Pass variable from a form to another form

[cygnus2k]

I am novice but my way is:

principal.cpp

void Principal::on_pushButton_facturacion_clicked()
{
  Facturacion *form_factu = new Facturacion;   //Create new form with other class
  form_factu->show(); 
 
  QObject::connect(form_factu, SIGNAL(cambia(str_remote)), this, SLOT(muestramenu(str_local)));   //Connect when is emit signal cambia in the child form and pass the string to local function
}
 
void Principal::muestramenu(QString str_local)
{
    qDebug() << "Back to main" << str_local;
}

void Principal::on_pushButton_facturacion_clicked()
{
  Facturacion *form_factu = new Facturacion;   //Create new form with other class
  form_factu->show(); 

  QObject::connect(form_factu, SIGNAL(cambia(str_remote)), this, SLOT(muestramenu(str_local)));   //Connect when is emit signal cambia in the child form and pass the string to local function
}

void Principal::muestramenu(QString str_local)
{
    qDebug() << "Back to main" << str_local;
}

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facturacion.h

class Facturacion....
{
....
signals:
    void cambia(QString);
}

class Facturacion....
{
....
signals:
    void cambia(QString);
}

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facturacion.cpp

void Facturacion::on_edit_onchange()
{
  QString name;
  name = f_ui->edit->Text();
  emit cambia(name);
}

void Facturacion::on_edit_onchange()
{
  QString name;
  name = f_ui->edit->Text();
  emit cambia(name);
}

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Sorry for errors and my bad english.