/// <summary>
/// Reads the item values and stores the results in the request object.
/// </summary>
/// <param name="requests">The requests.</param>
public void ReadItemValues(List <ReadRequest> requests)
{
ComDaGroup group = new ComDaGroup(this, false);
try
{
int count1 = 0;
GroupItem[] items = new GroupItem[requests.Count];
ReadRequest[] addItemRequests = new ReadRequest[requests.Count];
// create the items in the temporary group.
for (int ii = 0; ii < requests.Count; ii++)
{
ReadRequest request = requests[ii];
if (request == null)
{
continue;
}
if (!request.ValueRequired)
{
continue;
}
// add the item.
items[count1] = group.CreateItem(request.ItemId, 0, 0, true);
addItemRequests[count1] = request;
count1++;
}
// create the items on the server.
group.ApplyChanges();
// build the list of values to write.
int count2 = 0;
int[] serverHandles = new int[count1];
ReadRequest[] readRequests = new ReadRequest[count1];
for (int ii = 0; ii < count1; ii++)
{
// check for error on create.
GroupItem item = items[ii];
ReadRequest request = addItemRequests[ii];
if (item.ErrorId < 0)
{
request.Value.Error = item.ErrorId;
continue;
}
serverHandles[count2] = item.ServerHandle;
readRequests[count2] = request;
count2++;
}
// write values to the server.
DaValue[] values = group.SyncRead(serverHandles, count2);
// read the values.
for (int ii = 0; ii < count2; ii++)
{
readRequests[ii].Value = values[ii];
}
}
finally
{
// delete the group and items.
group.Delete();
}
}
/// <summary>
/// Writes the item values to servers.
/// </summary>
/// <param name="requests">The requests.</param>
private void WriteItemValues(List <WriteRequest> requests)
{
ComDaGroup group = new ComDaGroup(this, false);
try
{
int count1 = 0;
GroupItem[] items = new GroupItem[requests.Count];
WriteRequest[] addItemRequests = new WriteRequest[requests.Count];
// create the items in the temporary group.
for (int ii = 0; ii < requests.Count; ii++)
{
WriteRequest request = requests[ii];
if (request == null)
{
continue;
}
// status code writes not supported.
if (request.Value.StatusCode != StatusCodes.Good)
{
request.Error = ResultIds.E_NOTSUPPORTED;
continue;
}
// timestamp writes not supported.
if (request.Value.SourceTimestamp != DateTime.MinValue)
{
request.Error = ResultIds.E_NOTSUPPORTED;
continue;
}
// add the item.
items[count1] = group.CreateItem(request.ItemId, 0, 0, true);
addItemRequests[count1] = request;
count1++;
}
// create the items on the server.
group.ApplyChanges();
// build the list of values to write.
int count2 = 0;
int[] serverHandles = new int[count1];
object[] values = new object[count1];
WriteRequest[] writeRequests = new WriteRequest[count1];
for (int ii = 0; ii < count1; ii++)
{
// check for error on create.
GroupItem item = items[ii];
WriteRequest request = addItemRequests[ii];
if (item.ErrorId < 0)
{
request.Error = item.ErrorId;
continue;
}
serverHandles[count2] = item.ServerHandle;
values[count2] = ComUtils.GetVARIANT(request.Value.Value);
writeRequests[count2] = request;
count2++;
}
// write values to the server.
int[] errors = group.SyncWrite(serverHandles, values, count2);
// read the errors.
for (int ii = 0; ii < count2; ii++)
{
writeRequests[ii].Error = errors[ii];
}
}
finally
{
// delete the group and items.
group.Delete();
}
}