signal mapping on pushbutton signal clicked

[wagmare]

hi friends,
i try to set the QPushButton() signal clicked() to connect
a slot changeIndex(int)

so i try signal Mapper so i do
mapping .h

#include <QSignalMapper>
 
signals:
        void clicked(int value);
 
public Q_SLOTS:
      void changeIndex(int index);
 
private:
        QSignalMapper *signalMapper;
        int mapValue[10];

#include <QSignalMapper>

signals:
        void clicked(int value);

public Q_SLOTS:
      void changeIndex(int index);

private:
        QSignalMapper *signalMapper;
        int mapValue[10];

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in mapping.cpp

/* signal Mapper*/
        mapValue[i] = 2;
        connect(cicsButton, SIGNAL(clicked()), signalMapper, SLOT(map()));
        signalMapper->setMapping(cicsButton, mapValue[1]);
 
        connect(signalMapper, SIGNAL(mapped(int)), this, SIGNAL(clicked(int)));
        connect(this, SIGNAL(clicked(int)), this, SLOT(changeIndex(int)));

/* signal Mapper*/
        mapValue[i] = 2;
        connect(cicsButton, SIGNAL(clicked()), signalMapper, SLOT(map()));
        signalMapper->setMapping(cicsButton, mapValue[1]);

        connect(signalMapper, SIGNAL(mapped(int)), this, SIGNAL(clicked(int)));
        connect(this, SIGNAL(clicked(int)), this, SLOT(changeIndex(int)));

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it compiled perfectly but when i run core dumped
when i try execute it gives Segmentation fault ....

i dont know where i done the mistake ...it crashes here ..

connect(cicsButton, SIGNAL(clicked()), signalMapper, SLOT(map()));

connect(cicsButton, SIGNAL(clicked()), signalMapper, SLOT(map()));

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please help .... why in run time it give seg. fault ....

[spirit]

[offtop]
you can optimazi this code

connect(signalMapper, SIGNAL(mapped(int)), this, SIGNAL(clicked(int)));
connect(this, SIGNAL(clicked(int)), this, SLOT(changeIndex(int)));

connect(signalMapper, SIGNAL(mapped(int)), this, SIGNAL(clicked(int)));
connect(this, SIGNAL(clicked(int)), this, SLOT(changeIndex(int)));

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like this

connect(signalMapper, SIGNAL(mapped(int)), this, SIGNAL(changeIndex(int)));

connect(signalMapper, SIGNAL(mapped(int)), this, SIGNAL(changeIndex(int)));

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[/offtop]

could you post compilable code which reproduces a crash?

[wagmare]

[offtop]
you can optimazi this code

connect(signalMapper, SIGNAL(mapped(int)), this, SIGNAL(clicked(int)));
connect(this, SIGNAL(clicked(int)), this, SLOT(changeIndex(int)));

connect(signalMapper, SIGNAL(mapped(int)), this, SIGNAL(clicked(int)));
connect(this, SIGNAL(clicked(int)), this, SLOT(changeIndex(int)));

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like this

connect(signalMapper, SIGNAL(mapped(int)), this, SIGNAL(changeIndex(int)));

connect(signalMapper, SIGNAL(mapped(int)), this, SIGNAL(changeIndex(int)));

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[/offtop]

could you post compilable code which reproduces a crash?

thanks for reply ...
sorry to the forum members ... i forget to initialize signalMapper
signalMapper = new QSignalMapper();
now its working ... sorry for this post ....