Read Multiple Tags/Items at once using OPCDAAUTO.DLL Group Object Method - SyncRead|Classic OPC: DA, A&E, HDA, XML-DA, etc.|Forum|OPC Foundation

Gents,

I’m using NI LabVIEW environment for my software development along with OPCDAAUTO.DLL and I faced up with the issue specifying ServerHandles input for SyncRead method of Group Object. I was able to find similar data type of ServerHandles out of Items Object Method – AddItems and link the output with input together, but AddItems need its own input of ClientHandles of the same data type as ServerHandles.

I was able to read single ClientHandle as Int32/LONG from other function but I can’t just link Int32/LONG to *SAFEARRAY(LONG).

ServerHandles and ClientHandles are specified as SAFEARRAY(LONG) data type, which I found that it’s a special C++ data type and not supported by LabVIEW.

What would you recommend to convert ClientHandle as of type Int32/LONG to ClientHandles as of type SAFEARRAY(LONG) ?

I wish it would be another Group Object Method with standard INPUT data types, which will OUTPUT ClientHandles, so I can use it elsewhere.

Thanks,
VK