Fatal internal error MemoryManager.cpp, line 406

[jtdavies]

I have a CVI program that calls into a dll created from a VI.

When the VI is compiled with debugging off, the program runs, but doesn't return the reults I expect. So I turned on debugging and tried to step into the dll.

That results in the line 406 error.

I've searched my drive for MemoryManager.cpp, but I guess it isn't provided (or I didn't install it)

What should be my next step in tracking this down?

[jtdavies]

Found it!

I was assuming (wrongly) that the error out structure would be allocated in the dll. No, it has to be created before passing it into the dll.

[jtdavies]

More info on how I found the problem.

My dll had lots of parameters passed in - gains, errors in, errors out, etc. To debug, I tried to pass in NULL for most of the parameters and the function ran without an error (good NULL checking on NI's part). So I just replaced with real parameters one at a time until I found the problem.