Read a set of items with the items identified by the server handle that was returned in a previous AddItems call.
The item values are read by executing an asynchronous read and returned to the user as an argument of the completion handler.
Syntax
| Visual Basic (Declaration) | |
|---|---|
Public Overloads Sub Read( _ ByVal serverHandles() As Integer, _ ByVal tag As Object, _ ByVal onCompleted As OnBGGrpRead _ ) | |
| C# | |
|---|---|
public void Read( int[] serverHandles, object tag, OnBGGrpRead onCompleted ) | |
Parameters
- serverHandles
- Array of server handles as they were returned in previous AddItems calls.
- tag
- This object is passed to the competion handler and allows the user to pass any information that may be needed in the completion handler. Nothing (null) can be specified if the application does not require to pass any information.
- onCompleted
- Completion notification handler. void xxx( BGException ex, int[] requestErrors, OPCItemState[] rslt, object tag ){}