Since 2.30A GObject.Value to store the return value. May be null if the callback of closure doesn't return a value.
The length of the param_values array.
An array of GValues holding the arguments on which to invoke the callback of closure.
Optionalinvocation_hint: anyThe invocation hint given as the last argument to g_closure_invoke().
Optionalmarshal_data: anyAdditional data specified when registering the marshaller, see g_closure_set_marshal() and g_closure_set_meta_marshal()
A generic marshaller function implemented via libffi.
Normally this function is not passed explicitly to
g_signal_new(), but used automatically by GLib when specifying anullmarshaller.