/// <summary>
/// Returns a list of servers that support the specified specification.
/// </summary>
/// <param name="specification">Unique identifier for one OPC specification.</param>
/// <param name="discoveryServerUrl">The URL of the discovery server to be used.</param>
/// <param name="identity">The user identity to use when discovering the servers.</param>
/// <returns>Returns a list of found OPC servers.</returns>
public static List <OpcServer> GetServers(OpcSpecification specification, string discoveryServerUrl, OpcUserIdentity identity)
{
List <OpcServer> serverList = new List <OpcServer>();
bool discovery = specification == OpcSpecification.OPC_AE_10 || (specification == OpcSpecification.OPC_DA_20 ||
specification == OpcSpecification.OPC_DA_30) || specification == OpcSpecification.OPC_HDA_10;
if (discovery)
{
if (discovery_ == null || hostName_ != discoveryServerUrl)
{
discovery_?.Dispose();
hostName_ = discoveryServerUrl;
discovery_ = new ServerEnumerator();
}
OpcServer[] servers = discovery_.GetAvailableServers(specification);
if (servers != null)
{
foreach (OpcServer server in servers)
{
serverList.Add(server);
}
}
}
return(serverList);
}
/// <summary>
/// Initializes an instance by providing OPC specification, OPC URL scheme and an URL string.
/// </summary>
/// <param name="specification">A description of an interface version defined by an OPC specification.</param>
/// <param name="scheme">The scheme (protocol) for the URL</param>
/// <param name="url">The URL of the OPC server.</param>
public OpcUrl(OpcSpecification specification, string scheme, string url)
{
Specification = specification;
HostName = "localhost";
Port = 0;
Path = null;
ParseUrl(url);
Scheme = scheme;
}
/// <summary>
/// Returns a list of servers that support the specified specification.
/// </summary>
/// <param name="specification">Unique identifier for one OPC specification.</param>
/// <param name="discoveryServerUrl">The URL of the discovery server to be used.</param>
/// <param name="identity">The user identity to use when discovering the servers.</param>
/// <returns>Returns a list of found OPC servers.</returns>
public static List <OpcServer> GetServers(OpcSpecification specification, string discoveryServerUrl, OpcUserIdentity identity)
{
List <OpcServer> serverList = new List <OpcServer>();
bool dcomDiscovery = false;
if (specification == OpcSpecification.OPC_AE_10)
{
dcomDiscovery = true;
}
if (specification == OpcSpecification.OPC_DA_20 ||
specification == OpcSpecification.OPC_DA_30)
{
dcomDiscovery = true;
}
if (specification == OpcSpecification.OPC_HDA_10)
{
dcomDiscovery = true;
}
if (specification == null)
{
return(serverList);
}
else if (dcomDiscovery)
{
if (_discovery == null || _hostName != discoveryServerUrl)
{
if (_discovery != null)
{
_discovery.Dispose();
}
_hostName = discoveryServerUrl;
_discovery = new Technosoftware.DaAeHdaClient.Com.ServerEnumerator();
}
OpcServer[] servers = _discovery.GetAvailableServers(specification);
if (servers != null)
{
foreach (OpcServer server in servers)
{
serverList.Add(server);
}
}
}
return(serverList);
}
/// <summary>
/// Returns a list of servers that support the specified specification.
/// </summary>
/// <param name="specification">Unique identifier for one OPC specification.</param>
/// <param name="discoveryServerUrl">The URL of the discovery server to be used.</param>
/// <returns>Returns a list of found OPC servers.</returns>
public static List <OpcServer> GetServers(OpcSpecification specification, string discoveryServerUrl)
{
OpcUserIdentity identity = new OpcUserIdentity("", "");
return(GetServers(specification, discoveryServerUrl, identity));
}
/// <summary>
/// Returns a list of servers that support the specified specification.
/// </summary>
/// <param name="specification">Unique identifier for one OPC specification.</param>
/// <returns>Returns a list of found OPC servers.</returns>
public static List <OpcServer> GetServers(OpcSpecification specification)
{
OpcUserIdentity identity = new OpcUserIdentity("", "");
return(GetServers(specification, null, identity));
}
