OPC Historian .NET Server Toolkit Reference
ReadProcessed Method (IAppPlugin)
| I_HDAPluginNet4 Assembly > I_HDAPlugin Namespace > IAppPlugin Interface : ReadProcessed Method |
| Overload | Description |
|---|---|
| ReadProcessed(DateTime,DateTime,TimeSpan,Int32[],Int32[],OPCHDAItem[],Int32[]) | Synchronous ReadProcessed. This method computes aggregate values, qualities, and timestamps from data in the history database for the specified time domain for one or more items. The time domain is divided into subintervals of duration resampleInterval. The specified aggregate is calculated for each subinterval beginning with startTime by using the data within the next resampleInterval. This method is intended to provide values calculated with respect to the resample interval. For example, This method can provide hourly statistics such as Maximum, Minimum, Average, etc. for each item during the specified time domain when resampleInterval is 1 hour. |
| ReadProcessed(Int32,DateTime,DateTime,TimeSpan,Int32[],Int32[],Int32,Int32[]) | Asynchronous ReadProcessed. This method computes aggregate values, qualities, and timestamps from data in the history database for the specified time domain for one or more items. The time domain is divided into subintervals of duration resampleInterval. The specified aggregate is calculated for each subinterval beginning with startTime by using the data within the next resampleInterval. This method is intended to provide values calculated with respect to the resample interval. For example, This method can provide hourly statistics such as Maximum, Minimum, Average, et. al. for each item during the specified time domain when resampleInterval is 1 hour. The results are returned via the client's IOPCHDA_DataCallback::OnReadComplete method. |
Target Platforms: Windows 7, Windows Vista SP1 or later, Windows XP SP3, Windows Server 2008 (Server Core not supported), Windows Server 2008 R2 (Server Core supported with SP1 or later), Windows Server 2003 SP2