signal to be queried was unknown.
SignalQuery.signalId
uint signalId() @property nothrowGet signalId field.
Returns
The signal id of the signal being queried, or 0 if the
void signalId(uint propval) @property nothrowSet signalId field.
Parameters
propval | The signal id of the signal being queried, or 0 if the signal to be queried was unknown. |