Dynamically linking signals and slots for buttons

[gab74]

I try to use the code below :

while(!child.isNull())
{
QPushButton * button = new QPushButton(child.text());
connect(button, SIGNAL(clicked()), &mapper, SLOT(map()));
mapper.setMapping(button, child.attribute("value"));
vLayout->addWidget(button);
 
child = child.nextSiblingElement("choice");
}
connect(mapper, SIGNAL(mapped(const QString &)), this, SLOT(onbuttonClicked(const QString &)));

while(!child.isNull())
{
QPushButton * button = new QPushButton(child.text());
connect(button, SIGNAL(clicked()), &mapper, SLOT(map()));
mapper.setMapping(button, child.attribute("value"));
vLayout->addWidget(button);
 
child = child.nextSiblingElement("choice");
}
connect(mapper, SIGNAL(mapped(const QString &)), this, SLOT(onbuttonClicked(const QString &)));

To copy to clipboard, switch view to plain text mode 

in the SLOT I receive correctly the value passed

void Mainwindow::onbuttonClicked(const QString& value)
    {
    // value is here to identify the button
 
	QPushButton* button = qobject_cast<QPushButton*>(sender());
 
    }

void Mainwindow::onbuttonClicked(const QString& value)
    {
    // value is here to identify the button

	QPushButton* button = qobject_cast<QPushButton*>(sender());

    }

To copy to clipboard, switch view to plain text mode 

the button object is always NULL, why this ?
I want to retrieve button name but the sender is always NULL..

[anda_skoa]

the button object is always NULL, why this ?

The sender of the signal is the QSIgnalMapper. It cannot be casted to QPushButton, so the qobject_cast returns a null pointer.

I want to retrieve button name but the sender is always NULL..

If you mean button pointer, see QSignalMapper::mapping()

Cheers,
_