/// <summary>
/// Checks the type of the data.
/// </summary>
/// <param name="expectedType">The expected type.</param>
/// <param name="value">The value.</param>
/// <returns>True if the value can be written to the server.</returns>
private bool CheckDataType(short expectedType, Variant value)
{
if (value.Value == null)
{
return(true);
}
if (expectedType == (short)VarEnum.VT_CY)
{
expectedType = (short)VarEnum.VT_BSTR;
}
if (expectedType == (short)(VarEnum.VT_ARRAY | VarEnum.VT_CY))
{
expectedType = (short)(VarEnum.VT_ARRAY | VarEnum.VT_BSTR);
}
TypeInfo typeInfo = value.TypeInfo;
VarEnum vtType = ComUtils.GetVarType(typeInfo);
if (vtType == VarEnum.VT_EMPTY)
{
return(false);
}
if (expectedType == (short)(VarEnum.VT_ARRAY | VarEnum.VT_VARIANT))
{
// must be an array.
Array array = value.Value as Array;
if (array == null || (typeInfo.BuiltInType == BuiltInType.ByteString && typeInfo.ValueRank == ValueRanks.Scalar))
{
return(false);
}
// nothing more to for fixed type arrays.
if (typeInfo.BuiltInType != BuiltInType.Variant)
{
return(true);
}
// must check each element.
for (int ii = 0; ii < array.GetLength(0); ii++)
{
object element = array.GetValue(ii);
if (!CheckDataType((short)VarEnum.VT_VARIANT, new Variant(element)))
{
return(false);
}
}
}
if (expectedType == (short)vtType || expectedType == (short)VarEnum.VT_VARIANT)
{
return(true);
}
return(false);
}
/// <summary>
/// Converts a UA value to an HDA attribute value.
/// </summary>
/// <param name="session">The session.</param>
/// <param name="attributeId">The attribute id.</param>
/// <param name="values">The values.</param>
/// <param name="index">The index.</param>
/// <returns></returns>
private DaValue GetAttributeValue(Session session, uint attributeId, DataValueCollection values, int index)
{
switch (attributeId)
{
case Constants.OPCHDA_DATA_TYPE:
{
DaValue result = new DaValue();
DataValue value = values[index];
// check for valid node.
if (StatusCode.IsBad(value.StatusCode))
{
result.Error = ResultIds.E_UNKNOWNITEMID;
return(result);
}
// covert to var type.
NodeId dataTypeId = value.GetValue <NodeId>(DataTypeIds.BaseDataType);
int valueRank = values[index + 1].GetValue <int>(ValueRanks.Scalar);
BuiltInType builtInType = DataTypes.GetBuiltInType(dataTypeId, session.TypeTree);
TypeInfo typeInfo = new TypeInfo(builtInType, valueRank);
short varType = (short)ComUtils.GetVarType(typeInfo);
result.Value = varType;
result.Quality = ComUtils.GetQualityCode(value.StatusCode);
result.Timestamp = value.ServerTimestamp;
result.Error = ResultIds.S_OK;
return(result);
}
case Constants.OPCHDA_DESCRIPTION:
{
DataValue value = values[index];
if (value.StatusCode == StatusCodes.BadAttributeIdInvalid)
{
DaValue result = new DaValue();
result.Error = ResultIds.E_INVALIDATTRID;
return(result);
}
return(m_mapper.GetLocalDataValue(value));
}
default:
{
return(ComHdaProxy.GetAttributeValue(session, m_mapper, attributeId, values[index]));
}
}
}
/// <summary>
/// Validates the items by reading the attributes required to add them to the group.
/// </summary>
/// <param name="session">The session.</param>
/// <param name="group">The group.</param>
/// <param name="requests">The requests.</param>
/// <param name="items">The items.</param>
/// <param name="start">The start index.</param>
/// <param name="count">The number of items to process.</param>
private void ValidateItems(
Session session,
ComDaGroup group,
ComDaCreateItemRequest[] requests,
ComDaGroupItem[] items,
int start,
int count)
{
// build list of the UA attributes that need to be read.
ReadValueIdCollection attributesToRead = new ReadValueIdCollection();
for (int ii = start; ii < start + count && ii < requests.Length; ii++)
{
// create the group item.
ComDaCreateItemRequest request = requests[ii];
ComDaGroupItem item = items[ii] = new ComDaGroupItem(group, request.ItemId);
item.NodeId = m_mapper.GetRemoteNodeId(request.ItemId);
item.Active = request.Active;
item.ClientHandle = request.ClientHandle;
item.RequestedDataType = request.RequestedDataType;
item.SamplingRate = -1;
item.Deadband = -1;
// add attributes.
ReadValueId attributeToRead;
attributeToRead = new ReadValueId();
attributeToRead.NodeId = item.NodeId;
attributeToRead.AttributeId = Attributes.NodeClass;
attributesToRead.Add(attributeToRead);
attributeToRead = new ReadValueId();
attributeToRead.NodeId = item.NodeId;
attributeToRead.AttributeId = Attributes.DataType;
attributesToRead.Add(attributeToRead);
attributeToRead = new ReadValueId();
attributeToRead.NodeId = item.NodeId;
attributeToRead.AttributeId = Attributes.ValueRank;
attributesToRead.Add(attributeToRead);
attributeToRead = new ReadValueId();
attributeToRead.NodeId = item.NodeId;
attributeToRead.AttributeId = Attributes.UserAccessLevel;
attributesToRead.Add(attributeToRead);
}
// read attribute values from the server.
DataValueCollection results = null;
DiagnosticInfoCollection diagnosticInfos = null;
try
{
session.Read(
null,
0,
TimestampsToReturn.Neither,
attributesToRead,
out results,
out diagnosticInfos);
ClientBase.ValidateResponse(results, attributesToRead);
ClientBase.ValidateDiagnosticInfos(diagnosticInfos, attributesToRead);
}
catch (Exception e)
{
Utils.Trace(e, "Unexpected error reading attributes for items.");
// set default values on error.
for (int ii = start; ii < start + count && ii < requests.Length; ii++)
{
requests[ii].Error = ResultIds.E_INVALIDITEMID;
}
return;
}
// process results.
int first = 0;
for (int ii = start; ii < start + count && ii < requests.Length; ii++, first += 4)
{
ComDaGroupItem item = items[ii];
// verify node class.
NodeClass nodeClass = (NodeClass)results[first].GetValue <int>((int)NodeClass.Unspecified);
if (nodeClass != NodeClass.Variable)
{
requests[ii].Error = ResultIds.E_INVALIDITEMID;
continue;
}
// verify data type.
NodeId dataTypeId = results[first + 1].GetValue <NodeId>(null);
if (dataTypeId == null)
{
requests[ii].Error = ResultIds.E_INVALIDITEMID;
continue;
}
// get value rank.
int valueRank = results[first + 2].GetValue <int>(ValueRanks.Scalar);
// update datatypes.
BuiltInType builtInType = DataTypes.GetBuiltInType(dataTypeId, session.TypeTree);
item.RemoteDataType = new TypeInfo(builtInType, valueRank);
item.CanonicalDataType = (short)ComUtils.GetVarType(item.RemoteDataType);
// update access rights.
byte userAccessLevel = results[first + 3].GetValue <byte>(0);
if ((userAccessLevel & AccessLevels.CurrentRead) != 0)
{
item.AccessRights |= OpcRcw.Da.Constants.OPC_READABLE;
}
if ((userAccessLevel & AccessLevels.CurrentWrite) != 0)
{
item.AccessRights |= OpcRcw.Da.Constants.OPC_WRITEABLE;
}
}
}