labview and C++ dll

[tigerB]

Hi,

I have a vi with Call Library Function node call a visual C++ dll. And use this vi in my labview project. Somehow it seems to work for first time only. the next time it get to this Vi, the system seems to hang up. Any ideas?

[smercurio_fc]

Not without some indication of what your code is doing or what the DLL does. There could be many reasons, like handles that weren't closed.