public OpcServer CreateFromClsId(Guid clsid)
{
var obj = ComUtils.CreateInstance(clsid, null, null);
if (obj != null)
{
return(new OpcServer(obj));
}
return(null);
}
public static OpcServerFactory Connect()
{
var obj = ComUtils.CreateInstance(OpcServerListGuid, null, null);
if (obj != null)
{
return(new OpcServerFactory(obj));
}
throw new Exception(); //TODO: xxxx
}
/// <summary>
/// Connects to OPCEnum on the specified machine.
/// </summary>
public void Connect(string host, UserIdentity identity)
{
// disconnect from current server.
Disconnect();
// create in the instance.
object unknown = null;
try
{
unknown = ComUtils.CreateInstance(OPCEnumCLSID, host, identity);
}
catch (Exception e)
{
throw ServiceResultException.Create(StatusCodes.BadCommunicationError, e, "Could not connect to OPCEnum server.");
}
m_server = unknown as IOPCServerList2;
if (m_server == null)
{
ComUtils.ReleaseServer(unknown);
StringBuilder error = new StringBuilder();
error.Append("Server does not support IOPCServerList2. ");
error.Append("The OPC proxy/stubs may not be installed properly or the client or server machine. ");
error.Append("The also could be a problem with DCOM security configuration.");
throw ServiceResultException.Create(StatusCodes.BadCommunicationError, error.ToString());
}
m_host = host;
if (String.IsNullOrEmpty(m_host))
{
m_host = "localhost";
}
}
/// <summary>
/// Connects to the specified COM server server.
/// </summary>
public object CreateServer(Uri uri, UserIdentity identity)
{
// parse path to find prog id and clsid.
string progID = uri.LocalPath;
string clsid = null;
while (progID.StartsWith("/"))
{
progID = progID.Substring(1);
}
int index = progID.IndexOf('/');
if (index >= 0)
{
clsid = progID.Substring(index + 1);
progID = progID.Substring(0, index);
}
// look up prog id if clsid not specified in the uri.
Guid guid = Guid.Empty;
if (String.IsNullOrEmpty(clsid))
{
// connect to enumerator.
Connect(uri.Host, identity);
// use OpcEnum to lookup the prog id.
guid = CLSIDFromProgID(progID);
// check if prog id is actually a clsid string.
if (guid == Guid.Empty)
{
clsid = progID;
}
}
// convert CLSID to a GUID.
if (guid == Guid.Empty)
{
try
{
guid = new Guid(clsid);
}
catch (Exception e)
{
throw ServiceResultException.Create(StatusCodes.BadCommunicationError, e, "COM server URI does not contain a valid CLSID or ProgID.");
}
}
// use normal activation.
return(ComUtils.CreateInstance(guid, uri.Host, identity));
#if COM_IMPERSONATION_SUPPORT
// set the current thread token.
IPrincipal existingPrincipal = Thread.CurrentPrincipal;
WindowsPrincipal principal = ComUtils.GetPrincipalFromUserIdentity(identity);
try
{
if (principal != null)
{
Thread.CurrentPrincipal = principal;
}
// activate with a license key if one provided.
if (identity != null && !String.IsNullOrEmpty(identity.LicenseKey))
{
return(ComUtils.CreateInstanceWithLicenseKey(guid, uri.Host, identity, identity.LicenseKey));
}
// use normal activation.
return(ComUtils.CreateInstance(guid, uri.Host, identity));
}
finally
{
Thread.CurrentPrincipal = existingPrincipal;
}
#endif
}
