static private void UpdateField <T>(FieldInfo fi, T target, UPnPService service) where T : DispatcherObject, IUPnPServiceCallback
{
try
{
object stateVariable = Convert.ChangeType(service.QueryStateVariable(fi.Name.Substring(1)), fi.FieldType, CultureInfo.InvariantCulture);
if (String.CompareOrdinal(stateVariable.ToString(), "NOT_IMPLEMENTED") != 0)
{
target.Dispatcher.BeginInvoke(DispatcherPriority.Background, (ThreadStart) delegate { target.StateVariableChanged(service, fi.Name.Substring(1), stateVariable); });
}
}
catch (COMException e)
{
// this comes back for a reasonable percentage of the variables
const int UPNP_E_DEVICE_ERROR = unchecked ((int)0x80040214);
if (e.ErrorCode == UPNP_E_DEVICE_ERROR)
{
return;
}
// a few others fail here but they get updated by the service callbacks later...
const int UPNP_E_INVALID_VARIABLE = unchecked ((int)0x80040213);
if (e.ErrorCode == UPNP_E_INVALID_VARIABLE)
{
return;
}
// dunno about this one
const int UPNP_E_VARIABLE_VALUE_UNKNOWN = unchecked ((int)0x80040212);
if (e.ErrorCode == UPNP_E_VARIABLE_VALUE_UNKNOWN)
{
return;
}
Console.WriteLine("StateVariable Exception @ {0}: {1}", fi.Name, e.ToString());
}
}