ComboBox.getActiveId
string getActiveId()Returns the ID of the active row of combo_box. This value is taken from the active row and the column specified by the #GtkComboBox:id-column property of combo_box (see [gtk.combo_box.ComboBox.setIdColumn]).
The returned value is an interned string which means that you can compare the pointer by value to other interned strings and that you must not free it.
If the #GtkComboBox:id-column property of combo_box is not set, or if no row is active, or if the active row has a null ID value, then null is returned.
Returns
the ID of the active row, or null