Opc data Access Automation Specification

4.1.5.9

 

LookupItemIDs  

Description 

Return a list of ItemIDs (if available) for each of the passed ID codes.  These indicate the ItemID, 

which could be added to an OPCGroup and used for more efficient access to the data 

corresponding to the Item Properties. An error within the error array may indicate that the passed 

Property ID is not defined for this item. 

Syntax 

LookupItemIDs (ItemID As String, Count As Long, PropertyIDs() as Long, ByRef NewItemIDs() 

As String, ByRef Errors () As Long) 

 

ItemID 

The ItemID for which the caller wants to lookup the list of 

properties 

Count 

The number of properties passed 

PropertyIDs  DWORD ids for the requested properties. These IDs were 

returned by QueryAvailableProperties 

27 

 

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OPC Data Access Automation Specification2.02 

NewItemID

s 

The returned list of ItemIDs. 

Errors 

Error array indicating whether each New ItemID was 

returned. 

 

Example 

Dim OPCItemID as String 

Dim Count As Long 

Dim PropertyIDs(1) as Long 

Dim NewItemIDs () as String 

Dim Errors() as Long 

Dim AnOPCTextSting As String 

OPCItemID = “SomeOPCDataAccessItem” 

Count = 1 

PropertyIDs(1) = 5; 

AnOPCServer.LookupItemIDs (OPCItemID, Count, PropertyIDs, NewItemIDs, Errors) 

For i = 1 To Count 

 

AnOPCTextSting = Str(PropertyIDs(i) + “ “ + NewItemIDs(i) 

    listbox.AddItem AnOPCTextSting 

Next i