/// <summary>
/// Invokes callback for a read attributes request.
/// </summary>
private bool InvokeCallback(TsCHdaReadAttributesCompleteEventHandler callback, object results)
{
// check for valid result type.
if (!typeof(TsCHdaItemAttributeCollection).IsInstanceOfType(results))
{
return(false);
}
TsCHdaItemAttributeCollection values = (TsCHdaItemAttributeCollection)results;
// update item handles and actual times.
UpdateResults(new TsCHdaItemAttributeCollection[] { values });
try
{
callback(this, values);
}
catch
{
// ignore exceptions in the callbacks.
}
// request always completes
return(true);
}
/// <summary>
/// Called when a read request completes.
/// </summary>
public void OnReadComplete(IOpcRequest request, TsCHdaItemAttributeCollection results)
{
// check if dialog has closed.
if (IsDisposed)
{
return;
}
// check if invoke is required.
if (InvokeRequired)
{
BeginInvoke(new TsCHdaReadAttributesCompleteEventHandler(OnReadComplete), new object[] { request, results });
return;
}
try
{
// enable next button since first batch of results have arrived.
ResultsCTRL.Initialize(m_server, results);
m_results = results;
NextBTN.Enabled = true;
}
catch (Exception exception)
{
MessageBox.Show(exception.Message);
}
}
/// <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.
Technosoftware.DaAeHdaClient.Hda.TsCHdaAttributeValueCollection[] results = new Technosoftware.DaAeHdaClient.Hda.TsCHdaAttributeValueCollection[pAttributeValues.Length];
for (int ii = 0; ii < pAttributeValues.Length; ii++)
{
results[ii] = Interop.GetAttributeValueCollection(pAttributeValues[ii], false);
results[ii].Result = Technosoftware.DaAeHdaClient.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>
/// Displays the results of a read attributes request.
/// </summary>
public void Initialize(TsCHdaServer server, TsCHdaItemAttributeCollection results)
{
mServer_ = server;
attributesLv_.Items.Clear();
if (results != null)
{
foreach (Technosoftware.DaAeHdaClient.Hda.TsCHdaAttributeValueCollection result in results)
{
AddListItem(result);
}
AdjustColumns();
}
}
/// <summary>
/// Displays the results of a read attributes request.
/// </summary>
public void Initialize(TsCHdaServer server, TsCHdaItemAttributeCollection results)
{
m_server = server;
AttributesLV.Items.Clear();
if (results != null)
{
foreach (OpcClientSdk.Hda.TsCHdaAttributeValueCollection result in results)
{
AddListItem(result);
}
AdjustColumns();
}
}
/// <summary>
/// Remove server handles for new items.
/// </summary>
private void UndoRead()
{
m_results = null;
m_asyncSent = false;
if (m_request != null)
{
m_server.CancelRequest(m_request, new TsCHdaCancelCompleteEventHandler(OnCancelComplete));
m_request = null;
}
if (!m_fixedItem)
{
m_attributeIDs = null;
m_item = null;
}
}
/// <summary>
/// Remove server handles for new items.
/// </summary>
private void UndoRead()
{
mResults_ = null;
mAsyncSent_ = false;
if (mRequest_ != null)
{
mServer_.CancelRequest(mRequest_, new TsCHdaCancelCompleteEventHandler(OnCancelComplete));
mRequest_ = null;
}
if (!mFixedItem_)
{
mAttributeIDs_ = null;
mItem_ = null;
}
}
/// <summary>
/// Creates a server handle for the selected item and reads the data.
/// </summary>
private void DoItemRead()
{
// get the attribute ids.
if (m_attributeIDs == null)
{
m_attributeIDs = AttributesCTRL.GetAttributeIDs(true);
return;
}
// create item (if necessary).
TsCHdaItem item = m_trend.Items[m_item];
if (item == null)
{
item = m_trend.AddItem(m_item);
}
// get the paramaters.
TrendCTRL.Update(m_trend);
// get the attributes.
m_attributeIDs = AttributesCTRL.GetAttributeIDs(true);
if (m_synchronous)
{
// read data.
TsCHdaItemAttributeCollection results = m_trend.ReadAttributes(item, m_attributeIDs);
if (results == null || results.Count != m_attributeIDs.Length)
{
////throw new InvalidResponseException();
}
// display results.
ResultsCTRL.Initialize(m_server, results);
// save results.
m_results = results;
}
else
{
// check if already waiting for results.
if (m_asyncSent)
{
return;
}
// begin read data.
TsCHdaResultCollection results = m_trend.ReadAttributes(
item,
m_attributeIDs,
null,
new TsCHdaReadAttributesCompleteEventHandler(OnReadComplete),
out m_request);
if (results == null || results.Count != m_attributeIDs.Length)
{
////throw new InvalidResponseException();
}
// display initial results.
AsyncResultsCTRL.Initialize(m_server, m_attributeIDs, results);
m_asyncSent = true;
}
}
/// <summary>
/// Creates a server handle for the selected item and reads the data.
/// </summary>
private void DoItemRead()
{
// get the attribute ids.
if (mAttributeIDs_ == null)
{
mAttributeIDs_ = attributesCtrl_.GetAttributeIDs(true);
return;
}
// create item (if necessary).
TsCHdaItem item = mTrend_.Items[mItem_];
if (item == null)
{
item = mTrend_.AddItem(mItem_);
}
// get the paramaters.
trendCtrl_.Update(mTrend_);
// get the attributes.
mAttributeIDs_ = attributesCtrl_.GetAttributeIDs(true);
if (mSynchronous_)
{
// read data.
TsCHdaItemAttributeCollection results = mTrend_.ReadAttributes(item, mAttributeIDs_);
if (results == null || results.Count != mAttributeIDs_.Length)
{
////throw new InvalidResponseException();
}
// display results.
resultsCtrl_.Initialize(mServer_, results);
// save results.
mResults_ = results;
}
else
{
// check if already waiting for results.
if (mAsyncSent_)
{
return;
}
// begin read data.
TsCHdaResultCollection results = mTrend_.ReadAttributes(
item,
mAttributeIDs_,
null,
new TsCHdaReadAttributesCompleteEventHandler(OnReadComplete),
out mRequest_);
if (results == null || results.Count != mAttributeIDs_.Length)
{
////throw new InvalidResponseException();
}
// display initial results.
asyncResultsCtrl_.Initialize(mServer_, mAttributeIDs_, results);
mAsyncSent_ = true;
}
}
