Hello,

I was able to discover the cause of the cast error. In another class I was subscribing to the tag and trying to cast it as a byte[,]. Once I removed it, the error disappeared. It runs perfectly fine now.

I do ignore the value only because I use the subscribe function to notify my program when a change was made in the data of the array tag. Then I call "OnCamArrayChange()" to update my list. I guess I could use the generic object as well to update my list.

Thank you!

If it is blurry I screenshot it closer

This is the expanded version as requested. It just repeats the data.




This is what is inside OnCamArrayChange method. It just reads elements from tags and updates a list.

Hello,

I am not trying to cast anything which is why I am confused. I just want the subscription to call a function using the callback when it notices a change in the Array of array tag.

What is inside the delegate is the code I pass in this:
By "console output" I meant what shows in the debug output. It is the cast error I wrote in my first message.
Error:
Exception thrown: 'System.InvalidCastException' in PacScreensRmg.exe
OpcLabs.EventTracing.LogEntries Error: 1 : LogEntry("OPCLabs-EasyUAClient",Error,0,101). CALLBACK ERROR. An exception of type "System.InvalidCastException" from source "PacScreensRmg" has occurred in callback 'System.EventHandler`1[OpcLabs.EasyOpc.UA.OperationModel.EasyUADataChangeNotificationEventArgs]'. The exception descend follows. (0) System.InvalidCastException PacScreensRmg (<.ctor>b__79_5) -> Unable to cast object of type 'OpcLabs.EasyOpc.UA.ComplexData.UAGenericObject[]' to type 'System.Byte[,]'.

Contents of e.AttributeData.Value:

Hello,

I am trying to create a subscription to an array of array tag, The array has 101 elements and inside each of those elements is 4 other elements. The goal is that anytime a change is made in one of those elements inside the array, I want it to call a function named OnCamArrayChange(). I am using the SubscribeDataChange function. The subscription seems to work however on the console output I am receiving an invalid cast error. I have tried to cast UAGenericObject in the delegate and byte[ , ] but it keeps giving that same error. Below is the error I receive and I have included the code it calls.

Cast Error:
Exception thrown: 'System.InvalidCastException' in PacScreensRmg.exe
OpcLabs.EventTracing.LogEntries Error: 1 : LogEntry("OPCLabs-EasyUAClient",Error,0,101). CALLBACK ERROR. An exception of type "System.InvalidCastException" from source "PacScreensRmg" has occurred in callback 'System.EventHandler`1[OpcLabs.EasyOpc.UA.OperationModel.EasyUADataChangeNotificationEventArgs]'. The exception descend follows. (0) System.InvalidCastException PacScreensRmg (<.ctor>b__79_5) -> Unable to cast object of type 'OpcLabs.EasyOpc.UA.ComplexData.UAGenericObject[]' to type 'System.Byte[,]'.

Code:
- Gets called in a constructor within a class

 

camArrayHandle = OpcClient.Get().SubscribeToTag(Tags.GenV_Cam_Array, value => {

        OnCamArrayChange();

});

 

 

- Within a created OpcClient class

 

public delegate void OnTagChanged(object Value);

 

public int SubscribeToTag(string nodeId, OnTagChanged onTagChanged)

{

    if (IsInitialized)

    {

       return easyUAClient1.SubscribeDataChange(Tags.ENDPOINT_DESCRIPTOR, nodeId, 1, (_, e) =>

        {

          if (e.AttributeData != null && e.AttributeData.HasValue)

          {

            onTagChanged(e.AttributeData.Value;);

          }

        });

      }

      else return NO_BINDING;

}

 

Thank you