I have created an OPC Client using Visual Basic 6 which retrieves data from Honeywell OPC Server.
Similarly I want to create a DLL file for the same code operation. Can anyone tell me what is the procedure to start with the help of ActiveX DLL page?
I do not know where to start from.

Actually the third party vendor will access my DLL which will give data of LCN and write back again.

Any help for this. Will be grateful.

 

I have done that. Firstly, you create a new activex dll/exe project. Then add some class modules. Customising the modules, this is the tricky task, you must know the spec of the 3rd party software needs.