Wow, that's a huge amount of input. :-) Thanks to all.
So how to build up a single CLFN is partly clear.
With wizard import of the function from .dll with .h-files, I still strugling. The wizard in LV partly recognized some functions from the .h-file, but not all (see picture). It depends which .h-file I choose. At the end, no fuction was usable.
I allready tried to include in an .h-file the command #include "fileX",... . But with no sucess --> LV crashed.
In the docu is explicit written that you can develop your own driver. So it should work.
I suppose, it proba