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Upgrading 5.23 to 2016.2 Deprecated Item handle

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support
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29 Jun 2017 18:07 #5301 by support

Replied by support on topic Upgrading 5.23 to 2016.2 Deprecated Item handle

Hello,

this is explained here: opclabs.doc-that.com/files/onlinedocs/QuickOpc/2016.2/User%2...y%20subscribed%20entities.html

Best regards

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Damian999
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29 Jun 2017 17:59 - 29 Jun 2017 18:06 #5299 by Damian999

Upgrading 5.23 to 2016.2 Deprecated Item handle was created by Damian999

We are trying to upgrade our OPC comms layer from QuickOPC v5.23 to v 2016.2

We are getting compile errors with this line var subscribedItem = e.Handle; (see snippet below)

Complile Error "'EasyDAItemChangedEventArgs' does not contain a definition for 'Handle' and no extension method 'Handle' accepting a first argument of type 'EasyDAItemChangedEventArgs' could be found (are you missing a using directive or an assembly reference?)"

When we subscribe to an OPC tag using the SubscribeItem method we get back a unique integer that identifies this subscription.

We want to use the subscription identifier in the TagValueChangedCallback method. How can we access this identifier if e.Handle method is now obsolete?

private void TagValueChangedCallback(object sender, EasyDAItemChangedEventArgs e)
    {
        Debug.WriteLine(e.ToString());
 
        TagValueChangedCallback tagValueChangedCallback = null;
 
        try
        {
 
            var subscribedItem = [b]e.Handle;[/b]
            tagValueChangedCallback = _callbacks[subscribedItem];
        }
        catch (KeyNotFoundException)
        {
        }

Thanks
Damian

Last edit: 29 Jun 2017 18:06 by support.

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