/// <summary>
/// Reads the raw data history.
/// </summary>
/// <param name="request">The request.</param>
public StatusCode ReadHistory(HdaHistoryReadRawModifiedRequest request)
{
// check if nothing to do.
if (request == null)
{
return StatusCodes.BadNothingToDo;
}
HdaItem[] items = GetItems(request.ItemId);
if (items == null || items[0].Error < 0)
{
return StatusCodes.BadNodeIdUnknown;
}
request.ServerHandle = items[0].ServerHandle;
try
{
if (request.IsReadModified)
{
return ReadModified(request);
}
return ReadRaw(request);
}
catch (Exception)
{
return StatusCodes.BadUnexpectedError;
}
finally
{
ReleaseItemHandles(request.ServerHandle);
request.ServerHandle = 0;
}
}
/// <summary>
/// Reads the raw data for an item.
/// </summary>
private StatusCode ReadRaw(HdaHistoryReadRawModifiedRequest request)
{
string methodName = "IOPCHDA_SyncRead.ReadRaw";
OPCHDA_TIME htStartTime = ConvertTime(request.StartTime);
OPCHDA_TIME htEndTime = ConvertTime(request.EndTime);
int maxReturnValues = request.MaxReturnValues;
if (m_maxReturnValues > 0 && maxReturnValues > m_maxReturnValues)
{
maxReturnValues = m_maxReturnValues;
}
// must have a least two values.
if (request.MaxReturnValues == 1 && request.TotalValuesReturned > 0)
{
maxReturnValues = 2;
}
IntPtr ppItemValues;
IntPtr ppErrors;
try
{
IOPCHDA_SyncRead server = BeginComCall<IOPCHDA_SyncRead>(methodName, true);
server.ReadRaw(
ref htStartTime,
ref htEndTime,
maxReturnValues,
(request.ReturnBounds)?1:0,
1,
new int[] { request.ServerHandle },
out ppItemValues,
out ppErrors);
}
catch (Exception e)
{
ComCallError(methodName, e);
return StatusCodes.BadUnexpectedError;
}
finally
{
EndComCall(methodName);
}
// check for error.
int[] errors = ComUtils.GetInt32s(ref ppErrors, 1, true);
if (errors[0] < 0)
{
return StatusCodes.BadNodeIdUnknown;
}
// check if operation halted.
request.Completed = errors[0] != ResultIds.S_MOREDATA;
// unmarshal the results.
OPCHDA_ITEM result = (OPCHDA_ITEM)Marshal.PtrToStructure(ppItemValues, typeof(OPCHDA_ITEM));
if (result.dwCount > 0)
{
object[] values = ComUtils.GetVARIANTs(ref result.pvDataValues, result.dwCount, true);
int[] qualities = ComUtils.GetInt32s(ref result.pdwQualities, result.dwCount, true);
DateTime[] timestamps = ComUtils.GetDateTimes(ref result.pftTimeStamps, result.dwCount, true);
request.Results = new DataValueCollection(result.dwCount);
for (int ii = 0; ii < result.dwCount; ii++)
{
// suppress previously returned values.
if (ii == 0 && request.TotalValuesReturned > 0)
{
if (request.StartTime < request.EndTime && timestamps[ii] <= request.StartTime)
{
continue;
}
if (request.StartTime > request.EndTime && timestamps[ii] >= request.StartTime)
{
continue;
}
}
DataValue value = new DataValue();
value.Value = ComUtils.ProcessComValue(values[ii]);
value.StatusCode = ComUtils.GetHdaQualityCode(Utils.ToUInt32(qualities[ii]));
value.SourceTimestamp = timestamps[ii];
request.Results.Add(value);
}
request.TotalValuesReturned += request.Results.Count;
if (!request.Completed)
{
request.StartTime = request.Results[request.Results.Count-1].SourceTimestamp;
}
}
Marshal.FreeCoTaskMem(ppItemValues);
if (result.dwCount == 0)
{
return StatusCodes.GoodNoData;
}
if (maxReturnValues > 0 && !request.Completed)
{
return StatusCodes.GoodMoreData;
}
return StatusCodes.Good;
}
/// <summary>
/// Reads the raw modified data for an item.
/// </summary>
private StatusCode ReadModified(HdaHistoryReadRawModifiedRequest request)
{
string methodName = "IOPCHDA_SyncRead.ReadModified";
OPCHDA_TIME htStartTime = ConvertTime(request.StartTime);
OPCHDA_TIME htEndTime = ConvertTime(request.EndTime);
int maxReturnValues = request.MaxReturnValues;
if (m_maxReturnValues > 0 && maxReturnValues > m_maxReturnValues)
{
maxReturnValues = m_maxReturnValues;
}
IntPtr ppItemValues;
IntPtr ppErrors;
try
{
IOPCHDA_SyncRead server = BeginComCall<IOPCHDA_SyncRead>(methodName, true);
server.ReadModified(
ref htStartTime,
ref htEndTime,
maxReturnValues,
1,
new int[] { request.ServerHandle },
out ppItemValues,
out ppErrors);
}
catch (Exception e)
{
if (ComUtils.IsUnknownError(e, ResultIds.E_NOTIMPL))
{
ComCallError(methodName, e);
}
return StatusCodes.BadNoData;
}
finally
{
EndComCall(methodName);
}
// check for error.
int[] errors = ComUtils.GetInt32s(ref ppErrors, 1, true);
if (errors[0] < 0)
{
return StatusCodes.BadNodeIdUnknown;
}
// check if operation halted.
request.Completed = errors[0] != ResultIds.S_MOREDATA;
// unmarshal the results.
OPCHDA_MODIFIEDITEM result = (OPCHDA_MODIFIEDITEM)Marshal.PtrToStructure(ppItemValues, typeof(OPCHDA_MODIFIEDITEM));
if (result.dwCount > 0)
{
object[] values = ComUtils.GetVARIANTs(ref result.pvDataValues, result.dwCount, true);
int[] qualities = ComUtils.GetInt32s(ref result.pdwQualities, result.dwCount, true);
DateTime[] timestamps = ComUtils.GetDateTimes(ref result.pftTimeStamps, result.dwCount, true);
DateTime[] modificationTimes = ComUtils.GetDateTimes(ref result.pftModificationTime, result.dwCount, true);
string[] userNames = ComUtils.GetUnicodeStrings(ref result.szUser, result.dwCount, true);
int[] editTypes = ComUtils.GetInt32s(ref result.pEditType, result.dwCount, true);
request.Results = new DataValueCollection(result.dwCount);
request.ModificationInfos = new ModificationInfoCollection(result.dwCount);
for (int ii = 0; ii < result.dwCount; ii++)
{
DataValue value = new DataValue();
value.Value = ComUtils.ProcessComValue(values[ii]);
value.StatusCode = ComUtils.GetHdaQualityCode(Utils.ToUInt32(qualities[ii]));
value.SourceTimestamp = timestamps[ii];
request.Results.Add(value);
ModificationInfo modification = new ModificationInfo();
modification.ModificationTime = modificationTimes[ii];
modification.UpdateType = (HistoryUpdateType)editTypes[ii];
modification.UserName = userNames[ii];
request.ModificationInfos.Add(modification);
}
if (!request.Completed)
{
request.StartTime = request.Results[request.Results.Count-1].SourceTimestamp;
}
}
Marshal.FreeCoTaskMem(ppItemValues);
if (result.dwCount == 0)
{
return StatusCodes.GoodNoData;
}
if (maxReturnValues > 0 && !request.Completed)
{
return StatusCodes.GoodMoreData;
}
return StatusCodes.Good;
}
/// <summary>
/// Reads the history of an HDA item.
/// </summary>
private ServiceResult HistoryReadItem(
ServerSystemContext context,
ComHdaClient client,
ReadRawModifiedDetails details,
TimestampsToReturn timestampsToReturn,
HistoryReadValueId nodeToRead,
HdaParsedNodeId parsedNodeId,
HistoryReadResult result)
{
// create the request or load it from a continuation point.
HdaHistoryReadRawModifiedRequest request = null;
if (nodeToRead.ContinuationPoint == null)
{
request = new HdaHistoryReadRawModifiedRequest(parsedNodeId.RootId, details, nodeToRead);
}
else
{
request = LoadContinuationPoint(context, nodeToRead.ContinuationPoint) as HdaHistoryReadRawModifiedRequest;
if (request == null)
{
return StatusCodes.BadContinuationPointInvalid;
}
}
// fetch the data.
result.StatusCode = client.ReadHistory(request);
// fill in the results.
if (request.Results != null)
{
HistoryData data = (request.IsReadModified)?new HistoryModifiedData():new HistoryData();
if (request.IsReadModified)
{
((HistoryModifiedData)data).ModificationInfos = request.ModificationInfos;
}
data.DataValues = request.Results;
result.HistoryData = new ExtensionObject(data);
}
// create a new continuation point.
if (!request.Completed)
{
result.ContinuationPoint = SaveContinuationPoint(context, request);
}
return result.StatusCode;
}
