'Usage
 
Dim instance As AppPlugin
Dim startTime As Date
Dim endTime As Date
Dim interval As TimeSpan
Dim serverHandles() As Integer
Dim aggregates() As Integer
Dim itemValues As OPCHDAItem()
Dim errors As Integer()
Dim value As Integer
 
value = instance.ReadProcessed(startTime, endTime, interval, serverHandles, aggregates, itemValues, errors)

public int ReadProcessed( 
   DateTime startTime,
   DateTime endTime,
   TimeSpan interval,
   int[] serverHandles,
   int[] aggregates,
   out OPCHDAItem[] itemValues,
   out int[] errors
)

Parameters

startTime

The beginning of the history period to be read.

endTime

The end of the history period to be read.

interval

Interval between returned values.

serverHandles

The list of server item handles for the items to be read.

aggregates

The calculation to be performed on the raw data to create the values to be returned.

itemValues

OUT: Array of objects in which the item values are returned. The order of the objects in the array shall be the same as the order of the server item handles.

errors

Array of HRESULTs indicating the success of the individual item reads. The errors correspond to the handles passed in phServer. This indicates whether the read succeeded in obtaining defined values, qualities and timestamps. NOTE any FAILED error code indicates that the contents of the corresponding OPCHDAItem structure are UNDEFINED.

Return Value

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

Reference

AppPlugin Class
AppPlugin Members
Overload List