Get clicked item from QListWidget and QTableWidget - c++

Question

I need to read an item from both QTableWidged and Q ListWidget as the user clicks on them.
For QListWidget I tried the solution described here, however the used SIGNAL itemClicked never seems to trigger.
For QTableWidget I tried multiple solutions, however they either didn't work or weren't what I need. Is there a simple solution for QTableWidget and am I just overlooking something with the solution provided for QListWidget?
Edit:
My Constructor of my MainWindow.cpp looks like this:
MainWindow::MainWindow(QWidget *parent) :
QMainWindow(parent),
ui(new Ui::MainWindow)
{
ui->setupUi(this);
ui->TableWidget->verticalHeader()->setVisible(true);
QTableWidget* table = ui->TableWidget;
connect(ui->listWidget, SIGNAL(itemClicked(QListWidgetItem*)),
this, SLOT(showBuchungsDetails(parseListWidgetBuchung(QListWidgetItem*))));
QHeaderView *header = qobject_cast<QTableView *>(table)->horizontalHeader();
connect(header, &QHeaderView::sectionClicked, [this](int logicalIndex){
QString text = ui->TableWidget->horizontalHeaderItem(logicalIndex)->text();
ui->lnBuchungsnummer->setText(text);
});
}
And here is my header file for MainWindow:
#ifndef MAINWINDOW_H
#define MAINWINDOW_H
#include <QMainWindow>
#include <QMessageBox>
#include <QFileDialog>
#include <QListWidget>
#include "TravelAgency.h"
namespace Ui {
class MainWindow;
}
class MainWindow : public QMainWindow
{
Q_OBJECT
public:
explicit MainWindow(QWidget *parent = nullptr);
~MainWindow();
private slots:
void on_actionDatei_einlesen_triggered();
void on_actionProgramm_beenden_triggered();
void on_actionBuchungen_anzeigen_triggered();
Customer* parseListWidgetBuchung(QListWidgetItem* item);
Customer* parseTableWidgetBuchung(QString item);
void showBuchungsDetails(Customer* c);
private:
Ui::MainWindow *ui;
TravelAgency travelagency{};
bool inputReady = false;
QStringList m_TableHeader;
};
#endif // MAINWINDOW_H
Edit 2:
I am using Qt Creator 4.8.2

Answer 1

Do not use the SLOT/SIGNAL syntax for C++ signals and slots. This is error prone, since mistakes like this are not caught during compilation. Your code compiles fine but doesn't work.
Use Qt5 connect syntax. In this case, you can use a lambda:
connect(ui->listWidget, &QListWidget::itemClicked, this, [this](QListWidgetItem* item)
{
showBuchungsDetails(parseListWidgetBuchung(item));
});

Answer 2

The connect call is wrong. If you use the SIGNAL - SLOT syntax, the slot must be a single function (it's a "reference" to the function).
You can do something like this:
connect(ui->listWidget, SIGNAL(itemClicked(QListWidgetItem*)),
this, SLOT(onItemClicked(QListWidgetItem*)));
And the onItemClicked implementation:
void MainWindow::onItemClicked(QListWidgetItem* item)
{
showBuchungsDetails(parseListWidgetBuchung(item));
}

Answer 3

Thanks for the suggestions, but I managed to sidestep the ´connect´ syntax completely by rightclicking on the widgeds in question on my UI window and use the "Go to slot..." functionality to create
void MainWindow::on_listWidget_itemClicked(QListWidgetItem *item)
{
parseListWidgetBuchung(item);
}
void MainWindow::on_TableWidget_cellClicked(int row, int column)
{
parseTableWidgetBuchung(ui->TableWidget->item(row, 0)->text());
}
which then allowed me to get the respective items. Either way, thanks again for the help!