This asynchronous function reads the annotations from the history database in the specified time domain for the specified item IDs.
This function is intended to read annotations for an item at specified timestamps.
The results are returned via the client's ReadAnnotations event handler.
Overload List
| Overload | Description |
|---|---|
| ReadAnnotations(Int32,OPCHDAtime,OPCHDAtime,Int32[],Int32,Int32[]) | This asynchronous function reads the annotations from the history database in the specified time domain for the specified item IDs. This function is intended to read annotations for an item at specified timestamps. The results are returned via the client's ReadAnnotations event handler. |
| ReadAnnotations(OPCHDAtime,OPCHDAtime,Int32[],OPCHDAannotation[],Int32[]) | This synchronous function reads the annotations from the history database in the specified time domain for the specified item IDs. This function is intended to read annotations for an item at specified timestamps. |
Requirements
Target Platforms: Windows 7/8/10, Windows Server 2008/2012/2016, .NET 4.x