how to import dll file of openhaptics into labview?

[park92]

i spend few time to try to write dll file of openhaptics.

i access successfully about dll file and import functions exclude two functions which are related with synchronous (below figure).

i don't know how to apply those two functions in LABVIEW..

maybe i think the red color makes problem.

please help me..

i stuck hear few days 😫

[rolfk]

The simple answer is that you can’t! The Call Library Node can not work with function pointers.

There are ways to do it without creating a wrapper DLL in C but they are many times more complex, difficult, error prone, brittle and totally unsafe to use for anyone but the original author in comparison to writing a wrapper DLL in plain C.

If the prospects of having to write such a DLL gives you the jibes, you can’t possibly imagine the troubles you would have to overcome trying to get around that with the Call Library Node. I definitely don’t see it as a viable option for snyone but real low level C programmer experts and those will generally refuse to do it in such a way as it is cumbersome and totally unmaintainable in the long run.

Learn enough C programming to be able to write this wrapper DLL (function pointers are the more advanced chapters of C programming) or hire someone to do this DLL for you are the only valid options IMHO aside from finding an alternative API or avoiding the functions requiring callback functions.

[park92]

thank you for replying on my question. I already solve it through making c wrapper code. Thank you so much.

[rolfk]

That’s great to know. Let’s see how long it takes before someone answers to this thread asking if you could please send your DLL to them! 😀