OPC Historian .NET Server Toolkit Reference
ReadAnnotations(Int32,DateTime,DateTime,Int32[],Int32,Int32[]) Method

An identifier created by the client and passed to the server in this call. The server shall return this identifier along with the results of this call.
The beginning of the history period to be read.
The end of the history period to be read.
The list of server item handles for the annotation items to be read.
Place to return a Server generated ID to be used in case the operation needs to be canceled.
Array of HRESULTs indicating whether the corresponding server handle was valid.
Professional Edition only.
This function reads the annotations from the history database in the specified time domain for the specified item IDs. This method is intended to read annotations for an item at specified timestamps. OPC_S_NODATA is returned only if no annotations exist over the time domain.
Syntax
'Usage
 
Dim instance As AppPlugin
Dim transactionID As Integer
Dim startTime As Date
Dim endTime As Date
Dim serverHnd() As Integer
Dim cancelID As Integer
Dim errors As Integer()
Dim value As Integer
 
value = instance.ReadAnnotations(transactionID, startTime, endTime, serverHnd, cancelID, errors)
public int ReadAnnotations( 
   int transactionID,
   DateTime startTime,
   DateTime endTime,
   int[] serverHnd,
   out int cancelID,
   out int[] errors
)

Parameters

transactionID
An identifier created by the client and passed to the server in this call. The server shall return this identifier along with the results of this call.
startTime
The beginning of the history period to be read.
endTime
The end of the history period to be read.
serverHnd
The list of server item handles for the annotation items to be read.
cancelID
Place to return a Server generated ID to be used in case the operation needs to be canceled.
errors
Array of HRESULTs indicating whether the corresponding server handle was valid.

Return Value

HRESULTS success/error code.
Requirements

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

See Also

Reference

AppPlugin Class
AppPlugin Members
Overload List

 

 


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