Complex arrays for DLLs

I have spent a lot of time trying to pass arrays of complex numbers between LabVIEW and a DLL I have written in C++, but with no success. The data types I wish to interface with in the C++ are things like std::vector<std::complex<float> > and std::vector<std::complex<int16_t> > (or just the basic arrays they contain). However, I would be willing to use any sensible data representation (i.e. such that I don't need to shift it around in memory unnecessarily).
I have gone through all the DLL examples in LabVIEW 2013, which include complex numbers and arrays, but not arrays of complex numbers. I tried using the typedef struct approach for handling complex numbers (suggested in one example). This works fine within my C++ code: I can reinterpret_cast<...>(...) to get back to arrays of std::complex. However, every attempt at interfacing this with LabVIEW has failed in a variety of ways. At best, I managed to get some garbled numbers passing back and forth.
So, does anyone know where I can find a (very) basic example/step-by-step guide to passing complex arrays between LabVIEW and DLLs? Given that this is trivial in C++, I imagine there must be a straightforward solution out there somewhere.
Many thanks!

A LabVIEW complex number is simply a structure with the imaginary and real value both represented as a floating point number. As such there is very little you can do on the LabVIEW side to change that. C++ object pointers are compiler specific and often even dependent on the version of the template library that was used to compile them. As such there is absolutely NO way to use them in any code that needs to be called from code that was not compiled with the same C++ compiler and the same compile settings. You can bend in circles and jump through hoops but there is simply no way to get around that.
The only C++ object oriented framework that I know and avoids this limitation for the most part is the COM/DCOM standard which imposes certain limits on object interfaces so that you can get around the compiler specific ABI conventions, but only if you are very careful about how you invoke the compiler. With a bit of macro magic that can be enabled in the IDL precompiler you can even call COM/DCOM objects from standard C. Also COM/DCOM definitely will not work wth C++ template libraries and the like.
Rolf Kalbermatter
CIT Engineering Netherlands
a division of Test & Measurement Solutions

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Solved!
Go to Solution.

I used the Spreadsheet String to Array, Decimate Array, and then Re/Im to Complex.
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Unofficial Forum Rules and Guidelines
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