public static List <OPCServer> BrowseServers(string hostname, NetworkCredential networkCredential = null, bool DAVersion3 = false)
{
List <OPCServer> servers = new List <OPCServer>();
Guid clsidcat;
if (DAVersion3)
{
clsidcat = new Guid("{CC603642-66D7-48F1-B69A-B625E73652D7}"); //OPC Data Access Servers Version 3.
}
else
{
clsidcat = new Guid("{63D5F432-CFE4-11D1-B2C8-0060083BA1FB}"); //OPC Data Access Servers Version 2.
}
Guid clsidenum = new Guid("{13486D51-4821-11D2-A494-3CB306C10000}"); //OPCEnum.exe
try
{
IOPCServerList2 serverList = (IOPCServerList2)Internal.Interop.CreateInstance(clsidenum, hostname, networkCredential);
IOPCEnumGUID pIOPCEnumGuid;
serverList.EnumClassesOfCategories(1, ref clsidcat, 0, ref clsidcat, out pIOPCEnumGuid);
string pszProgID;
string pszUserType;
string pszVerIndProgID;
Guid guid = new Guid();
int nServerCnt = 0;
uint iRetSvr;
pIOPCEnumGuid.Next(1, out guid, out iRetSvr);
while (iRetSvr != 0)
{
nServerCnt++;
serverList.GetClassDetails(ref guid, out pszProgID,
out pszUserType, out pszVerIndProgID);
OPCServer server = new OPCServer()
{
Guid = guid,
ProgId = pszProgID,
HostName = hostname,
};
servers.Add(server);
pIOPCEnumGuid.Next(1, out guid, out iRetSvr);
}
Internal.Interop.ReleaseServer(serverList);
}
catch (System.Exception ex)
{
Console.Out.WriteLine(ex.Message);
}
return(servers);
}
void FillServerList()
{
string hostName = localServerButton.Checked ? "localhost" : serverTextBox.Text;
serversComboBox.Items.Clear();
try
{
Type serverListType = Type.GetTypeFromProgID("OPC.ServerList", hostName);
IOPCServerList2 serverList = (IOPCServerList2)Activator.CreateInstance(serverListType);
Guid[] categories = { typeof(CATID_OPCDAServer10).GUID };
IOPCEnumGUID enumGuids;
serverList.EnumClassesOfCategories(categories.Length, categories, 0, null, out enumGuids);
int fetched;
enumGuids.Reset();
do
{
Guid[] ids = new Guid[10];
enumGuids.Next(ids.Length, ids, out fetched);
for (int i = 0; i < fetched; i++)
{
string progId;
string name;
string vendorId;
serverList.GetClassDetails(ref ids[i], out progId, out name, out vendorId);
serversComboBox.Items.Add(progId);
}
} while (fetched > 0);
if (serversComboBox.Items.Count > 0)
{
serversComboBox.Text = serversComboBox.Items[0].ToString();
}
}
catch (System.Exception)
{
}
}
/// <summary>
/// Return a list of local OPC A&E servers URLs.
/// </summary>
public static string[] GetLocalAeServers()
{
IOPCServerList2 m_server = null;
// Establish connection to the OPC Server
m_server = (IOPCServerList2)Helper.CreateInstance(CLSID, "localhost", null);
try
{
ArrayList servers = new ArrayList();
string[] urls = null;
// convert the interface version to a guid.
Guid catid = new Guid("58E13251-AC87-11d1-84D5-00608CB8A7E9");
// 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);
enumerator = null;
urls = new string[clsids.Length];
int i = 0;
// fetch class descriptions.
foreach (Guid clsid in clsids)
{
string progId;
string sTemp1;
string sTemp2;
Guid tempClsid = clsid;
try
{
m_server.GetClassDetails(
ref tempClsid,
out progId,
out sTemp1,
out sTemp2);
sTemp1 = "opcae://localhost/" + progId;
urls[i] = sTemp1;
i++;
}
catch (Exception)
{
// ignore bad clsids.
}
}
// free the server.
Helper.ReleaseServer(m_server);
m_server = null;
return(urls);
}
finally
{
// free the server.
Helper.ReleaseServer(m_server);
m_server = null;
}
}
