I've designed a FPGA VI, with its coresponding Host VI that is working well. I needed to interact with the VI from a C language application. So, I used LabView's Application Builder to build a shared library (DLL). From my C code I use the LoadLibrary and GetProcAddress to make calls to my Host VI within the DLL. Functionally, everything works, i.e. I can control the VIs via my C application.
However, for the application in which this is being used, the Host VI method within the DLL that the C code calls takes too long to process. Through debuging, I found that the Host VI method takes about 0.85 seconds to return. I actually went in and created a Host VI method that does nothing, just to prove that it wasn't the Host VI doing some work that was hogging the time.
This just seems like way too long to return from a call to a routine that does nothing. Is this a windows problem, or something under the hood that's happening in my Labview created DLL? Like I said, functionally it works, and interfacing to it is simple.
If you need more details, just ask.
Thanks for your help.
- Rick
