Given the name of the signal and the type of object it connects to, gets the signal’s identifying integer. Emitting the signal by number is somewhat faster than using the name each time.
Also tries the ancestors of the given type.
The type class passed as
itype must already have been instantiated (for
example, using g_type_class_ref()) for this function to work, as signals are
always installed during class initialization.
g_signal_new() for details on allowed signal names.
The signal’s name.
The data is owned by the caller of the function. The value is a NUL terminated UTF-8 string.
The type that the signal operates on.