Full warning message


Object::connect: No such slot QDialog::buttonClicked() in ../MyFolder/main.cpp:40

Cause

Operating system: Ubuntu

IDE: Qt Creator 2.0.0

Project type: Qt4 GUI Application

Compiler: G++ 4.4.1

Libraries used:

Boost: version 1.40
Qt: version 4.7.0 (32 bit)

Qt project file


#-------------------------------------------------

#

# Project created by QtCreator 2010-07-22T12:56:24

#

#-------------------------------------------------

QT += core gui

TARGET = CppQtExample11

TEMPLATE = app

SOURCES += main.cpp

HEADERS += \

    MyDialog.h

Source code

main.cpp


#include <boost/scoped_ptr.hpp>

#include <QtGui/QApplication>

#include <QDialog>

#include <QPushButton>

#include <QVBoxLayout>

#include "MyDialog.h"



int main(int argc, char *argv[])

{

  QApplication a(argc, argv);

  boost::scoped_ptr<MyDialog> dialog(new MyDialog);

  boost::scoped_ptr<QVBoxLayout> layout(new QVBoxLayout);

  boost::scoped_ptr<QPushButton> button1(new QPushButton);



  button1->connect(

    button1.get(),SIGNAL(clicked()),

    dialog.get(),SLOT(buttonClicked()));

  button2->setText("Quit");


  layout->addWidget(button1.get());



  dialog->setLayout(layout.get());



  dialog->show();

  return a.exec();

}

MyDialog.h


#ifndef MYDIALOG_H

#define MYDIALOG_H



#include <QDialog>



class MyDialog : public QDialog

{

  public slots:

    void buttonClicked() { }

};



#endif // MYDIALOG_H

Solution

Add the Q_OBJECT at the beginning of the MyDialog class declaration.


#ifndef MYDIALOG_H

#define MYDIALOG_H



#include <QDialog>



class MyDialog : public QDialog

{

  Q_OBJECT



  public slots:

    void buttonClicked() { }

};



#endif // MYDIALOG_H

Note that a complete example of the corrected version of this compile warning can be found at Qt example 12: creating a custom QDialog with slot.

Go back to Richel Bilderbeek's C++ page.

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