = new QGridLayout(this);
glayout->addWidget(cbox);
QStringList list;
for(int i=0;i<31;i++){
list.append(QString::number(i));
}
cbox->addItems(list);
connect(cbox,SIGNAL(currentTextChanged(QString)),this,SLOT(SLTcurrentText(QString)));
}
 
void Widget:: SLTcurrentText(QString str){
qDebug()<<"CurrentText ::"<<str<<endl;
}

Widget::Widget(QWidget *parent)
: QWidget(parent)
{
cbox = new QComboBox;
glayout = new QGridLayout(this);
glayout->addWidget(cbox);
QStringList list;
for(int i=0;i<31;i++){
list.append(QString::number(i));
}
cbox->addItems(list);
connect(cbox,SIGNAL(currentTextChanged(QString)),this,SLOT(SLTcurrentText(QString)));
}

void Widget:: SLTcurrentText(QString str){
qDebug()<<"CurrentText ::"<<str<<endl;
}

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I should use SIGNAL(currentTextChanged(QString)
tnx..