//======================================================================
// Private Methods
/// <summary>
/// Sends data change notifications for all active items.
/// </summary>
private void OnDataChange(ItemValueResultList items)
{
lock (this)
{
if (m_callback != null)
{
m_callback(m_state.ClientHandle, null, (ItemValueResult[])items.ToArray(typeof(ItemValueResult)));
}
}
}
//======================================================================
// Read
/// <summary>
/// Reads the current values for a set of items.
/// </summary>
/// <param name="items">The set of items to read.</param>
/// <returns>The results of the read operation for each item.</returns>
public Opc.Da.ItemValueResult[] Read(Item[] items)
{
if (items == null)
{
throw new ArgumentNullException("items");
}
if (items.Length == 0)
{
return(new Opc.Da.ItemValueResult[0]);
}
lock (this)
{
if (m_proxy == null)
{
throw new NotConnectedException();
}
ItemList list = new ItemList();
list.AddRange(items);
OpcXml.Da10.RequestOptions options = OpcXml.Da10.Request.GetRequestOptions(m_options.Locale, m_options.Filters);
OpcXml.Da10.ReadRequestItemList requestList = OpcXml.Da10.Request.GetItemList(list);
OpcXml.Da10.ReplyItemList replyList = null;
OpcXml.Da10.OPCError[] errors = null;
OpcXml.Da10.ReplyBase reply = m_proxy.Read(
options,
requestList,
out replyList,
out errors);
CacheResponse(m_options.Locale, reply, errors);
ItemValueResultList valueList = OpcXml.Da10.Request.GetResultList(replyList);
if (valueList == null)
{
throw new InvalidResponseException();
}
return((ItemValueResult[])valueList.ToArray(typeof(ItemValueResult)));
}
}
