QTableWidgetItem no text

[Santosh Reddy]

Hi FH

You have two problems in you code

1. You are inserting a new row in the table, this is ok, but you are setting the new items on the new row (which does not exists). You use dataTableWidget->rowCount() to insert row, and also to set items, dataTableWidget->rowCount() will give the latest row count, when you insert the a row, this will increase, which is the problem in your case.

2. You are setting the column count as 2, your column numbers are 0 & 1 (not 1 & 2), so you need to set item on column 0 and column 1

These will solve you Table problem. Below is modified code for your reference. I have added few more comments inline which will help you improve you code.

MainWindow::MainWindow(QWidget *parent) :
    QMainWindow(parent),
    ui(new Ui::MainWindow)
{
    ui->setupUi(this);
 
    dataTableWidget = new QTableWidget(this);
 
    //dataTableWidget->resize(243,250); //Not Required, if setCentralWidget(dataTableWidget);
    //dataTableWidget->move(25,180); //Not Required, if using setCentralWidget(dataTableWidget);
    dataTableWidget->setColumnCount(2);
    QStringList headers;
    headers << "Velocity" << "Time";
    dataTableWidget->setHorizontalHeaderLabels(headers);
    dataTableWidget->show(); //Remove, setCentralWidget(dataTableWidget);
    QString path = "C:/Data/TestScript.csv";
    QFile file(path);
 
    if (file.open(QIODevice::ReadOnly | QIODevice::Text)) //Modified
    {
        QTextStream in(&file);
        while (!in.atEnd())
        {
            int row = dataTableWidget->rowCount(); //Added
            dataTableWidget->insertRow(row); //Added, Insert a row, and set the items on same row
            qDebug()<<"rowNumber = " << row;
 
            QString line = in.readLine();
 
            int commaIndex = line.indexOf(",");
 
            QString velString = line.left(commaIndex);
            qDebug()<< "accString = " << velString;
 
            QString timeString = line.mid(commaIndex+1);
            qDebug()<< "timeString = " << timeString;
 
            QTableWidgetItem *newVelItem = new QTableWidgetItem;
            newVelItem->setText(velString);
            newVelItem->setTextColor("black");
            dataTableWidget->setItem(row, 0, newVelItem); //Modified, Column 0
            qDebug()<< "newVelItem = " << newVelItem->text();
 
            QTableWidgetItem *newTimeItem = new QTableWidgetItem;
            newTimeItem->setText(timeString);
            newTimeItem->setTextColor("black");
            dataTableWidget->setItem(row, 1, newTimeItem); //Modified, Column 1
            qDebug()<< "newTimeItem = " << newTimeItem->text();
        }
        //dataTableWidget->update(); //Not Required, as it will be updated when show() is called on MainWindow
        file.close(); //Added, just to close the open file
    }
 
    setCentralWidget(dataTableWidget); //Added, this does the layout magic
}

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

    dataTableWidget = new QTableWidget(this);

    //dataTableWidget->resize(243,250); //Not Required, if setCentralWidget(dataTableWidget);
    //dataTableWidget->move(25,180); //Not Required, if using setCentralWidget(dataTableWidget);
    dataTableWidget->setColumnCount(2);
    QStringList headers;
    headers << "Velocity" << "Time";
    dataTableWidget->setHorizontalHeaderLabels(headers);
    dataTableWidget->show(); //Remove, setCentralWidget(dataTableWidget);
    QString path = "C:/Data/TestScript.csv";
    QFile file(path);

    if (file.open(QIODevice::ReadOnly | QIODevice::Text)) //Modified
    {
        QTextStream in(&file);
        while (!in.atEnd())
        {
            int row = dataTableWidget->rowCount(); //Added
            dataTableWidget->insertRow(row); //Added, Insert a row, and set the items on same row
            qDebug()<<"rowNumber = " << row;

            QString line = in.readLine();

            int commaIndex = line.indexOf(",");

            QString velString = line.left(commaIndex);
            qDebug()<< "accString = " << velString;

            QString timeString = line.mid(commaIndex+1);
            qDebug()<< "timeString = " << timeString;

            QTableWidgetItem *newVelItem = new QTableWidgetItem;
            newVelItem->setText(velString);
            newVelItem->setTextColor("black");
            dataTableWidget->setItem(row, 0, newVelItem); //Modified, Column 0
            qDebug()<< "newVelItem = " << newVelItem->text();

            QTableWidgetItem *newTimeItem = new QTableWidgetItem;
            newTimeItem->setText(timeString);
            newTimeItem->setTextColor("black");
            dataTableWidget->setItem(row, 1, newTimeItem); //Modified, Column 1
            qDebug()<< "newTimeItem = " << newTimeItem->text();
        }
        //dataTableWidget->update(); //Not Required, as it will be updated when show() is called on MainWindow
        file.close(); //Added, just to close the open file
    }

    setCentralWidget(dataTableWidget); //Added, this does the layout magic
}

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