Opc data Access Automation Specification

4.5.4.5

 

Remove  

Description 

 Removes an OPCItem  

Syntax 

 Remove (Count As Long, ServerHandles() As Long, ByRef Errors() As Long) 

Part Description 

Count 

The number of items to be removed 

ServerHandles 

Array of server item handles for the items processed 

Errors 

Array of Long’s indicating the success of the individual items 

operation.  

Example 

AnOPCItemCollection.Remove  AnOPCItemServerHandles, AnOPCItemServerErrors 

‘ add code to process any errors that are returned from ‘the method, individual errors are reported in 

the Errors array 

4.5.4.6

 

Validate  

Description 

Determines if one or more OPCItems could be successfully created via the Add method (but does 

not add them). 

Syntax 

Validate (Count As Long, ItemIDs() As String, ByRef Errors() As Long, Optional  

RequestedDataTypes As Variant, Optional AccessPaths As Variant) 

 

Part Description 

Count 

The number of items to be affected 

ItemIDs 

Array of Fully Qualified ItemID’s 

Errors 

Array of Long’s indicating the success of the individual items 

operation.  

RequestedDataTypes  Variant containing an integer array of Requested DataTypes. 

AccessPaths 

Variant containing a string array of Access Path’s. 

 

See Also 

Appendix A - OPC Automation Error Handling 

Appendix D- Notes On Automation Data Types 

68 

 

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OPC Data Access Automation Specification2.02 

Example 

Dim addItemCount as long 

Dim AnOPCItemIDs() as String 

Dim AnOPCItemServerHandles as long 

Dim AnOPCItemServerErrors as long 

Dim AnOPCRequestedDataTypes as variant 

Dim AnOPCAccessPathss as variant 

 

For  x = 1 To AddItemCount 

 

ClientHandles(x)  

= x + 1 

 

AnOPCItemID(x) = “Register_”  &  x 

Next x 

AnOPCItemCollection.Validate AddItemCount, AnOPCItemIDs, AnOPCItemServerErrors, 

AnOPCRequestedDataTypes, AnOPCAccessPathss 

 

‘ add code to process any errors that are returned from ‘the method, individual errors are reported in 

the Errors array