[SOLVED]Qt signals and slots in different classes

[Spike89]

I made a public slot in this class:
@class open : public QObject
{
Q_OBJECT

public:
open();
QString filename;
QByteArray ba;
public slots:
void openfile(){
filename=QFileDialog::getOpenFileName(
0,
QObject::tr("Open File"),
("C://"),
("BITMAP(*.bmp)")
);
QFile file(filename);

        file.open(QIODevice::ReadOnly);
        ba=file.readAll();


}

};@
I want to connect this slot to my pushbutton's signal in the mainwindow.cpp like this:
@open x;
connect(ui->pushButton,SIGNAL(clicked()),
&x,SLOT(openfile()));
@
But nothing happend when i pushed the button. What am is doing wrong?

[sierdzio]

You create "x" on stack and without a parent. It will be destroyed when it goes out of scope, and so it will not respond to the signal.

[Spike89]

[quote author="sierdzio" date="1397126276"]You create "x" on stack and without a parent. It will be destroyed when it goes out of scope, and so it will not respond to the signal.[/quote]

Thank you.