/// <summary> /// Fetches the set of data filters from the server. /// </summary> /// <param name="server">The server object</param> public TsCCpxComplexItem[] GetDataFilters(TsCDaServer server) { // not a valid operation for data filter items. if (_unfilteredItemID != null) { return(null); } // data filters not supported by the item. if (_filterItem == null) { return(null); } TsCDaBrowsePosition position = null; try { // browse any existing filter instances. TsCDaBrowseFilters filters = new TsCDaBrowseFilters { ElementNameFilter = null, BrowseFilter = TsCDaBrowseFilter.Item, ReturnAllProperties = false, PropertyIDs = CPX_PROPERTIES, ReturnPropertyValues = true }; TsCDaBrowseElement[] elements = server.Browse(_filterItem, filters, out position); // nothing found. if (elements == null || elements.Length == 0) { return(new TsCCpxComplexItem[0]); } // contruct an array of complex data items for each available data filter. ArrayList dataFilters = new ArrayList(elements.Length); Array.ForEach(elements, element => { TsCCpxComplexItem item = new TsCCpxComplexItem(); if (item.Init(element)) { dataFilters.Add(item); } }); // return the set of available data filters. return((TsCCpxComplexItem[])dataFilters.ToArray(typeof(TsCCpxComplexItem))); } finally { if (position != null) { position.Dispose(); position = null; } } }
/// <summary> /// Creates a new data filter. /// </summary> /// <param name="server">The server object</param> /// <param name="filterName">The name of the filter</param> /// <param name="filterValue">The value of the filter</param> public TsCCpxComplexItem CreateDataFilter(TsCDaServer server, string filterName, string filterValue) { // not a valid operation for data filter items. if (_unfilteredItemID != null) { return(null); } // data filters not supported by the item. if (_filterItem == null) { return(null); } TsCDaBrowsePosition position = null; try { // write the desired filter to the server. TsCDaItemValue item = new TsCDaItemValue(_filterItem); // create the filter parameters document. using (StringWriter ostrm = new StringWriter()) { using (XmlTextWriter writer = new XmlTextWriter(ostrm)) { writer.WriteStartElement("DataFilters"); writer.WriteAttributeString("Name", filterName); writer.WriteString(filterValue); writer.WriteEndElement(); writer.Close(); } // create the value to write. item.Value = ostrm.ToString(); } item.Quality = TsCDaQuality.Bad; item.QualitySpecified = false; item.Timestamp = DateTime.MinValue; item.TimestampSpecified = false; // write the value. OpcItemResult[] result = server.Write(new TsCDaItemValue[] { item }); if (result == null || result.Length == 0) { throw new OpcResultException(new OpcResult((int)OpcResult.E_FAIL.Code, OpcResult.FuncCallType.SysFuncCall, null), "Unexpected results returned from server."); } if (result[0].Result.Failed()) { throw new OpcResultException(new OpcResult((int)OpcResult.Cpx.E_FILTER_ERROR.Code, OpcResult.FuncCallType.SysFuncCall, null), "Could not create new data filter."); } // browse for new data filter item. TsCDaBrowseFilters filters = new TsCDaBrowseFilters { ElementNameFilter = filterName, BrowseFilter = TsCDaBrowseFilter.Item, ReturnAllProperties = false, PropertyIDs = CPX_PROPERTIES, ReturnPropertyValues = true }; TsCDaBrowseElement[] elements = server.Browse(_filterItem, filters, out position); // nothing found. if (elements == null || elements.Length == 0) { throw new OpcResultException(new OpcResult((int)OpcResult.Cpx.E_FILTER_ERROR.Code, OpcResult.FuncCallType.SysFuncCall, null), "Could not browse to new data filter."); } TsCCpxComplexItem filterItem = new TsCCpxComplexItem(); if (!filterItem.Init(elements[0])) { throw new OpcResultException(new OpcResult((int)OpcResult.Cpx.E_FILTER_ERROR.Code, OpcResult.FuncCallType.SysFuncCall, null), "Could not initialize to new data filter."); } // return the new data filter. return(filterItem); } finally { if (position != null) { position.Dispose(); position = null; } } }
/// <summary> /// Fetches the set of type conversions from the server. /// </summary> /// <param name="server">The server object</param> public TsCCpxComplexItem[] GetTypeConversions(TsCDaServer server) { // only the root item can have type conversions. if (_unconvertedItemID != null || _unfilteredItemID != null) { return(null); } TsCDaBrowsePosition position = null; try { // look for the 'CPX' branch. TsCDaBrowseFilters filters = new TsCDaBrowseFilters { ElementNameFilter = CPX_BRANCH, BrowseFilter = TsCDaBrowseFilter.Branch, ReturnAllProperties = false, PropertyIDs = null, ReturnPropertyValues = false }; TsCDaBrowseElement[] elements = server.Browse(this, filters, out position); // nothing found. if (elements == null || elements.Length == 0) { return(null); } // release the browse position object. if (position != null) { position.Dispose(); position = null; } // browse for type conversions. OpcItem itemID = new OpcItem(elements[0].ItemPath, elements[0].ItemName); filters.ElementNameFilter = null; filters.BrowseFilter = TsCDaBrowseFilter.Item; filters.ReturnAllProperties = false; filters.PropertyIDs = CPX_PROPERTIES; filters.ReturnPropertyValues = true; elements = server.Browse(itemID, filters, out position); // nothing found. if (elements == null || elements.Length == 0) { return(new TsCCpxComplexItem[0]); } // contruct an array of complex data items for each available conversion. ArrayList conversions = new ArrayList(elements.Length); Array.ForEach(elements, element => { if (element.Name != CPX_DATA_FILTERS) { TsCCpxComplexItem item = new TsCCpxComplexItem(); if (item.Init(element)) { // check if data filters supported for type conversion. item.GetDataFilterItem(server); conversions.Add(item); } } }); // return the set of available conversions. return((TsCCpxComplexItem[])conversions.ToArray(typeof(TsCCpxComplexItem))); } finally { if (position != null) { position.Dispose(); position = null; } } }