How to implement a callback function using LabView's Call Library Function Node?

[HallmannSVS]

Dear rolf,

thank you for your Reply. It is a complex issue.Correct links are very helpful

[aa@ray]

Hi Hallman,

I did solve the problem. I will post my solution soon but it involves creating a new .dll in C++ for my LabView software that dereferences all the pointers. This new .dll gets all the functions from the Canon .dll. I also found a solution that handles all the callback functions. Again it requires a bit of C++ code.

Alejandro

[HallmannSVS]

Hello Alejandro

 thank you for you replay. I think you solution (an example) will help. I know you need also C++. It's ok.

So i will wait of your posting.

Best regard

Alexander Hallmann

[Philippe_RSA]

Found an easier way.

Used this for .net and c callback functions.

Instead of using variants and passing user parameters, I just use a user event counter, and process all the data in the callback vi.

The data is then shared in a global variable to be read when there is a user event on the event counter.

Completely contrived, but works like a bomb, no matter how complex the callback.