[R] Calling function in DLL using .C

[Duncan Murdoch]

On 24/01/2012 11:55 AM, Alex van der Spek wrote:
> Uploaded the DLL here:
>
> http://www.filefactory.com/file/c2c56ad/n/Planck.dll

I get:


  403 Forbidden

Request forbidden by administrative rules.

Duncan Murdoch

> Appreciate if you can check to see if anything is wrong with this DLL. I
> use dumpbin to look at what is in the exports table of the DLL. No reason
> for concerns there. I can work with this DLL from both VBA and Python.
> Python's ctypes allow the use of both the C and stdcall versions. Both
> work fine.
>
>
> By the way, the DLL contains, for every function, one export using C
> calling conventions for use in R (name appended with R) and one export
> using stdcall for use with VBA/Python, the latter using decorated names.
>
> Reading up on gcc in the mean time.
>
> Thank you,
> Alex van der Spek
>
> >  On 24/01/2012 10:35 AM, Alex van der Spek wrote:
> >>  Yes, sorry, I am learning how to do this. I am a simple and ageing
> >>  physicist who grew up with Fortran and Algol.
> >>
> >>  Just wondering if what appears to be an internal R inconsistency between
> >>  is.loaded() and .C() can be explained.
> >>
> >>  Attempts to compile with gcc to a DLL unsuccessfull so far. That is
> >>  solely because I have never used gcc before and have a long way to go.
> >>  Years ago I taught myself how to use DLLs in VBA, it took 6 weeks to
> >>  learn how to make sense out of decorated names and Fortran string
> >>  passing. The use of DLLs in Python was easy. I am OK with investing
> >>  weeks again to learn how to do this in R but with the apparent
> >>  inconsistency I am uncertain where to begin. Drop VC97 and use gcc as a
> >>  cure all?
> >
> >  That would be easiest, because then there would be lots of others
> >  available to help you.  You may be the only one using your particular
> >  compiler with R.
> >
> >  You could also post the .dll online so others can take a look and see
> >  what's going on.  We might not be able to tell you how to fix the
> >  problem with your compiler, but we could likely tell you what it is.
> >
> >  Duncan Murdoch
> >
> >>  Thanks,
> >>  Alex van der Spek
> >>
> >>
> >>
> >>  On 01/24/2012 04:11 PM, Duncan Murdoch wrote:
> >>  >   On 24/01/2012 6:49 AM, Alex van der Spek wrote:
> >>  >>   I cannot understand why a function appears to be available to R
> >>  >>   (is.loaded('planckwR') returns TRUE) but the call with .C results in
> >>  an
> >>  >>   error message:
> >>  >>
> >>  >>   C symbol name 'planckwR' not in DLL for package<path to DLL file
> >>  here>
> >>  >
> >>  >   You posted this question a few days ago, and said you'd try using gcc
> >>  >   instead of VS.  How did that go?
> >>  >
> >>  >   Duncan Murdoch
> >>  >
> >>
> >
> >
>
>