OPCDA.NET Reference Manual
Read(ItemDef,Int32,Int32) Method
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OpcDaNetUA.Net4 Assembly > OPCDA.NET Namespace > RefreshGroup Class > Read Method : Read(ItemDef,Int32,Int32) Method

idef
IN: ItemDef item definition object
TransactionId
This value is returned in the ReadComplete callback to allow the value to be associated with the Read call.
CancelId
OUT: Cancel id code

Glossary Item Box

Read the current value of the item specified by the ItemDef object. An asynchronous OpcGroup read call is executed. The value is returned in the ReadComplete callback handler.
The returned cancel ID can be used to cancel the call execution.

Syntax

Visual Basic (Declaration) 
Public Overloads Function Read( _
   ByVal idef As ItemDef, _
   ByVal TransactionId As Integer, _
   ByRef CancelId As Integer _
) As Integer
C# 
public int Read( 
   ItemDef idef,
   int TransactionId,
   out int CancelId
)

Parameters

idef
IN: ItemDef item definition object
TransactionId
This value is returned in the ReadComplete callback to allow the value to be associated with the Read call.
CancelId
OUT: Cancel id code

Requirements

Target Platforms: Windows 7/8/10, Windows Server 2003/2008/2012/2016, .NET 4.x

See Also

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