QBoxLayout is not shown properly

[sankarapandiyan]

I tried to create a some textedit and pushbutton in layout without using UI . But i have received the plain latout at the End and i have these type of Error .

QWidget::setLayout: Attempting to set QLayout "" on MainWindow "MainWindow", which already has a layout
QObject::connect: Parentheses expected, slot MainWindow::writetoFile in ../serial_mannualselct/mainwindow.cpp:34
QObject::connect: (receiver name: 'MainWindow')

MainWindow::MainWindow(QWidget *parent)
    : QMainWindow(parent)
    , ui(new Ui::MainWindow)
{
    ui->setupUi(this);
    setWindowTitle("TITLE");
    cBox  = new QComboBox;
    Save   = new QPushButton;
    SBox   = new QSpinBox;
    tEdit = new QTextEdit;
    Hlay  = new QHBoxLayout;

    cBox->addItem("First");
    cBox->addItem("Second");
    cBox->addItem("third");
    Save->setText("save");

    Hlay->addWidget(SBox);
    Hlay->addWidget(tEdit);
    Hlay->addWidget(cBox);
    Hlay->addWidget(Save);
    setLayout(Hlay);

    MainWindow::connect(Save, SIGNAL(clicked()), this, SLOT (writetoFile));// I think here there is a problem 
}

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

void MainWindow::writetoFile(){
    QString fname = "/home/adx-soft1/Shankar/serial_mannualselct/file.txt";
    QFile file(fname);
    if (file.open(QIODevice::WriteOnly | QIODevice::Text)) {
        QTextStream stream(&file);
        QString textFromSpin = QString::number(SBox->value());
        QString textFromBox  = tEdit->toPlainText();
        QString textFromCombo= cBox->currentText();
       stream << "Spinner value"    << endl ;
       stream << "TEXT FROM BOX"    << endl ;
       stream << "TEXT FROM COMBO"  << endl 


    file.close();
    }

[SGaist]

Hi,

QMainWindow already has a layout, the one that manages the docked widgets, tool bars, etc.

Put your stuff inside a plain QWidget and use it as central widget.