QuickOPC User's Guide and Reference
WriteItemValue(IEasyDAClient,ServerDescriptor,DAItemDescriptor,Object) Method



OpcLabs.EasyOpcClassic Assembly > OpcLabs.EasyOpc.DataAccess Namespace > IEasyDAClientExtension Class > WriteItemValue Method : WriteItemValue(IEasyDAClient,ServerDescriptor,DAItemDescriptor,Object) Method
The client object that will perform the operation.
The OPC server involved in the operation.
The OPC item involved in the operation.
The value to be written.
Writes a value into a named item in an OPC server. Only the item value is written (quality and timestamp are not written). Writes a value into a named item using descriptor objects for the OPC server and OPC-DA item.
Syntax
'Declaration
 

<ExtensionAttribute()>
Public Overloads Shared Sub WriteItemValue( _
   ByVal client As IEasyDAClient, _
   ByVal serverDescriptor As ServerDescriptor, _
   ByVal itemDescriptor As DAItemDescriptor, _
   ByVal value As Object _
) 
'Usage
 

Dim client As IEasyDAClient
Dim serverDescriptor As ServerDescriptor
Dim itemDescriptor As DAItemDescriptor
Dim value As Object
 
IEasyDAClientExtension.WriteItemValue(client, serverDescriptor, itemDescriptor, value)
[Extension()]
public static void WriteItemValue( 
   IEasyDAClient client,
   ServerDescriptor serverDescriptor,
   DAItemDescriptor itemDescriptor,
   object value
)
[Extension()]
public:
static void WriteItemValue( 
   IEasyDAClient^ client,
   ServerDescriptor^ serverDescriptor,
   DAItemDescriptor^ itemDescriptor,
   Object^ value
)

Parameters

client
The client object that will perform the operation.
serverDescriptor
The OPC server involved in the operation.
itemDescriptor
The OPC item involved in the operation.
value
The value to be written.
Exceptions
ExceptionDescription
OpcLabs.EasyOpc.OperationModel.OpcExceptionThrown when the OPC operation fails.
System.ArgumentNullExceptionA null reference (Nothing in Visual Basic) is passed to a method that does not accept it as a valid argument.
Remarks

The server can be local or can be remotely accessed via DCOM. Optionally, an access path can be specified or a specific data type can be requested.

Requirements

Target Platforms: .NET Framework: Windows 10 (selected versions), Windows 11 (selected versions), Windows Server 2012, Windows Server 2016; .NET Core, .NET 5, .NET 6: Linux, macOS, Microsoft Windows

See Also

Reference

IEasyDAClientExtension Class
IEasyDAClientExtension Members
Overload List

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