This asynchronous function reads the values and qualities from the history database for the specified timestamps for one or more items.
This function is intended to provide values to correlate with other values with a known timestamp. For example, the values of sensors when lab samples were collected.
The results are returned via the client's ReadComplete event handler.
Overload List
| Overload | Description |
|---|---|
| ReadAtTime(Int32,DateTime[],Int32[],Int32,Int32[]) | This asynchronous function reads the values and qualities from the history database for the specified timestamps for one or more items. This function is intended to provide values to correlate with other values with a known timestamp. For example, the values of sensors when lab samples were collected. The results are returned via the client's ReadComplete event handler. |
| ReadAtTime(DateTime[],Int32[],OPCHDAitem[],Int32[]) | This synchronous function reads the values and qualities from the history database for the specified timestamps for one or more items. This function is intended to provide values to correlate with other values with a known timestamp. For example, the values of sensors when lab samples were collected. |
Requirements
Target Platforms: Windows 7/8/10, Windows Server 2008/2012/2016, .NET 4.x