How to create custom slot in Qt Designer 4.1?

[jacek]

I mean that I press my helloButton but no QMessageBox appears.

You don't instatiate your class anywhere.

Try:

int main( int argc, char **argv )
{
    QApplication app(argc, argv);
 
    bullshit *window =  new bullshit();
    window->show();
 
    QMessageBox::information( window, "startup msgbox", "The factory default will be used instead." );
    return app.exec();
}

int main( int argc, char **argv )
{
    QApplication app(argc, argv);

    bullshit *window =  new bullshit();
    window->show();

    QMessageBox::information( window, "startup msgbox", "The factory default will be used instead." );
    return app.exec();
}

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PS. Please, next time choose a different name for your class.

[cioannou]

You don't instatiate your class anywhere.

Try:

int main( int argc, char **argv )
{
    QApplication app(argc, argv);
 
    mydialogclass *window =  new mydialogclass();
    window->show();
 
    QMessageBox::information( window, "startup msgbox", "The factory default will be used instead." );
    return app.exec();
}

int main( int argc, char **argv )
{
    QApplication app(argc, argv);

    mydialogclass *window =  new mydialogclass();
    window->show();

    QMessageBox::information( window, "startup msgbox", "The factory default will be used instead." );
    return app.exec();
}

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PS. Please, next time choose a different name for your class.

Ooops. This was really noob.

Sorry for the class name, it just came out from my dissapointment.

Already 'renamed' it.

[cioannou]

I am sorry but it still doesn't work.

If I connect the button to an existing slot e.g. accept() then the button works.

#include <qapplication.h>
#include <qdialog.h>
#include <qmessagebox.h>
#include "ui_MyDialog.h"
 
class MyDialog : public QDialog
{
    public:
        MyDialog(QWidget *parent = 0);
    private:
     Ui::MyDialog ui;
    private slots:
        void msgbox();
};
 
MyDialog::MyDialog( QWidget *parent )
{
    ui.setupUi(this);
 
    connect(ui.helloButton,SIGNAL(clicked()),this,SLOT(msgbox()));
    connect(ui.pressMe,SIGNAL(clicked()),this,SLOT(accept()));
}
 
void MyDialog::msgbox()
{
     QMessageBox::information(0, "test","message");
}
 
int main(int argc, char **argv)
{
    QApplication app(argc, argv);
    MyDialog *window=new MyDialog;
 
    window->show();
    return app.exec();
}

#include <qapplication.h>
#include <qdialog.h>
#include <qmessagebox.h>
#include "ui_MyDialog.h"

class MyDialog : public QDialog
{
    public:
        MyDialog(QWidget *parent = 0);
    private:
     Ui::MyDialog ui;
    private slots:
        void msgbox();
};

MyDialog::MyDialog( QWidget *parent )
{
    ui.setupUi(this);

    connect(ui.helloButton,SIGNAL(clicked()),this,SLOT(msgbox()));
    connect(ui.pressMe,SIGNAL(clicked()),this,SLOT(accept()));
}

void MyDialog::msgbox()
{
     QMessageBox::information(0, "test","message");
}

int main(int argc, char **argv)
{
    QApplication app(argc, argv);
    MyDialog *window=new MyDialog;

    window->show();
    return app.exec();
}

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[jacek]

I am sorry but it still doesn't work.

Because there is no Q_OBJECT macro, you need it if you define new signals or slots in your class.

class MyDialog : public QDialog
{
    Q_OBJECT
    public:
       ...
};

class MyDialog : public QDialog
{
    Q_OBJECT
    public:
       ...
};

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