QT:4.1.1

Hello everybody,

I am trying to call a function by clicking on a item with the signal: itemClicked()
It happens nothing beim clicking on a item. Can somebody see what is wrong:

Qt Code: 
  1. MainWindow::MainWindow()
  2.  
  3.     {
  4.         ui.setupUi(this);
  5.  
  6.  
  7.         connect(ui.tabellen_cb, SIGNAL(currentIndexChanged (int)), this, SLOT(selectTable()));
  8.         connect(ui.actionverbinden, SIGNAL(triggered()), this, SLOT(openLoginDialog()));
  9.         connect(ui.actionNeu, SIGNAL(triggered()), this, SLOT(insertNewRow()));
  10.         connect(ui.abfrage_btn, SIGNAL(clicked()), this, SLOT(selectTable()));
  11.         connect(ui.new_btn, SIGNAL(clicked()), this, SLOT(insertNewRow()));
  12.         connect(ui.delete_btn, SIGNAL(clicked()), this, SLOT(deleteRow()));
  13.         connect(ui.abfrage_btn, SIGNAL(clicked()), this, SLOT(addItemsToTreeWidget()));
  14.  
  15.  
  16. 		QTreeWidgetItem *root = new QTreeWidgetItem(ui.tree);
  17. 		QTreeWidgetItem *tables = new QTreeWidgetItem(root);
  18.        	connect(ui.tree, SIGNAL(itemClicked (tables,0)), this, SLOT(selectTable()));
  19.  
  20.  
  21.         init();
  22.  
  23.     }
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Qt Code: 
  1. void MainWindow::selectTable()
  2. {
  3. 		/*
  4. 		QString table = ui.tabellen_cb->currentText();
  5. 		QSqlTableModel *model = new QSqlTableModel;
  6.         model->setTable(table);
  7.         //So kann man jeder Feld update: OnFiledChange
  8.         model->setEditStrategy(QSqlTableModel::OnFieldChange);
  9.         model->select();
  10.        
  11.  
  12.         ui.tableView->setModel(model);
  13.         ui.tableView->show();	
  14.         */
  15.         QTreeWidgetItem *root = new QTreeWidgetItem(ui.tree);
  16. 		root->setIcon(0, QIcon(QString::fromUtf8(":/images/images/database.jpg")));
  17. 		root->setText(0, "inventar");
  18.  
  19. 		QTreeWidgetItem *tables = new QTreeWidgetItem(root);
  20. 		tables->setIcon(0, QIcon(QString::fromUtf8(":/images/images/table.jpg")));
  21. 		tables->setText(0, "tabellen");
  22.         QString table = tables->text(0);
  23.         	QMessageBox::information(this,"",table);
  25.         model->setTable(table);
  26.         //So kann man jeder Feld update: OnFiledChange
  27.         model->setEditStrategy(QSqlTableModel::OnFieldChange);
  28.         model->select();
  29.  
  30.  
  31.         ui.tableView->setModel(model);
  32.         ui.tableView->show();	
  33.  
  34. }
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Qt Code: 
  1. void MainWindow::addItemsToTreeWidget()
  2. {
  3. 		ui.tree->clear();
  4. 		ui.tree->setObjectName(QLatin1String("ui.tree"));
  5.         ui.tree->setHeaderLabels(QStringList(tr("database")));
  6.        // ui.tree->header()->setResizeMode(QHeaderView::Stretch);
  7.  
  8. 		QTreeWidgetItem *root = new QTreeWidgetItem(ui.tree);
  9. 		root->setIcon(0, QIcon(QString::fromUtf8(":/images/images/database.jpg")));
  10. 		root->setText(0, "inventar");
  11.  
  12. 		QTreeWidgetItem *tables = new QTreeWidgetItem(root);
  13. 		tables->setIcon(0, QIcon(QString::fromUtf8(":/images/images/table.jpg")));
  14. 		tables->setText(0, "tabellen");
  15.  
  16. 	QSqlQuery select("select * from sysobjects where xtype = 'U' order by name");
  17. 	while(select.next())
  18. 	{
  19. 		QString tabelle = select.value(0).toString();
  20. 		//new QTreeWidgetItem(tables, tabelle, 0);
  21. 		QTreeWidgetItem *items = new QTreeWidgetItem(tables);
  22. 		items->setText(0, tabelle);
  23. 		items->setIcon(0, QIcon(QString::fromUtf8(":/images/images/table.jpg")));
  24.  
  25. 	}      
  26.  
  27. }
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