public Form1()
{
InitializeComponent();
OpcCom.ServerEnumerator se = new ServerEnumerator();
Opc.Server[] Servers;
String sErrFunc = "";
Opc.ConnectData cd = new Opc.ConnectData(new System.Net.NetworkCredential());
sErrFunc = "GetAvailableServers";
Servers = se.GetAvailableServers(Opc.Specification.COM_DA_20, "localhost", cd);
Console.WriteLine(Servers[1].Name.ToString());
Opc.URL url = new Opc.URL("opcda://localhost/" + Servers[0].Name);
OpcCom.Factory fact = new OpcCom.Factory();
server = new Opc.Da.Server(fact, null);
server.Connect(url, new Opc.ConnectData(new System.Net.NetworkCredential()));
}
// Connect to OPC HDA server
public bool Connect(string HostName, string ServerName)
{
var url = new Opc.URL();
url.Scheme = Opc.UrlScheme.HDA;
url.HostName = HostName;
url.Path = ServerName;
try {
var fact = new OpcCom.Factory();
if ((_OPCServer != null) && (!_OPCServer.IsConnected))
{
_trace.TraceEvent(TraceEventType.Verbose, 0, "_OPCServer is disconnected, disposing object");
//Unfortunately, in case of lost connection simply calling .Connect() doesn't work :(
//Let's try to recreate the object from scratch
_OPCServer.Dispose();
_OPCServer = null;
}
if (_OPCServer == null)
{
_trace.TraceEvent(TraceEventType.Verbose, 0, "_OPCServer is null, creating new object");
_OPCServer = new Opc.Hda.Server(fact, null);
}
if (!_OPCServer.IsConnected)
{
_trace.TraceEvent(TraceEventType.Verbose, 0, "OPC server is disconnected, trying to connect");
_OPCServer.Connect(url, new Opc.ConnectData(new System.Net.NetworkCredential(), null));
if (!_OPCServer.IsConnected)
{
_trace.TraceEvent(TraceEventType.Error, 0, "Connection failed without exception: {0}", url.ToString());
return(false);
}
_trace.TraceEvent(TraceEventType.Verbose, 0, "Succesfully connected to {0}, obj: {1}", url.ToString(), _OPCServer.GetHashCode().ToString());
}
try {
Status = _OPCServer.GetStatus();
_trace.TraceEvent(TraceEventType.Verbose, 0, "OPC server status:\n" +
"\tCurrentTime: {0}\n" +
"\tMaxReturnValues: {1}\n" +
"\tProductVersion: {2}\n" +
"\tServerState: {3}\n" +
"\tStartTime: {4}\n" +
"\tStatusInfo: {5}\n" +
"\tVendorInfo: {6}\n",
Status.CurrentTime,
Status.MaxReturnValues,
Status.ProductVersion,
Status.ServerState,
Status.StartTime,
Status.StatusInfo,
Status.VendorInfo);
} catch (Exception e) {
_trace.TraceEvent(TraceEventType.Warning, 0, "Can't get server status: {0}, {1}", url.ToString(), e.Message);
}
try {
_trace.TraceEvent(TraceEventType.Verbose, 0, "SupportedAggregates:");
SupportedAggregates = _OPCServer.GetAggregates();
foreach (Opc.Hda.Aggregate agg in SupportedAggregates)
{
_trace.TraceEvent(TraceEventType.Verbose, 0, "{0}\t{1}\t{2}", agg.ID, agg.Name, agg.Description);
}
} catch (Exception e) {
_trace.TraceEvent(TraceEventType.Warning, 0, "Can't get server supported aggregates: {0}, {1}", url.ToString(), e.Message);
}
} catch (Exception e) {
_trace.TraceEvent(TraceEventType.Error, 0, "Connection failed: {0}, {1}", url.ToString(), e.Message);
return(false);
}
return(true);
}