public BrowseResult[] Browse(string ItemId)
{
if (!m_connected)
{
throw new InvalidOperationException("Not connected to OPC-Server!");
}
BrowseResult[] ret = null;
IntPtr pContinuationPoint = IntPtr.Zero;
int MaxElementsReturned = 10; // There is no client side restriction on the number of returned elements.
int MoreElements = 0;
int BrowseElementCount = 0;
IntPtr BrowseElements = new IntPtr(1);
int[] PropertyIds = new int[1];
try
{
m_browserDA3.Browse(
ItemId,
ref pContinuationPoint,
MaxElementsReturned,
OPCBROWSEFILTER.OPC_BROWSE_FILTER_ALL,
"", // no name filter
"", // no vendow filter
1, // return all properties
1, // return property values
0, // Property count, is ignored since all properties are returned
PropertyIds, //array of property ids, is ignored since all properties are returned
out MoreElements,
out BrowseElementCount,
out BrowseElements);
OpcRcw.Da.OPCBROWSEELEMENT[] elements = GetBrowseElements(BrowseElements, BrowseElementCount);
ret = new BrowseResult[BrowseElementCount];
int i = 0;
foreach (OpcRcw.Da.OPCBROWSEELEMENT element in elements)
{
OpcRcw.Da.OPCITEMPROPERTIES ItemProperties = element.ItemProperties;
IntPtr Properties = ItemProperties.pItemProperties;
int PropertyCount = ItemProperties.dwNumProperties;
ret[i++] = new BrowseResult
{
ItemId = element.szItemID,
ItemName = element.szName,
ItemProperties = GetItemProperties(Properties, PropertyCount)
};
}
}
catch (Exception e)
{
throw e;
}
return(ret);
}
/// <summary>
/// IOPCBrowse::GetProperties - Returns an array of OPCITEMPROPERTIES, one for each ItemID.
/// </summary>
public void GetProperties(
int dwItemCount,
string[] pszItemIDs,
int bReturnPropertyValues,
int dwPropertyCount,
int[] pdwPropertyIDs,
out System.IntPtr ppItemProperties)
{
lock (m_lock)
{
try
{
if (dwItemCount == 0 || pszItemIDs == null)
{
throw ComUtils.CreateComException("E_INVALIDARG", ResultIds.E_INVALIDARG);
}
ppItemProperties = IntPtr.Zero;
OPCITEMPROPERTIES[] results = new OPCITEMPROPERTIES[dwItemCount];
for (int ii = 0; ii < dwItemCount; ii++)
{
// initialize result.
OPCITEMPROPERTIES result = new OPCITEMPROPERTIES();
result.hrErrorID = ResultIds.S_OK;
result.dwReserved = 0;
result.dwNumProperties = 0;
result.pItemProperties = IntPtr.Zero;
// lookup item id.
NodeId nodeId = ItemIdToNodeId(pszItemIDs[ii]);
if (nodeId == null)
{
result.hrErrorID = ResultIds.E_INVALIDITEMID;
continue;
}
// find node.
INode node = m_session.NodeCache.FetchNode(nodeId);
if (node == null)
{
result.hrErrorID = ResultIds.E_UNKNOWNITEMID;
continue;
}
// get properties.
List<ItemProperty> properties = GetItemProperties(
node,
false,
pdwPropertyIDs,
bReturnPropertyValues != 0);
// marshal properties.
result = GetItemProperties(properties);
}
ppItemProperties = GetItemProperties(results);
}
catch (Exception e)
{
throw ComUtils.CreateComException(e);
}
}
}
/// <summary>
/// Allocates and marshals an array of OPCITEMPROPERTIES structures.
/// </summary>
internal static OpcRcw.Da.OPCITEMPROPERTIES GetItemProperties(IList<ItemProperty> input)
{
OpcRcw.Da.OPCITEMPROPERTIES output = new OpcRcw.Da.OPCITEMPROPERTIES();
if (input != null && input.Count > 0)
{
output.hrErrorID = ResultIds.S_OK;
output.dwReserved = 0;
output.dwNumProperties = input.Count;
output.pItemProperties = Marshal.AllocCoTaskMem(Marshal.SizeOf(typeof(OpcRcw.Da.OPCITEMPROPERTY))*input.Count);
bool error = false;
IntPtr pos = output.pItemProperties;
for (int ii = 0; ii < input.Count; ii++)
{
OpcRcw.Da.OPCITEMPROPERTY property = GetItemProperty(input[ii]);
Marshal.StructureToPtr(property, pos, false);
pos = (IntPtr)(pos.ToInt32() + Marshal.SizeOf(typeof(OpcRcw.Da.OPCITEMPROPERTY)));
if (input[ii].ErrorId < 0)
{
error = true;
}
}
// set flag indicating one or more properties contained errors.
if (error)
{
output.hrErrorID = ResultIds.S_FALSE;
}
}
return output;
}
