public virtual BrowseElement[] BrowseNext(ref Opc.Da.BrowsePosition position)
{
lock (this)
{
if (m_server == null)
{
throw new NotConnectedException();
}
if (position == null || (object)position.GetType() != typeof(BrowsePosition))
{
throw new BrowseCannotContinueException();
}
BrowsePosition browsePosition = (BrowsePosition)position;
if (browsePosition == null || browsePosition.ContinuationPoint == null || browsePosition.ContinuationPoint == "")
{
throw new BrowseCannotContinueException();
}
int pdwCount = 0;
int pbMoreElements = 0;
ItemIdentifier itemID = ((BrowsePosition)position).ItemID;
BrowseFilters filters = ((BrowsePosition)position).Filters;
IntPtr pszContinuationPoint = Marshal.StringToCoTaskMemUni(browsePosition.ContinuationPoint);
IntPtr ppBrowseElements = IntPtr.Zero;
try
{
((IOPCBrowse)m_server).Browse((itemID != null && itemID.ItemName != null) ? itemID.ItemName : "", ref pszContinuationPoint, filters.MaxElementsReturned, Interop.GetBrowseFilter(filters.BrowseFilter), (filters.ElementNameFilter != null) ? filters.ElementNameFilter : "", (filters.VendorFilter != null) ? filters.VendorFilter : "", filters.ReturnAllProperties ? 1 : 0, filters.ReturnPropertyValues ? 1 : 0, (filters.PropertyIDs != null) ? filters.PropertyIDs.Length : 0, Interop.GetPropertyIDs(filters.PropertyIDs), out pbMoreElements, out pdwCount, out ppBrowseElements);
}
catch (Exception e)
{
throw OpcCom.Interop.CreateException("IOPCBrowse.BrowseNext", e);
}
BrowseElement[] browseElements = Interop.GetBrowseElements(ref ppBrowseElements, pdwCount, deallocate: true);
browsePosition.ContinuationPoint = Marshal.PtrToStringUni(pszContinuationPoint);
Marshal.FreeCoTaskMem(pszContinuationPoint);
if (pbMoreElements == 0 && (browsePosition.ContinuationPoint == null || browsePosition.ContinuationPoint == ""))
{
position = null;
}
ProcessResults(browseElements, filters.PropertyIDs);
return(browseElements);
}
}
public virtual BrowseElement[] Browse(ItemIdentifier itemID, BrowseFilters filters, out Opc.Da.BrowsePosition position)
{
if (filters == null)
{
throw new ArgumentNullException("filters");
}
lock (this)
{
if (m_server == null)
{
throw new NotConnectedException();
}
position = null;
int pdwCount = 0;
int pbMoreElements = 0;
IntPtr pszContinuationPoint = IntPtr.Zero;
IntPtr ppBrowseElements = IntPtr.Zero;
try
{
((IOPCBrowse)m_server).Browse((itemID != null && itemID.ItemName != null) ? itemID.ItemName : "", ref pszContinuationPoint, filters.MaxElementsReturned, Interop.GetBrowseFilter(filters.BrowseFilter), (filters.ElementNameFilter != null) ? filters.ElementNameFilter : "", (filters.VendorFilter != null) ? filters.VendorFilter : "", filters.ReturnAllProperties ? 1 : 0, filters.ReturnPropertyValues ? 1 : 0, (filters.PropertyIDs != null) ? filters.PropertyIDs.Length : 0, Interop.GetPropertyIDs(filters.PropertyIDs), out pbMoreElements, out pdwCount, out ppBrowseElements);
}
catch (Exception e)
{
throw OpcCom.Interop.CreateException("IOPCBrowse.Browse", e);
}
BrowseElement[] browseElements = Interop.GetBrowseElements(ref ppBrowseElements, pdwCount, deallocate: true);
string text = Marshal.PtrToStringUni(pszContinuationPoint);
Marshal.FreeCoTaskMem(pszContinuationPoint);
if (pbMoreElements != 0 || (text != null && text != ""))
{
position = new BrowsePosition(itemID, filters, text);
}
ProcessResults(browseElements, filters.PropertyIDs);
return(browseElements);
}
}
