[R] Problem with dyn.load()

[Prof Brian Ripley]

Please do read the help file before posting. as the posting guide asks.
?dyn.load says

       x: a character string giving the pathname to a shared library or
          DLL.

Your DLL is "teste.dll", not "teste": you probably do have a file "teste" 
that is not a DLL or you would get a more informative error message.

That's not a mistake I have ever seen reported on R-help.

On Sun, 7 Nov 2004, O. Neto wrote:

> Hi!
> 
> I am studying C language to run with R 2.0.0. My system (Windows ME /BR) is configured to run RCMD ( I have installed ActivePerl, Rtools and MinGW as indicated in http://www.murdoch-sutherland.com/Rtools/ an with correct path).
> I would like run the coded write below named conv.c (Example from "Write R Extension") :
> 
>     #include <R.h>
>      #include <Rinternals.h>
>      SEXP convolve2(SEXP a, SEXP b)
>      {
>        R_len_t i, j, na, nb, nab;
>        double *xa, *xb, *xab;
>        SEXP ab;
>      
>        PROTECT(a = coerceVector(a, REALSXP));
>        PROTECT(b = coerceVector(b, REALSXP));
>        na = length(a); nb = length(b); nab = na + nb - 1;
>        PROTECT(ab = allocVector(REALSXP, nab));
>        xa = REAL(a); xb = REAL(b);
>        xab = REAL(ab);
>        for(i = 0; i < nab; i++) xab[i] = 0.0;
>        for(i = 0; i < na; i++)
>          for(j = 0; j < nb; j++) xab[i + j] += xa[i] * xb[j];
>        UNPROTECT(3);
>        return(ab);
>      }
> 
>     When I use C:\Arquiv~1\R\rw2000\bin>RCMD SHLIB -o
> C:/dev-cpp/teste.dll c:/dev-cpp/conv.c a teste.dll is created without
> error and located in that directory, but when I use it in RGui with
> "Change dir" set to C:/dev-cpp :
> 
> >dyn.load("teste")  results:
> Error in dyn.load(x, as.logical(local), as.logical(now)) : 
>         unable to load shared library "C:/Dev-Cpp/teste":
>   LoadLibrary failure:  Parâmetro incorreto. (Incorrect Parameter)
> 
>     I tried find help in R-help, but none answers my questions.

>     My doubts are: Why does it occur? How do I fix it? How I can include
> directives in RCMD -SHLIB, for example, conv.def file to mangling names?
> It is editing Makevars.win?

> If anybody have time to answer my question, I apreciate.

> 
> Thanks,
> 
> O. Neto
> 
> PS: There is any discussion list of R in portuguese? I can't find one.
> 
> 
> 
>      
> 	[[alternative HTML version deleted]]

Please do note what the posting guide says about this!

> PLEASE do read the posting guide! http://www.R-project.org/posting-guide.html

-- 
Brian D. Ripley,                  ripley at stats.ox.ac.uk
Professor of Applied Statistics,  http://www.stats.ox.ac.uk/~ripley/
University of Oxford,             Tel:  +44 1865 272861 (self)
1 South Parks Road,                     +44 1865 272866 (PA)
Oxford OX1 3TG, UK                Fax:  +44 1865 272595