remote opc c++ dll

[daHans]

Hello,

I use a OPC Server (with Data Access 3.0) and I try to develop a Labview OPC Client application on Windows Vista.

I also use a C++ DLL where all the OPC client activities are done!

Everything works fine if I use this OPC-Client DLL from a Windows C++ Console Application , so I think all the DCOM settings and other settings are fine.

But if I try to connect and read an OPC item of the remote OPC Server with Labview and the "Call Function Library Node" then it's not possible to connect the DA-Session with the DA item!

Can anyone help me? Is there a Windows setting for Labview.exe necessary?

Local OPC Server work fine (also with Labview).

Thanks

Hans 

[daHans · Accepted solution]

I've solved the problem(s)!!!!!!

Problems:

- Labview -> Data Socket -> local OPC Server : OK, Remote OPC: Error

- .NET or ActiveX OPC Client Toolbox mit Labview: local OPC Server : OK, Remote OPC: Error

Solution:

Add line "ole.AuthnLevel = 1" to the LabVIEW.ini file.  ( C:\Programme\National Instruments\LabVIEW 8.6\LabVIEW.ini)

Now it works!

Hans

[sletrab]

Hello,

Don't forget to add this line also to the ini-File of your Application!

https://www.ni.com/docs/en-US/bundle/teststand/page/dcom-settings-for-the-local-computer-setting.htm...