How do I get the text from a QTableView cell into a QlineEdit on click Qt5 C++

Question

So I have been trying all day to find a working example of how to retrieve the data from a QtableView into a lineEdit as a QString. I think I have tried every example code online and have had zero success, I can not even figure out how to pull the row and column numbers from the tableView. Everything I have tried fails and I get the error that index is a unused parameter. This has got to be something simple that I am missing but I have not used QT or done any C++ programing since version 3 and am completely baffled. mainWindow.cpp is below. Thanks in advance for any help you can give me. BTW everything works fine except for the clicked slot.

#include <QDebug>
#include <QAbstractTableModel>
#include <QModelIndex>

MainWindow::MainWindow(QWidget *parent)
    : QMainWindow(parent)
    , ui(new Ui::MainWindow)
{
    ui->setupUi(this);

    ui->setupUi(this);

    // Create a data model for the mapping table from a CSV file
    csvModel = new QStandardItemModel(this);
    csvModel->setColumnCount(2);
    //csvModel->setHorizontalHeaderLabels(QStringList() << "Name" << "Number");
    ui->tableView->setModel(csvModel);

    // Open the file 
    QFile file("/home/foo.csv");
    if ( !file.open(QFile::ReadOnly | QFile::Text) ) {
        qDebug() << "File not exists";
    } else {
        // Create a thread to retrieve data from a file
        QTextStream in(&file);
        //Read to end
        while (!in.atEnd())
        {
            QString line = in.readLine();
            QList<QStandardItem *> standardItemsList;
            for (QString item : line.split(",")) {
                standardItemsList.append(new QStandardItem(item));
            }
            csvModel->insertRow(csvModel->rowCount(), standardItemsList);
        }
        file.close();
    }

}

MainWindow::~MainWindow()
{
    delete ui;
}



void MainWindow::on_tableView_clicked(const QModelIndex &index)
{
   qDebug() << "test";

}

Header code below

#ifndef MAINWINDOW_H
#define MAINWINDOW_H

#include <QMainWindow>
#include <QStandardItemModel>

QT_BEGIN_NAMESPACE
namespace Ui { class MainWindow; }
QT_END_NAMESPACE

class MainWindow : public QMainWindow
{
    Q_OBJECT

public:
    MainWindow(QWidget *parent = nullptr);
    ~MainWindow();

private slots:
    void on_tableView_clicked(const QModelIndex &index);

private:
    Ui::MainWindow *ui;
    QStandardItemModel *csvModel;
};
#endif // MAINWINDOW_H

Answer 1

I think this is just a basic misunderstanding with regard to how signals/slots operate. Unless you're using the auto connect feature you need to manually connect a signal to a slot using one of the QObject::connect overloads. So in your constructor you need something like...

connect(ui->tableView, &QTableView::clicked, this, &MainWindow::[on_tableView_clicked);