OPC Studio User's Guide and Reference
ReadItem Method (IEasyDAClientExtension2)



OpcLabs.EasyOpcClassicCore Assembly > OpcLabs.EasyOpc.DataAccess.Extensions Namespace > IEasyDAClientExtension2 Class : ReadItem Method
Reads a typed named item from an OPC server. A typed value, quality and timestamp are returned.

The ReadItem method uses the first available data from the server; it does not wait until the quality becomes "uncertain" or "good".

The server(s) can be local or can be remotely accessed via DCOM.

Overload List
OverloadDescription
ReadItem<TValue>(IEasyDAClient,ServerDescriptor,DANodeDescriptor)Reads a typed named item using descriptor objects for the OPC server and OPC-DA item.  
ReadItem<TValue>(IEasyDAClient,ServerDescriptor,DANodeDescriptor,DAReadParameters)Reads a typed named item using descriptor objects for the OPC server and OPC-DA item, and specifying read parameters such as the data source or value age.  
ReadItem<TValue>(IEasyDAClient,String,String,String)Reads a typed named item using individual parameters specifying its location, and a specific data type.  
ReadItem<TValue>(IEasyDAClient,String,String,String,Int32)Reads a typed named item using individual parameters specifying its location, and value age.  
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

Reference

IEasyDAClientExtension2 Class
IEasyDAClientExtension2 Members

 

 

Copyright © 2004-2024 CODE Consulting and Development, s.r.o., Plzen. All rights reserved. Web page: www.opclabs.com

Documentation Home, Send Feedback. Resources: Knowledge Base, Product Downloads. Technical support: Online Forums, FAQ.

Missing some example? Ask us for it on our Online Forums! You do not have to own a commercial license in order to use Online Forums, and we reply to every post.