private void OnDataChange(int TransactionID, int NumItems, ref Array clientHandles, ref Array itemValues, ref Array qualities, ref Array timeStamps)
{
// 服务端异常退出后, 可能还会有残留的回调, 丢弃
if (!_isOpcConnected)
{
return;
}
for (int i = 1; i < NumItems + 1; i++)
{
try
{
int clientHandle = Convert.ToInt32(clientHandles.GetValue(i));
OpcTag opcTag = null;
lock (_tagClientHandleIndex)
_tagClientHandleIndex.TryGetValue(clientHandle, out opcTag);
if (opcTag == null)
{
continue;
}
object value = itemValues.GetValue(i);
int quality = Convert.ToInt32(qualities.GetValue(i));
DateTime timeStamp = Convert.ToDateTime(timeStamps.GetValue(i));
opcTag.Set(value, quality, timeStamp);
}
catch { }
}
}
// 枚举 OPC 服务器中所有标签
private void BuildGroupsAndTags()
{
_client.OPCGroups.DefaultGroupIsActive = true;
_client.OPCGroups.DefaultGroupDeadband = _defaultGroupDeadband;
_client.OPCGroups.DefaultGroupUpdateRate = _updateRate;
// 准备批量创建节点
List <string> listItemIds = new List <string>();
List <int> listClientHandles = new List <int>();
int itemHandle = 1;
int itemCount = 0;
// 批量创建时, 数组标号从 1 开始, 0 位无用
listItemIds.Add("");
listClientHandles.Add(0);
// 枚举节点
OPCBrowser opcBrowser = _client.CreateBrowser();
opcBrowser.ShowBranches();
opcBrowser.ShowLeafs(true);
foreach (object turn in opcBrowser)
{
string name = turn.ToString();
if (string.IsNullOrEmpty(name))
{
continue;
}
// 过滤系统变量
if (name.StartsWith("_") || name.IndexOf("._") > 0)
{
continue;
}
listItemIds.Add(name);
listClientHandles.Add(itemHandle++);
itemCount++;
}
// 创建组和节点
_group = _client.OPCGroups.Add("RootGroup");
Array itemIds = listItemIds.ToArray();
Array clientHandles = listClientHandles.ToArray();
_group.OPCItems.AddItems(itemCount, ref itemIds, ref clientHandles, out Array serverHandles, out Array errors);
// 创建标签
for (int i = 1; i < itemCount + 1; i++)
{
string itemName = Convert.ToString(itemIds.GetValue(i));
int clientHandle = Convert.ToInt32(clientHandles.GetValue(i));
int serverHandle = Convert.ToInt32(serverHandles.GetValue(i));
OpcTag opcTag = new OpcTag(itemName, clientHandle, serverHandle);
lock (_tagNamedIndex)
_tagNamedIndex[itemName] = opcTag;
lock (_tagClientHandleIndex)
_tagClientHandleIndex[clientHandle] = opcTag;
lock (_tagServerHandleIndex)
_tagServerHandleIndex[serverHandle] = opcTag;
}
// 启用订阅
_group.IsSubscribed = true;
_group.DataChange += OnDataChange;
// 从客户端缓存读取一次, 获取初始值
itemCount = _group.OPCItems.Count;
_group.SyncRead((short)OPCDataSource.OPCCache, itemCount, ref serverHandles, out Array values, out errors, out object qualities, out object timeStamps);
for (int i = 1; i < itemCount + 1; i++)
{
int serverHandle = Convert.ToInt32(serverHandles.GetValue(i));
OpcTag opcTag = null;
lock (_tagServerHandleIndex)
_tagServerHandleIndex.TryGetValue(serverHandle, out opcTag);
if (opcTag == null)
{
continue;
}
object value = values.GetValue(i);
int quality = Convert.ToInt32(((Array)qualities).GetValue(i));
DateTime timeStamp = Convert.ToDateTime(((Array)timeStamps).GetValue(i));
opcTag.Set(value, quality, timeStamp);
}
// 从设备异步读取一次
_group.AsyncRefresh((short)OPCDataSource.OPCDevice, 1001, out int cancelId);
}
