public OPCITEMRESULT[] AddItems(
OPCITEMDEF[] itemDefinitions,
out HRESULT[] errors)
{
var _errors = new HRESULT[itemDefinitions.Length];
OPCITEMRESULT[] result = DoComCall(ComObject, "IOPCItemMgt::AddItems", () =>
{
IntPtr ppAddResults;
ComObject.AddItems(itemDefinitions.Length, itemDefinitions, out ppAddResults, out _errors);
OPCITEMRESULT[] opcDaItemResults = ArrayHelpers.CreateOpcItemResults(itemDefinitions, ppAddResults);
Marshal.FreeCoTaskMem(ppAddResults);
return opcDaItemResults;
}, itemDefinitions.Length, itemDefinitions);
errors = _errors;
return result;
}
internal OPCITEMDEF ToStruct()
{
var itemDef = new OPCITEMDEF();
itemDef.szItemID = ItemId;
itemDef.bActive = IsActive ? 1 : 0;
itemDef.hClient = 0;
itemDef.szAccessPath = AccessPath;
itemDef.vtRequestedDataType = (short) TypeConverter.ToVarEnum(RequestedDataType);
if (Blob != null)
{
itemDef.dwBlobSize = Blob.Length;
itemDef.pBlob = Marshal.AllocCoTaskMem(Blob.Length*Marshal.SizeOf(typeof (byte)));
Marshal.Copy(Blob, 0, itemDef.pBlob, Blob.Length);
}
else
{
itemDef.dwBlobSize = 0;
itemDef.pBlob = IntPtr.Zero;
}
return itemDef;
}
public static OPCITEMDEF[] CreateOPITEMDEFs(IList<OpcDaItemDefinition> opcItemDefinitions)
{
var pItemArray = new OPCITEMDEF[opcItemDefinitions.Count];
for (int i = 0; i < opcItemDefinitions.Count; i++)
{
pItemArray[i] = opcItemDefinitions[i].ToStruct();
}
return pItemArray;
}
public static OPCITEMRESULT[] CreateOpcItemResults(OPCITEMDEF[] pItemArray, IntPtr ppAddResults)
{
var results = new OPCITEMRESULT[pItemArray.Length];
for (int i = 0; i < pItemArray.Length; i++)
{
IntPtr current = ppAddResults + i*Marshal.SizeOf(typeof (OPCITEMRESULT));
results[i] = (OPCITEMRESULT) Marshal.PtrToStructure(current, typeof (OPCITEMRESULT));
Marshal.DestroyStructure(current, typeof (OPCITEMRESULT));
Marshal.FreeCoTaskMem(pItemArray[i].pBlob); // Delete allocated blobs
}
return results;
}