Dynamically created buttons to one slot

[rdkk]

Hi,
I am dynamically creating QPushButtons in ui and holding them in array. After clicking one of them I want to call function with integer parameter. It will be button index in array so I need to know which button was clicked to call this function.

I coded like this:

MainWindow::MainWindow(QWidget *parent, struct ProfileParams profPar) :
    QMainWindow(parent),
    ui(new Ui::MainWindow)
{
	ui->setupUi(this);
	this->showMaximized();
              QPushButton * btn[16];
	QSignalMapper* sendSignalMapper = new QSignalMapper(this);//sendMessage
	int k = 0, l = 1, a = 0;
 
	for(int j=1; j<=profPar.number; j++)
	{
			btn[j-1] = new QPushButton;
			btn[j-1]->setSizePolicy(QSizePolicy::Expanding, QSizePolicy::Expanding);
			sendSignalMapper->setMapping(btn[j-1],j-1);
			connect(btn[j-1],SIGNAL(clicked()),sendSignalMapper,SLOT(map()));
	}
	connect(sendSignalMapper,SIGNAL(mapped(int)),this ,SLOT(send_data(int)));
	}
	else
	{
		QMessageBox::critical(this,"Error", "Cannot open!", QMessageBox::Ok);
		exit(0);
	}
}
 
void MainWindow::send_data(int number)
{
	sendDat("#WAIT", number);
}

MainWindow::MainWindow(QWidget *parent, struct ProfileParams profPar) :
    QMainWindow(parent),
    ui(new Ui::MainWindow)
{
	ui->setupUi(this);
	this->showMaximized();
              QPushButton * btn[16];
	QSignalMapper* sendSignalMapper = new QSignalMapper(this);//sendMessage
	int k = 0, l = 1, a = 0;
	
	for(int j=1; j<=profPar.number; j++)
	{
			btn[j-1] = new QPushButton;
			btn[j-1]->setSizePolicy(QSizePolicy::Expanding, QSizePolicy::Expanding);
			sendSignalMapper->setMapping(btn[j-1],j-1);
			connect(btn[j-1],SIGNAL(clicked()),sendSignalMapper,SLOT(map()));
	}
	connect(sendSignalMapper,SIGNAL(mapped(int)),this ,SLOT(send_data(int)));
	}
	else
	{
		QMessageBox::critical(this,"Error", "Cannot open!", QMessageBox::Ok);
		exit(0);
	}
}

void MainWindow::send_data(int number)
{
	sendDat("#WAIT", number);
}

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and it isn't working - why?

sorry for my "English"