code: func (v *EntryBuffer) GetText() (string, error) {
  	c := C.gtk_entry_buffer_get_text(v.native())
  	if c == nil {
  		return "", nilPtrErr
  	}
  	return goString(c), nil
  }
docs: // GetText() is a wrapper around gtk_entry_buffer_get_text().  A
  // non-nil error is returned in the case that gtk_entry_buffer_get_text
  // returns NULL to differentiate between NULL and an empty string.