protected Subscription(SerializationInfo info, StreamingContext context)
{
this.m_server = null;
this.m_subscription = null;
this.m_state = new SubscriptionState();
this.m_name = null;
this.m_filters = new SubscriptionFilters();
this.m_categories = new CategoryCollection();
this.m_areas = new StringCollection();
this.m_sources = new StringCollection();
this.m_attributes = new AttributeDictionary();
this.m_state = (SubscriptionState)info.GetValue("ST", typeof(SubscriptionState));
this.m_filters = (SubscriptionFilters)info.GetValue("FT", typeof(SubscriptionFilters));
this.m_attributes = (AttributeDictionary)info.GetValue("AT", typeof(AttributeDictionary));
this.m_name = this.m_state.Name;
this.m_categories = new CategoryCollection(this.m_filters.Categories.ToArray());
this.m_areas = new StringCollection(this.m_filters.Areas.ToArray());
this.m_sources = new StringCollection(this.m_filters.Sources.ToArray());
}
public Subscription(Opc.Ae.Server server, ISubscription subscription, SubscriptionState state)
{
this.m_server = null;
this.m_subscription = null;
this.m_state = new SubscriptionState();
this.m_name = null;
this.m_filters = new SubscriptionFilters();
this.m_categories = new CategoryCollection();
this.m_areas = new StringCollection();
this.m_sources = new StringCollection();
this.m_attributes = new AttributeDictionary();
if (server == null)
{
throw new ArgumentNullException("server");
}
if (subscription == null)
{
throw new ArgumentNullException("subscription");
}
this.m_server = server;
this.m_subscription = subscription;
this.m_state = (SubscriptionState)state.Clone();
this.m_name = state.Name;
}
/// <summary>
/// Returns a list of servers that support the specified specification on the specified host.
/// </summary>
public Opc.Server[] GetAvailableServers(Specification specification, string host, ConnectData connectData)
{
lock (this)
{
NetworkCredential credentials = (connectData != null)?connectData.GetCredential(null, null):null;
// connect to the server.
m_server = (IOPCServerList2)OpcCom.Interop.CreateInstance(CLSID, host, credentials);
m_host = host;
try
{
ArrayList servers = new ArrayList();
// convert the interface version to a guid.
Guid catid = new Guid(specification.ID);
// get list of servers in the specified specification.
IOPCEnumGUID enumerator = null;
m_server.EnumClassesOfCategories(
1,
new Guid[] { catid },
0,
null,
out enumerator);
// read clsids.
Guid[] clsids = ReadClasses(enumerator);
// release enumerator object.
OpcCom.Interop.ReleaseServer(enumerator);
enumerator = null;
// fetch class descriptions.
foreach (Guid clsid in clsids)
{
Factory factory = new OpcCom.Factory();
try
{
URL url = CreateUrl(specification, clsid);
Opc.Server server = null;
if (specification == Specification.COM_DA_30)
{
server = new Opc.Da.Server(factory, url);
}
else if (specification == Specification.COM_DA_20)
{
server = new Opc.Da.Server(factory, url);
}
else if (specification == Specification.COM_AE_10)
{
server = new Opc.Ae.Server(factory, url);
}
else if (specification == Specification.COM_HDA_10)
{
server = new Opc.Hda.Server(factory, url);
}
else if (specification == Specification.COM_DX_10)
{
server = new Opc.Dx.Server(factory, url);
}
servers.Add(server);
}
catch (Exception)
{
// ignore bad clsids.
}
}
return((Opc.Server[])servers.ToArray(typeof(Opc.Server)));
}
finally
{
// free the server.
OpcCom.Interop.ReleaseServer(m_server);
m_server = null;
}
}
}
