Online Forums

Technical support is provided through Support Forums below. Anybody can view them; you need to Register/Login to our site (see links in upper right corner) in order to Post questions. You do not have to be a licensed user of our product.

Please read Rules for forum posts before reporting your issue or asking a question. OPC Labs team is actively monitoring the forums, and replies as soon as possible. Various technical information can also be found in our Knowledge Base. For your convenience, we have also assembled a Frequently Asked Questions page.

Do not use the Contact page for technical issues.

× If you are developing in .NET, but are using the OPC-UA (OPC Unified Architecture), please post in the QuickOPC-UA category instead.

Upgrading 5.23 to 2016.2 Deprecated Item handle

Start
Prev
1
Next
End

1

support
Offline
Moderator

More

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

Please Log in or Create an account to join the conversation.

Damian999
Topic Author
Offline
Senior Member

More

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.

Please Log in or Create an account to join the conversation.

Start
Prev
1
Next
End

1

Moderators: support

Time to create page: 0.043 seconds

Powered by Kunena Forum

Joomla SEF URLs by Artio