Hello.

SubscribeMultipleMonitoredItems returns an array of handles (integers), not a TStringList. And, the array of handles returned from SubscribeMultipleMonitoredItems should be directly usable as the input array to UnsubscribeMultipleMonitoredItems, precisely as it is shown in the example referenced before. If that somehow does not work in Delphi, let me know.

If you only want to unsubscribe *some* tags from the whole set made by SubscribeMultipleMonitoredItems: The positions (indexes) of the handles in the returned array are the same as those in the input arguments array. So, the handles for argument 0 is at index 0, handle for argument 1 is at index 1, etc. So, you can pick the ones you want, create a new array of integer handles, and pass that to UnsubscribeMultipleMonitoredItems .

What do you mean by subscribeidlist? Where and how do you get it from?

Hello.

Can you please be more specific? - I do not quite understand what the issue is. Did you mean this example: opclabs.doc-that.com/files/onlinedocs/QuickOpc/Latest/User%2...tiple%20monitored%20items.html

- and do you want to do the same in Delphi, or is your problem different?

Best regards