Function CGEventKeyboardGetUnicodeString 

pub unsafe extern "C-unwind" fn CGEventKeyboardGetUnicodeString(
    event: Option<&CGEvent>,
    max_string_length: c_ulong,
    actual_string_length: *mut c_ulong,
    unicode_string: *mut u16,
)

👎Deprecated: renamed to CGEvent::keyboard_get_unicode_string

Available on crate features CGEvent and CGEventTypes only.