/// <summary>
/// Invokes callback for a read annotations request.
/// </summary>
private bool InvokeCallback(ReadAnnotationsEventHandler callback, object results)
{
// check for valid result type.
if (!typeof(AnnotationValueCollection[]).IsInstanceOfType(results))
{
return(false);
}
AnnotationValueCollection[] values = (AnnotationValueCollection[])results;
// update item handles and actual times.
UpdateResults(values);
try
{
callback(this, values);
}
catch
{
// ignore exceptions in the callbacks.
}
// request always completes
return(true);
}
/// <summary>
/// Starts an asynchronous read annotations request for all items in the trend.
/// </summary>
public IdentifiedResult[] ReadAnnotations(
object requestHandle,
ReadAnnotationsEventHandler callback,
out IRequest request)
{
return(ReadAnnotations(GetItems(), requestHandle, callback, out request));
}
/// <summary>
/// Starts an asynchronous read annotations request for a set of items.
/// </summary>
public IdentifiedResult[] ReadAnnotations(
Item[] items,
object requestHandle,
ReadAnnotationsEventHandler callback,
out IRequest request)
{
IdentifiedResult[] results = m_server.ReadAnnotations(
StartTime,
EndTime,
items,
requestHandle,
callback,
out request);
return(results);
}
private bool InvokeCallback(ReadAnnotationsEventHandler callback, object results)
{
if (!typeof(AnnotationValueCollection[]).IsInstanceOfType(results))
{
return(false);
}
AnnotationValueCollection[] valuesArray = (AnnotationValueCollection[])results;
this.UpdateResults(valuesArray);
try
{
callback(this, valuesArray);
}
catch
{
}
return(true);
}
/// <summary>
/// Sends an asynchronous request to read the annotations for a set of items.
/// </summary>
/// <param name="startTime">The beginning of the history period to read.</param>
/// <param name="endTime">The end of the history period to be read.</param>
/// <param name="items">The set of items to read (must include the server handle).</param>
/// <param name="requestHandle">An identifier for the request assigned by the caller.</param>
/// <param name="callback">A delegate used to receive notifications when the request completes.</param>
/// <param name="request">An object that contains the state of the request (used to cancel the request).</param>
/// <returns>A set of results containing any errors encountered when the server validated the items.</returns>
public IdentifiedResult[] ReadAnnotations(
Time startTime,
Time endTime,
ItemIdentifier[] items,
object requestHandle,
ReadAnnotationsEventHandler callback,
out IRequest request)
{
if (m_server == null)
{
throw new NotConnectedException();
}
IdentifiedResult[] results = ((IServer)m_server).ReadAnnotations(
startTime,
endTime,
items,
requestHandle,
callback,
out request);
return(results);
}
public IdentifiedResult[] ReadAnnotations(Item[] items, object requestHandle, ReadAnnotationsEventHandler callback, out IRequest request)
{
return(this.m_server.ReadAnnotations(this.StartTime, this.EndTime, items, requestHandle, callback, out request));
}
public IdentifiedResult[] ReadAnnotations(Time startTime, Time endTime, ItemIdentifier[] items, object requestHandle, ReadAnnotationsEventHandler callback, out IRequest request)
{
if (base.m_server == null)
{
throw new NotConnectedException();
}
return(((Opc.Hda.IServer)base.m_server).ReadAnnotations(startTime, endTime, items, requestHandle, callback, out request));
}
