Opc data Access Automation Specification

4.1.5.8

 

GetItemProperties  

Description 

Return a list of the current data values for the passed ID codes.  

Syntax 

GetItemProperties (ItemID As String, Count As Long, ByRef PropertyIDs() as Long, ByRef 

PropertyValues() As Variant, ByRef Errors() As Long) 

 

Part Description 

ItemID 

 

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

properties 

Count 

The number of properties passed 

PropertyIDs 

DWORD ids for the requested properties. These IDs 

26 

 

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OPC Data Access Automation Specification2.02 

were returned by QueryAvailableProperties or obtained 

from the fixed list described earlier. 

PropertyValue

s 

An array of size Count VARIANTS returned by the 

server, which contain the current values of the requested 

properties. 

Errors 

Error array indicating whether each property was 

returned. 

 

Example 

Dim OPCItemID as String 

Dim ItemCount As Long 

Dim PropertyIDs(3) as Long 

Dim Data() as Variant 

Dim Errors() as Long 

Dim AnOPCTextSting As String 

‘ Set values for ItemCount and PropertyIDs… 

AnOPCServer.GetItemProperties (OPCItemID, ItemCount, PropertyIDs, Data, Errors) 

For i = 1 To ItemCount 

 

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

    listbox.AddItem AnOPCTextSting 

Next i