Hello,
First of all, any VI that is created to run on an FPGA will need to be compiled down to a bitfile in order to download to the FPGA - creating a dll out of the bitfile is not something that can be done with LabVIEW, or any other environment that I'm aware of. The reason for this is that the bitfile specifies the hardware configuration of the FPGA rather than a set of functions that can be exported.
If instead you're referring to the host VI that will actually communicate with the FPGA, then we can create DLL's to be called in other development environments in this case. This will require having the Application Builder module installed with LabVIEW to create the DLL. Depending of course on your application and personal preferences, you may find it more convenient to complete the development in LabVIEW rather than exporting it out to C++.
Cheers,
Matt Pollock
National Instruments
