private bool BuildBrowseStack(ItemIdentifier itemID, ItemIdentifier targetID)
{
BrowseFilters filters = new BrowseFilters {
MaxElementsReturned = 0,
BrowseFilter = browseFilter.all,
ElementNameFilter = null,
VendorFilter = null,
ReturnAllProperties = false,
PropertyIDs = null,
ReturnPropertyValues = false
};
BrowseElement[] elementArray = null;
Opc.Da.BrowsePosition position = null;
try
{
elementArray = this.m_server.Browse(itemID, filters, out position);
}
catch (Exception)
{
this.m_browseStack.Clear();
return(false);
}
if (position != null)
{
position.Dispose();
position = null;
}
if ((elementArray == null) || (elementArray.Length == 0))
{
this.m_browseStack.Clear();
return(false);
}
foreach (BrowseElement element in elementArray)
{
if (element.ItemName == targetID.ItemName)
{
return(true);
}
if (targetID.ItemName.StartsWith(element.ItemName))
{
ItemIdentifier identifier = new ItemIdentifier(targetID.ItemName);
this.m_browseStack.Push(identifier);
return(this.BuildBrowseStack(identifier, targetID));
}
}
return(false);
}
private BrowseElement FindChild(string name)
{
ItemIdentifier itemID = null;
if (this.m_browseStack.Count > 0)
{
itemID = (ItemIdentifier)this.m_browseStack.Peek();
}
BrowseElement[] elementArray = null;
try
{
BrowseFilters filters = new BrowseFilters {
MaxElementsReturned = 0,
BrowseFilter = browseFilter.all,
ElementNameFilter = name,
VendorFilter = null,
ReturnAllProperties = false,
PropertyIDs = null,
ReturnPropertyValues = false
};
Opc.Da.BrowsePosition position = null;
elementArray = this.m_server.Browse(itemID, filters, out position);
if (position != null)
{
position.Dispose();
position = null;
}
}
catch (Exception)
{
return(null);
}
if ((elementArray != null) && (elementArray.Length > 0))
{
return(elementArray[0]);
}
return(null);
}
/// <summary>
/// Returns the set of elements in the address space that meet the specified criteria.
/// </summary>
public Opc.Da.BrowseElement[] Browse(
ItemIdentifier itemID,
BrowseFilters filters,
ref Opc.Da.BrowsePosition position)
{
lock (this)
{
if (m_disposed)
{
throw new ObjectDisposedException("Opc.Da.Cache");
}
BrowseElement element = m_addressSpace;
// find desired element.
string browsePath = (itemID != null) ? itemID.ItemName : null;
if (browsePath != null && browsePath.Length > 0)
{
element = m_addressSpace.Find(browsePath);
if (element == null)
{
// check if browsing a property item.
PropertyID property = Property.VALUE;
string rootID = LookupProperty(browsePath, out property);
if (rootID != null)
{
element = m_addressSpace.Find(rootID);
}
if (element == null)
{
throw new ResultIDException(ResultID.Da.E_UNKNOWN_ITEM_NAME);
}
// property items never contain children.
return(new Opc.Da.BrowseElement[0]);
}
}
// check if no elements exist.
if (element.Count == 0)
{
return(new Opc.Da.BrowseElement[0]);
}
// determine start position.
int start = 0;
if (position != null)
{
start = ((BrowsePosition)position).Index;
position.Dispose();
position = null;
}
// process child nodes.
ArrayList results = new ArrayList();
for (int ii = start; ii < element.Count; ii++)
{
BrowseElement child = element.Child(ii);
// exclude elements without children.
if (filters.BrowseFilter == browseFilter.branch && child.Count == 0)
{
continue;
}
// check if an element is an item.
CacheItem item = (CacheItem)m_items[child.ItemID];
// exclude elements which are not items.
if (filters.BrowseFilter == browseFilter.item && item == null)
{
continue;
}
// apply name filter (using the SQL LIKE operator).
if (filters.ElementNameFilter != null && filters.ElementNameFilter.Length > 0)
{
if (!Opc.Convert.Match(child.Name, filters.ElementNameFilter, true))
{
continue;
}
}
// add element to list of results.
Opc.Da.BrowseElement result = new Opc.Da.BrowseElement();
result.Name = child.Name;
result.ItemName = child.ItemID;
result.ItemPath = null;
result.IsItem = item != null;
result.HasChildren = child.Count > 0;
result.Properties = null;
// add properties to results.
if (filters.ReturnAllProperties || filters.PropertyIDs != null)
{
result.Properties = GetProperties(item, (filters.ReturnAllProperties) ? null : filters.PropertyIDs, filters.ReturnPropertyValues);
}
results.Add(result);
// check if max elements exceeded.
if (filters.MaxElementsReturned > 0 && results.Count >= filters.MaxElementsReturned)
{
if (ii + 1 < element.Count)
{
position = new BrowsePosition(itemID, filters);
((BrowsePosition)position).Index = ii + 1;
}
break;
}
}
// return results.
return((Opc.Da.BrowseElement[])results.ToArray(typeof(Opc.Da.BrowseElement)));
}
}
private void Browse(ItemIdentifier itemID, OPCBROWSETYPE dwBrowseFilterType, string szFilterCriteria, short vtDataTypeFilter, int dwAccessRightsFilter, ArrayList hits)
{
BrowseFilters filters = new BrowseFilters {
MaxElementsReturned = 0,
BrowseFilter = browseFilter.all,
ElementNameFilter = (dwBrowseFilterType != OPCBROWSETYPE.OPC_FLAT) ? szFilterCriteria : "",
VendorFilter = null,
ReturnAllProperties = false
};
filters.PropertyIDs = new PropertyID[] { Property.DATATYPE, Property.ACCESSRIGHTS };
filters.ReturnPropertyValues = true;
BrowseElement[] elementArray = null;
try
{
Opc.Da.BrowsePosition position = null;
elementArray = this.m_server.Browse(itemID, filters, out position);
if (position != null)
{
position.Dispose();
position = null;
}
}
catch
{
throw new ExternalException("BrowseOPCItemIDs", -2147467259);
}
foreach (BrowseElement element in elementArray)
{
if (dwBrowseFilterType == OPCBROWSETYPE.OPC_FLAT)
{
if (element.HasChildren)
{
this.Browse(new ItemIdentifier(element.ItemName), dwBrowseFilterType, szFilterCriteria, vtDataTypeFilter, dwAccessRightsFilter, hits);
}
}
else
{
if (dwBrowseFilterType == OPCBROWSETYPE.OPC_BRANCH)
{
if (element.HasChildren)
{
goto Label_00F9;
}
continue;
}
if ((dwBrowseFilterType == OPCBROWSETYPE.OPC_LEAF) && element.HasChildren)
{
continue;
}
}
Label_00F9:
if (element.IsItem)
{
if (vtDataTypeFilter != 0)
{
short type = (short)OpcCom.Interop.GetType((System.Type)element.Properties[0].Value);
if (type != vtDataTypeFilter)
{
continue;
}
}
if (dwAccessRightsFilter != 0)
{
accessRights rights = (accessRights)element.Properties[1].Value;
if (((dwAccessRightsFilter == 1) && (rights == accessRights.writable)) || ((dwAccessRightsFilter == 2) && (rights == accessRights.readable)))
{
continue;
}
}
}
if (dwBrowseFilterType != OPCBROWSETYPE.OPC_FLAT)
{
hits.Add(element.Name);
}
else if (element.IsItem && ((szFilterCriteria.Length == 0) || Opc.Convert.Match(element.ItemName, szFilterCriteria, true)))
{
hits.Add(element.ItemName);
}
}
}
public void ChangeBrowsePosition(OPCBROWSEDIRECTION dwBrowseDirection, string szString)
{
OpcCom.Da.Wrapper.Server server;
Monitor.Enter(server = this);
try
{
BrowseElement element;
BrowseFilters filters = new BrowseFilters {
MaxElementsReturned = 0,
BrowseFilter = browseFilter.all,
ElementNameFilter = null,
VendorFilter = null,
ReturnAllProperties = false,
PropertyIDs = null,
ReturnPropertyValues = false
};
ItemIdentifier itemID = null;
Opc.Da.BrowsePosition position = null;
switch (dwBrowseDirection)
{
case OPCBROWSEDIRECTION.OPC_BROWSE_UP:
if (this.m_browseStack.Count == 0)
{
throw CreateException(-2147467259);
}
goto Label_0146;
case OPCBROWSEDIRECTION.OPC_BROWSE_DOWN:
if ((szString == null) || (szString.Length == 0))
{
throw CreateException(-2147024809);
}
goto Label_00F4;
case OPCBROWSEDIRECTION.OPC_BROWSE_TO:
if ((szString != null) && (szString.Length != 0))
{
break;
}
this.m_browseStack.Clear();
goto Label_0179;
default:
goto Label_0179;
}
itemID = new ItemIdentifier(szString);
BrowseElement[] elementArray = null;
try
{
elementArray = this.m_server.Browse(itemID, filters, out position);
}
catch (Exception)
{
throw CreateException(-2147024809);
}
if ((elementArray == null) || (elementArray.Length == 0))
{
throw CreateException(-2147024809);
}
this.m_browseStack.Clear();
this.m_browseStack.Push(null);
this.m_browseStack.Push(itemID);
goto Label_0179;
Label_00F4:
element = this.FindChild(szString);
if ((element == null) || !element.HasChildren)
{
throw CreateException(-2147024809);
}
this.m_browseStack.Push(new ItemIdentifier(element.ItemName));
goto Label_0179;
Label_0146:
itemID = (ItemIdentifier)this.m_browseStack.Pop();
if ((this.m_browseStack.Count > 0) && (this.m_browseStack.Peek() == null))
{
this.BuildBrowseStack(itemID);
}
Label_0179:
if (position != null)
{
position.Dispose();
position = null;
}
}
catch (Exception exception)
{
throw CreateException(exception);
}
finally
{
Monitor.Exit(server);
}
}
public void ChangeBrowsePosition(OPCBROWSEDIRECTION dwBrowseDirection, string szString)
{
lock (this)
{
try
{
BrowseFilters browseFilters = new BrowseFilters();
browseFilters.MaxElementsReturned = 0;
browseFilters.BrowseFilter = browseFilter.all;
browseFilters.ElementNameFilter = null;
browseFilters.VendorFilter = null;
browseFilters.ReturnAllProperties = false;
browseFilters.PropertyIDs = null;
browseFilters.ReturnPropertyValues = false;
ItemIdentifier itemIdentifier = null;
Opc.Da.BrowsePosition position = null;
switch (dwBrowseDirection)
{
case OPCBROWSEDIRECTION.OPC_BROWSE_TO:
{
if (szString == null || szString.Length == 0)
{
m_browseStack.Clear();
break;
}
itemIdentifier = new ItemIdentifier(szString);
BrowseElement[] array = null;
try
{
array = m_server.Browse(itemIdentifier, browseFilters, out position);
}
catch (Exception)
{
throw CreateException(-2147024809);
}
if (array == null || array.Length == 0)
{
throw CreateException(-2147024809);
}
m_browseStack.Clear();
m_browseStack.Push(null);
m_browseStack.Push(itemIdentifier);
break;
}
case OPCBROWSEDIRECTION.OPC_BROWSE_DOWN:
{
if (szString == null || szString.Length == 0)
{
throw CreateException(-2147024809);
}
BrowseElement browseElement = FindChild(szString);
if (browseElement == null || !browseElement.HasChildren)
{
throw CreateException(-2147024809);
}
m_browseStack.Push(new ItemIdentifier(browseElement.ItemName));
break;
}
case OPCBROWSEDIRECTION.OPC_BROWSE_UP:
if (m_browseStack.Count == 0)
{
throw CreateException(-2147467259);
}
itemIdentifier = (ItemIdentifier)m_browseStack.Pop();
if (m_browseStack.Count > 0 && m_browseStack.Peek() == null)
{
BuildBrowseStack(itemIdentifier);
}
break;
}
if (position != null)
{
position.Dispose();
position = null;
}
}
catch (Exception e)
{
throw CreateException(e);
}
}
}
