/// <summary>
/// Unmarshals and deallocates an array of OPCHDA_ATTRIBUTE structures.
/// </summary>
internal static TsCHdaAttributeValueCollection[] GetAttributeValueCollections(ref IntPtr pInput, int count, bool deallocate)
{
TsCHdaAttributeValueCollection[] output = null;
if (pInput != IntPtr.Zero && count > 0)
{
output = new TsCHdaAttributeValueCollection[count];
IntPtr pos = pInput;
for (int ii = 0; ii < count; ii++)
{
output[ii] = GetAttributeValueCollection(pos, deallocate);
pos = (IntPtr)(pos.ToInt64() + Marshal.SizeOf(typeof(OpcRcw.Hda.OPCHDA_ATTRIBUTE)));
}
if (deallocate)
{
Marshal.FreeCoTaskMem(pInput);
pInput = IntPtr.Zero;
}
}
return(output);
}
/// <summary>
/// Called when an asynchronous read attributes request completes.
/// </summary>
public void OnReadAttributeComplete(
int dwTransactionID,
int hrStatus,
int hClient,
int dwNumItems,
OPCHDA_ATTRIBUTE[] pAttributeValues,
int[] phrErrors)
{
try
{
lock (this)
{
// lookup request transaction.
Request request = (Request)m_requests[dwTransactionID];
if (request == null)
{
return;
}
// create item object to collect results.
TsCHdaItemAttributeCollection item = new TsCHdaItemAttributeCollection();
item.ServerHandle = hClient;
// unmarshal results.
TsCHdaAttributeValueCollection[] results = new TsCHdaAttributeValueCollection[pAttributeValues.Length];
for (int ii = 0; ii < pAttributeValues.Length; ii++)
{
results[ii] = Interop.GetAttributeValueCollection(pAttributeValues[ii], false);
results[ii].Result = Utilities.Interop.GetResultId(phrErrors[ii]);
item.Add(results[ii]);
}
// invoke callback - remove request if all results arrived.
if (request.InvokeCallback(item))
{
m_requests.Remove(request.RequestID);
}
}
}
catch (Exception exception)
{
HandleException(dwTransactionID, exception);
}
}
/// <summary>
/// Unmarshals and deallocates an OPCHDA_ATTRIBUTE structure.
/// </summary>
internal static TsCHdaAttributeValueCollection GetAttributeValueCollection(IntPtr pInput, bool deallocate)
{
TsCHdaAttributeValueCollection output = null;
if (pInput != IntPtr.Zero)
{
object item = Marshal.PtrToStructure(pInput, typeof(OpcRcw.Hda.OPCHDA_ATTRIBUTE));
output = GetAttributeValueCollection((OpcRcw.Hda.OPCHDA_ATTRIBUTE)item, deallocate);
if (deallocate)
{
Marshal.DestroyStructure(pInput, typeof(OpcRcw.Hda.OPCHDA_ATTRIBUTE));
}
}
return(output);
}
/// <summary>
/// Unmarshals and deallocates an OPCHDA_ATTRIBUTE structure.
/// </summary>
internal static TsCHdaAttributeValueCollection GetAttributeValueCollection(OpcRcw.Hda.OPCHDA_ATTRIBUTE input, bool deallocate)
{
TsCHdaAttributeValueCollection output = new TsCHdaAttributeValueCollection();
output.AttributeID = input.dwAttributeID;
object[] values = Com.Interop.GetVARIANTs(ref input.vAttributeValues, input.dwNumValues, deallocate);
DateTime[] timestamps = Utilities.Interop.GetDateTimes(ref input.ftTimeStamps, input.dwNumValues, deallocate);
for (int ii = 0; ii < input.dwNumValues; ii++)
{
TsCHdaAttributeValue value = new TsCHdaAttributeValue();
value.Value = values[ii];
value.Timestamp = timestamps[ii];
output.Add(value);
}
return(output);
}
