Beginner error I'd need help with

[yessirsir]

Hello! I am just starting up with qt and c++
I have a small project to practice

I would like the QPushButton to append this string -> "text" inside the text box after I click it.

Clicking twice would result in having "texttext" and so on.

2016-06-11 19_13_39-mainwindow.ui - test - Qt Creator.jpg


I have these files so far:

test.pro:

QT       += core gui
greaterThan(QT_MAJOR_VERSION, 4): QT += widgets
TARGET = test
TEMPLATE = app
SOURCES += main.cpp\
    mainwindow.cpp
HEADERS  += mainwindow.h
FORMS    += mainwindow.ui

QT       += core gui
greaterThan(QT_MAJOR_VERSION, 4): QT += widgets
TARGET = test
TEMPLATE = app
SOURCES += main.cpp\
    mainwindow.cpp
HEADERS  += mainwindow.h
FORMS    += mainwindow.ui

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mainwindow.h :

class MainWindow : public QMainWindow
{
    Q_OBJECT
 
public:
    explicit MainWindow(QWidget *parent = 0);
    ~MainWindow();
 
private slots:
    void addTextToLabel();
 
private:
    Ui::MainWindow *ui;
};
 
#endif // MAINWINDOW_H

class MainWindow : public QMainWindow
{
    Q_OBJECT

public:
    explicit MainWindow(QWidget *parent = 0);
    ~MainWindow();

private slots:
    void addTextToLabel();

private:
    Ui::MainWindow *ui;
};

#endif // MAINWINDOW_H

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main.cpp:

#include "mainwindow.h"
#include <QApplication>
 
int main(int argc, char *argv[])
{
    QApplication a(argc, argv);
    MainWindow w;
    w.show();
 
    return a.exec();
}

#include "mainwindow.h"
#include <QApplication>

int main(int argc, char *argv[])
{
    QApplication a(argc, argv);
    MainWindow w;
    w.show();

    return a.exec();
}

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and mainwindow.cpp

#include "mainwindow.h"
#include "ui_mainwindow.h"
 
MainWindow::MainWindow(QWidget *parent) :
    QMainWindow(parent),
    ui(new Ui::MainWindow)
{
    ui->setupUi(this);
    connect(ui->pushButton, SIGNAL(clicked(bool)), this, SLOT(this-    >addTextToLabel()));
}
 
void MainWindow::addTextToLabel()
{
    ui->textEdit->setText(ui->textEdit->toPlainText() + "test");
}
 
MainWindow::~MainWindow()
{
    delete ui;
}

#include "mainwindow.h"
#include "ui_mainwindow.h"

MainWindow::MainWindow(QWidget *parent) :
    QMainWindow(parent),
    ui(new Ui::MainWindow)
{
    ui->setupUi(this);
    connect(ui->pushButton, SIGNAL(clicked(bool)), this, SLOT(this-    >addTextToLabel()));
}

void MainWindow::addTextToLabel()
{
    ui->textEdit->setText(ui->textEdit->toPlainText() + "test");
}

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

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but I am getting this error:

QObject::connect: No such slot MainWindow::this->addTextToLabel() in ..\test\mainwindow.cpp:10
QObject::connect:  (sender name:   'pushButton')
QObject::connect:  (receiver name: 'MainWindow')

QObject::connect: No such slot MainWindow::this->addTextToLabel() in ..\test\mainwindow.cpp:10
QObject::connect:  (sender name:   'pushButton')
QObject::connect:  (receiver name: 'MainWindow')

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I am not sure what I am doing wrong (very beginner)

Any one could help me out ?

---

Added after 18 minutes:

Someone helped figure it out

connect(ui->pushButton, SIGNAL(clicked(bool)), this, SLOT(addTextToLabel()));

[^NyAw^]

Hi,

This

connect(ui->pushButton, SIGNAL(clicked(bool)), this, SLOT(this-    >addTextToLabel()));

connect(ui->pushButton, SIGNAL(clicked(bool)), this, SLOT(this-    >addTextToLabel()));

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should be

connect(ui->pushButton, SIGNAL(clicked(bool)), this, SLOT(addTextToLabel()));

connect(ui->pushButton, SIGNAL(clicked(bool)), this, SLOT(addTextToLabel()));

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Please read how SIGNALS and SLOTS work first.

[anda_skoa]

Please read how SIGNALS and SLOTS work first.

The thread starter had actually already found out how it worked, see the edit

Cheers,
_

[^NyAw^]

Hi,

Ups! I have not noticed!