Checkboxes: check and uncheck

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Hi!!!

I need emit a signal when a checkbox is uncheck. I read about stateChanged(int state), but it doesn't work

I have something like that:

QCheckBox *Login;
Login = new QCheckBox;
QLineEdit *lineLogin;
lineLogin = new LineEdit;
 
lineLogin -> hide();
 
connect(Login, SIGNAL(clicked()), this, SLOT(showLineLogin()));
 
void window:: showLineLogin(){ lineLogin -> show}

QCheckBox *Login;
Login = new QCheckBox;
QLineEdit *lineLogin;
lineLogin = new LineEdit;

lineLogin -> hide();

connect(Login, SIGNAL(clicked()), this, SLOT(showLineLogin()));

void window:: showLineLogin(){ lineLogin -> show}

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I want a signal that hide again the lineLogin when "Login" is unchecked

How can I do that???

Thanks!!!