connect() problem

[Pawello]

Hi,
I've got a problem with compilation of my program. beneath I wrote file nowywpis.cpp with header- I have problem with proper use of function connect . After adding it my program to after compiling gives a result -107374181 instead of 0.
Thanks for your help:


nowywpis.h

#ifndef NOWYWPIS_H
#define NOWYWPIS_H
#include <QWidget>
 #include <QLabel>
QT_BEGIN_NAMESPACE
class QGroupBox;
class QComboBox;
QT_END_NAMESPACE
extern QMap<QString, QString> al;
extern QList<QString> Lista;                   //QMap and QList are made in another file
class NowyWpis : public QWidget
{
    Q_OBJECT
public:
  NowyWpis(QWidget *parent = 0);
private slots:
    void Aktual();
private:
    void Wybor ();
    void Dane ();
    QGroupBox *wybortr;
    QComboBox *wybierz;
    QLabel *ikona;
    QString wybrany;
};
#endif // NOWYWPIS_H

#ifndef NOWYWPIS_H
#define NOWYWPIS_H
#include <QWidget>
 #include <QLabel>
QT_BEGIN_NAMESPACE
class QGroupBox;
class QComboBox;
QT_END_NAMESPACE
extern QMap<QString, QString> al;
extern QList<QString> Lista;                   //QMap and QList are made in another file
class NowyWpis : public QWidget
{
    Q_OBJECT
public:
  NowyWpis(QWidget *parent = 0);
private slots:
    void Aktual();
private:
    void Wybor ();
    void Dane ();
    QGroupBox *wybortr;
    QComboBox *wybierz;
    QLabel *ikona;
    QString wybrany;
};
#endif // NOWYWPIS_H

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nowywpis.cpp

#include <QtGui>
#include "nowywpis.h"
NowyWpis::NowyWpis(QWidget *parent)
    : QWidget(parent)
{
Wybor ();
QVBoxLayout *Layout = new QVBoxLayout;
Layout->addWidget(wybortr);
setLayout(Layout);
setWindowTitle(tr("Dodaj "));
resize(800, 600);
}
void NowyWpis::Wybor ()
{
    wybortr = new QGroupBox(tr("Wybor "));
    QGridLayout *grid = new QGridLayout;
    wybierz = new QComboBox;
 
    extern void wypisz ();
    wypisz ();
    foreach (QString k, Lista)
    {
    wybierz->addItem(k);
    }
 
connect(wybierz, SIGNAL(currentIndexChanged(int)),
            this, SLOT(Aktual()));
  grid->addWidget(wybierz, 0, 0);
  grid->addWidget(ikona, 0, 1);
   wybortr->setLayout(grid);
}
void NowyWpis::Aktual ()
{
wybrany =(wybierz->currentText());
ikona = new QLabel();
ikona->setAlignment(Qt::AlignBottom | Qt::AlignRight);
ikona->setPixmap(QPixmap("Obrazy/+wybrany+"asd.png"));
}

#include <QtGui>
#include "nowywpis.h"
NowyWpis::NowyWpis(QWidget *parent)
    : QWidget(parent)
{
Wybor ();
QVBoxLayout *Layout = new QVBoxLayout;
Layout->addWidget(wybortr);
setLayout(Layout);
setWindowTitle(tr("Dodaj "));
resize(800, 600);
}
void NowyWpis::Wybor ()
{
    wybortr = new QGroupBox(tr("Wybor "));
    QGridLayout *grid = new QGridLayout;
    wybierz = new QComboBox;
                            
    extern void wypisz ();
    wypisz ();
    foreach (QString k, Lista)
    {
    wybierz->addItem(k);
    }

connect(wybierz, SIGNAL(currentIndexChanged(int)),
            this, SLOT(Aktual()));
  grid->addWidget(wybierz, 0, 0);
  grid->addWidget(ikona, 0, 1);
   wybortr->setLayout(grid);
}
void NowyWpis::Aktual ()
{
wybrany =(wybierz->currentText());
ikona = new QLabel();
ikona->setAlignment(Qt::AlignBottom | Qt::AlignRight);
ikona->setPixmap(QPixmap("Obrazy/+wybrany+"asd.png"));
}

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[sonulohani]

Because you're using the private member function outside the class.

void NowyWpis::Wybor ()

void NowyWpis::Wybor ()

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[Pawello]

Because you're using the private member function outside the class.

void NowyWpis::Wybor ()

void NowyWpis::Wybor ()

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If you mean that problem is because of making Wybor() private function, it's not reason of error- I made everrything in class public:

public:
NowyWpis(QWidget *parent = 0);
public slots:
void Aktual();
public:
void Wybor ();
void Dane();
QGroupBox *wybortr;
QComboBox *wybierz;
QLabel *ikona;
QString wybrany;

public:
NowyWpis(QWidget *parent = 0);
public slots:
void Aktual();
public:
void Wybor ();
void Dane();
QGroupBox *wybortr;
QComboBox *wybierz;
QLabel *ikona;
QString wybrany;

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but it didn't solve the problem

[Santosh Reddy]

void NowyWpis::Wybor ()
{
    wybortr = new QGroupBox(tr("Wybor "));
    QGridLayout *grid = new QGridLayout;
    wybierz = new QComboBox;
 
    extern void wypisz ();
    wypisz ();
    foreach (QString k, Lista)
    {
    wybierz->addItem(k);
    }
 
connect(wybierz, SIGNAL(currentIndexChanged(int)),
            this, SLOT(Aktual()));
 
  ikona = new QLabel(); //<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<< Add this
  grid->addWidget(wybierz, 0, 0);
  grid->addWidget(ikona, 0, 1); //<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<< Error
   wybortr->setLayout(grid);
}
void NowyWpis::Aktual ()
{
wybrany =(wybierz->currentText());
//ikona = new QLabel(); //<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<< Remove this 
ikona->setAlignment(Qt::AlignBottom | Qt::AlignRight);
ikona->setPixmap(QPixmap("Obrazy/+wybrany+"asd.png"));
}

void NowyWpis::Wybor ()
{
    wybortr = new QGroupBox(tr("Wybor "));
    QGridLayout *grid = new QGridLayout;
    wybierz = new QComboBox;
                            
    extern void wypisz ();
    wypisz ();
    foreach (QString k, Lista)
    {
    wybierz->addItem(k);
    }

connect(wybierz, SIGNAL(currentIndexChanged(int)),
            this, SLOT(Aktual()));

  ikona = new QLabel(); //<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<< Add this
  grid->addWidget(wybierz, 0, 0);
  grid->addWidget(ikona, 0, 1); //<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<< Error
   wybortr->setLayout(grid);
}
void NowyWpis::Aktual ()
{
wybrany =(wybierz->currentText());
//ikona = new QLabel(); //<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<< Remove this 
ikona->setAlignment(Qt::AlignBottom | Qt::AlignRight);
ikona->setPixmap(QPixmap("Obrazy/+wybrany+"asd.png"));
}

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You are using "ikona" before it the created

[Pawello]

Thank you- this solves the problem