Initializes a new instance of the class. Initializes a new instance of the class, with the OPC server specified by machine name and server class, the OPC item specified by its ItemId, the OPC group parameters specified by requested update rate, user-defined state object, and with a typed callback method.
Syntax
'Declaration
Public Function New( _
ByVal As String, _
ByVal As String, _
ByVal As String, _
ByVal As Integer, _
ByVal As OpcLabs.EasyOpc.DataAccess.Generic.EasyDAItemChangedEventHandler(Of T), _
ByVal As Object _
)
'Usage
Dim machineName As String
Dim serverClass As String
Dim itemId As String
Dim requestedUpdateRate As Integer
Dim callback As OpcLabs.EasyOpc.DataAccess.Generic.EasyDAItemChangedEventHandler(Of T)
Dim state As Object
Dim instance As New EasyDAItemSubscriptionArguments(Of T)(machineName, serverClass, itemId, requestedUpdateRate, callback, state)
public EasyDAItemSubscriptionArguments<T>(
string ,
string ,
string ,
int ,
OpcLabs.EasyOpc.DataAccess.Generic.EasyDAItemChangedEventHandler<T> ,
object
)
public:
EasyDAItemSubscriptionArguments<T>(
String^ ,
String^ ,
String^ ,
int ,
OpcLabs.EasyOpc.DataAccess.Generic.EasyDAItemChangedEventHandler<T^>^ ,
Object^
)
Parameters
- machineName
- Name of the machine. Determines the computer on which the OPC server is located. May be an empty string, in which case the OPC server is assumed to exist on the local computer or at the computer specified for it by DCOM configuration.
- serverClass
- Contains ProgID of the OPC server.
- itemId
- Contains OPC item identifier.
- requestedUpdateRate
- How often should the updates be received (number of milliseconds).
- callback
- A typed callback method to be invoked for each significant item change.
- state
- The state object (can be any value supplied by your code); available in event notifications.
Requirements
Target Platforms: .NET Framework: Windows 10 (selected versions), Windows 11 (selected versions), Windows Server 2016, Windows Server 2022; .NET: Linux, macOS, Microsoft Windows
See Also