/// <summary>Establishes the connection to the S韒aticNET OPC Server.</summary>
/// <param name="localeID"> The locale ID returned from IOPCCommon the OPC-Server </param>
/// <exception cref="InvalidOperationException"> if the opcserver is already connected </exception>
/// <exception cref="Exception">throws and forwards any exception (with short error description)</exception>
public void connectOPCServer(string progID)
{
if (!m_connected)
{
Type typeofOPCserver = null;
try
{
//Get the Type from ProgID.Text
typeofOPCserver = Type.GetTypeFromProgID(progID);
string strDummy = "Couldn't find a server with the ProgID '" + progID + "'!";
if (typeofOPCserver == null)
{
throw new Exception(strDummy);
}
// Must be freed with Marshal.ReleaseComObject(myOPCServer)
m_OPCServer = (IOPCServer)Activator.CreateInstance(typeofOPCserver);
if (m_OPCServer == null)
{
strDummy = "CreateInstance failed - server not connected!";
throw new Exception(strDummy);
}
// Don't free it - we don't AddRef it!!!
m_OPCCommon = (IOPCCommon)m_OPCServer;
if (m_OPCCommon == null)
{
strDummy = "No 'IOPCCommon' Interface found!";
throw new Exception(strDummy);
}
m_OPCCommon.GetLocaleID(out m_LocaleID);
m_connected = true;
}
catch (Exception)
{
throw;
}
}
else
{
throw new InvalidOperationException("Already connected to OPC-Server!");
}
}
/// <summary>adds a IOPCGroupStateMgt-object to the OPC-server</summary>
/// <param name="commonInterface">the common interface</param>
/// <returns> the revisedUpdateRate for further use </returns>
/// <exception cref="Exception">throws and forwards any exception (with short error description)</exception>
public int addOPCGroup(IOPCCommon commonInterface)
{
// initialize arguments.
Guid iid = Guid.Empty;
object objGroup = null;
IntPtr pTimeBias = IntPtr.Zero;
IntPtr pDeadband = IntPtr.Zero;
if (m_disposed)
{
throw new NullReferenceException("This object has been disposed!");
}
m_revUpdateRate = 0;
try
{
// get the default locale for the server.
commonInterface.GetLocaleID(out m_LocaleID);
iid = typeof(IOPCGroupStateMgt).GUID;
if (iid == Guid.Empty)
{
throw new Exception("Could not get the interface 'IOPCGroupStateMgt'!");
}
// Add a group object "m_OPCGroup" and query for interface IOPCItemMgt
// Parameter as following:
// [in] active, so do OnDataChange callback
// [in] Request this Update Rate from Server
// [in] Client Handle, not necessary in this sample
// [in] No time interval to system UTC time
// [in] No Deadband, so all data changes are reported
// [in] Server uses english language to for text values
// [out] Server handle to identify this group in later calls
// [out] The answer from Server to the requested Update Rate
// [in] requested interface type of the group object
// [out] pointer to the requested interface
m_OPCServer.AddGroup(m_grpName,
Convert.ToInt32(m_isActive),
m_reqUpdateRate,
m_grpClntHndl,
pTimeBias,
pDeadband,
m_LocaleID,
out m_grpSrvHndl,
out m_revUpdateRate,
ref iid,
out objGroup);
if (objGroup == null)
{
string strMsg = "Couldn't add the group '"
+ m_grpName + "' to the server!";
throw new Exception(strMsg);
}
// Get our reference from the created group
m_OPCGroupStateMgt = (IOPCGroupStateMgt)objGroup;
if (m_OPCGroupStateMgt == null)
{
throw new Exception("Could not get the interface 'IOPCGroupStateMgt'!");
}
}
catch (Exception)
{
throw;
}
return(m_revUpdateRate);
}
public void GetLocaleID(out int p_LocalID)
{
m_IfCommon.GetLocaleID(out p_LocalID);
}