Hi,

See the code below that generates the exception. This is when we call the GetDataTypePropertyValue() function.

If Form1.DaItemDialog1.ShowDialog() = DialogResult.OK Then
TagName = Form1.DaItemDialog1.NodeElement.ItemId
Dim value As Object = Nothing
Dim exception As Exception = Nothing
Try ' Catch the exception May-29-2017
value = easyDAClient.GetDataTypePropertyValue("", server_properties.RealServerName, TagName)
Catch ex As OpcException
exception = ex
sTagType = ""
DisplayOPCException(exception)
End Try

Can you please try it?

Thank you.

Michael

Hi,

This is the link for the OPC server.
spaces.hightail.com/receive/nQQeTqbcZshttps://spaces.hightail.com/receive/nQQeTqbcZs

Thank you.

Regards,

Michael

The invalid class string happens with our program.
The crash at startup happens with the Easy OPC Client.

Please focus on the first problem. I tried using the Easy OPC Client only because I wanted to check if I get the same error with it.

Thanks.
Michael

Hi,

Thank you for your answer. See my answers below.

1. Is the operating system 32-bit or 64-bit? 64 bit.

2. If the OS is 64-bit, is your application built to AnyCPU, x86 or x64? Our application is 32 bit (x86).

3. Do you set EnableNativeClient to false? Where can I set this property?

4. Is the problem only with browsing items? Have you tried reading etc.? After browsing and selecting an OPC item, our OPC client reads the value.

5. Have you tried other OPC clients? Which? Do they work? Matrikon Explorer works fine. Easy OPC Client crashes at startup. See the attached screen capture.

6. Does it happen only on one computer with this server, or more, or you do not know? "More than one computer"

7. How was the ProgID (Intellution.IntellutionGatewayOPCServer) obtained? Using QuickOPC browsing dialog as well? No. Using OPC Expert software.

8. Can you post here the CLSID of the server? (should be visible in the Browse Servers dialog or similar) - looks like {..............................}. (the idea is then to try with CLSID directly, will provide more details later) {6e6617109-ff2d-11d2-8087-00105aa8f840}

9. Is there a way to obtain the demo of the server? I can try.

10. Which version of Intellution OPC gateway is it? 7.68

Thank you.
Michael