How do you add slots?

[victor.fernandez]

In the MainWindow.ui i have a cancel button (no problem with, because i added a close() slot with gui), but if i want to add a myFunction to other button??

You would need to subclass the button in order to add a method. However, you normally don't need to, since you can just add myFunction to MainWindow and connect the clicked() signal to your slot.

/home/maurelio/pgm/qt-sdk/esercizi/FirstGui/mainwindow.h:21: error: ISO C++ forbids declaration of ‘connectAction’ with no type

This error usually happens when you forget to add an #include for the class. However, I don't think connectAction is a class but I guess it's an object, so you probably forgot to specify the class name. e.g.:

...
public slots:
    void connectNet();
 
private:
    QAction *connectAction;
...

...
public slots:
    void connectNet();

private:
    QAction *connectAction;
...

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/home/maurelio/pgm/qt-sdk/esercizi/FirstGui/mainwindow.cpp:9: error: ‘connectButton’ was not declared in this scope

This means there's no such connectButton in MainWindow. If you added it in Qt Designer, you would have to use ui->connectButton instead. You could make MainWindow a subclass of Ui::MainWindow. This way you could directly access connectButton without needing to add "ui->".

#ifndef MAINWINDOW_H
#define MAINWINDOW_H
 
#include <QMainWindow>
#include <QtNetwork>
#include "ui_mainwindow.h" 
 
class MainWindow : public QMainWindow, private Ui::MainWindow
{
    Q_OBJECT
 
public:
    MainWindow(QWidget *parent = 0);
 
public slots:
    void connectNet();
};
 
#endif // MAINWINDOW_H

#ifndef MAINWINDOW_H
#define MAINWINDOW_H
 
#include <QMainWindow>
#include <QtNetwork>
#include "ui_mainwindow.h" 
 
class MainWindow : public QMainWindow, private Ui::MainWindow
{
    Q_OBJECT
 
public:
    MainWindow(QWidget *parent = 0);
   
public slots:
    void connectNet();
};
 
#endif // MAINWINDOW_H

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#include <QtGui>
#include "mainwindow.h"
 
MainWindow::MainWindow(QWidget *parent)
 : QMainWindow(parent)
{
    setupUi(this);
 
    connect(connectButton, SIGNAL(clicked()), this, SLOT(connectNet()));
}
 
void MainWindow::connectNet()
{
    //Some Stuff;
}

#include <QtGui>
#include "mainwindow.h"
 
MainWindow::MainWindow(QWidget *parent)
 : QMainWindow(parent)
{
    setupUi(this);

    connect(connectButton, SIGNAL(clicked()), this, SLOT(connectNet()));
}
 
void MainWindow::connectNet()
{
    //Some Stuff;
}

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