dyn.load problem

Hi R-Users

    I wrote 1 week ago asking about a message that appears when I try run
dyn.load.
   I'm trying to do an example in C code from "Writing R Extension"  to
learn how to do it.
    I have  R 2.0.0, Rtools, Perl and MinGW as describe  in
http://www.murdoch-sutherland.com/Rtools/ with path sets.

 When I use C:\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.dll")  results:

Error in dyn.load(x, as.logical(local), as.logical(now)) :
        unable to load shared library "C:/Dev-Cpp/teste":
  LoadLibrary failure:  Par??metro incorreto. (Incorrect Parameter)

My C code is (extracted form Writing 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);
     }

    I??m using RCMD under Windows ME.

   How can I fix this? Someone can help me ? Prof. Ripley told me to catch
more information debbuging this DLL. Is it hard to do this one under
Windows? It??s necessary modify  files SHLIB or MkDLL?

Thanks

O. Neto

Hi, Uwe.

    Thank you for help.

    Yesterday another R-user Mr. Ramasamy told me to do a simple program
such as (changing too the directories, now C:/minhadll/):

/*file conv.c*/

#include <R.h>
void printhello (){
  Rprintf("%s", "hello world\n");
}

    When I use C:\R\rw2000\bin>RCMD SHLIB -o c:/minhadll/meuteste.dll
c:/minhadll/conv.c
 to compile this one. Below is the output.

C:\R\rw2000\bin> RCMD SHLIB -o c:/minhadll/meuteste.dll c:/minhadll/conv.c
making c:/minhadll/conv.d from c:/minhadll/conv.c
gcc   -IC:/R/RW2000/include -Wall -O2   -c c:/minhadll/conv.c -o
c:/minhadll/conv.o
ar cr c:/minhadll/meuteste.a c:/minhadll/conv.o
ranlib c:/minhadll/meuteste.a
gcc  --shared -s  -o c:/minhadll/meuteste.dll c:/minhadll/meuteste.def
c:/minhadll/meuteste.a  -LC:/R/RW2000/src/gnuwin32  -lg2c -lR

    The result is " meuteste.dll"  located in C:/minhadll/meuteste.dll. Now,
talking about paths:
    I believe that I have make a correct way... but I'll list here to you:

SET PATH=C:\Rtools\;C:\Perl\bin\;C:\MinGW\bin;C:\R\rw2000\include\

        Is it correct?
Thank you again for help me. I'm trying to do a dll for 3 weeks or more,
without a good result.

PS: The same error dyn.load appears


O. Neto