connect() - connecting to slot and passing arguments

[Tomasz]

I've changed string - different for each button:

for (int j=0; j<4; j++)
{
button[j] = new QPushButton;
connect(button[j], SIGNAL(clicked()), signalMapper, SLOT(map()));
signalMapper->setMapping(button[j], QString::number(j));
connect(signalMapper, SIGNAL(mapped(QString)), this, SLOT(myFun(QString)));
}

for (int j=0; j<4; j++)
{
button[j] = new QPushButton;
connect(button[j], SIGNAL(clicked()), signalMapper, SLOT(map()));
signalMapper->setMapping(button[j], QString::number(j));
connect(signalMapper, SIGNAL(mapped(QString)), this, SLOT(myFun(QString)));
}

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And if I click on firs button function is triggered 4 times with '0', on second - four times with '1'. Why?

---------------------------------------------------OK, again solved

connect(signalMapper, SIGNAL(mapped(QString)), this, SLOT(myFun(QString)));

connect(signalMapper, SIGNAL(mapped(QString)), this, SLOT(myFun(QString)));

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should be once.

thanks
best regards
Tomasz