[R] Calling C routine in anther package in C code (R_RegisterCCallable)

From: Alex Chen <ychen_at_insightful.com>
Date: Fri, 01 Jun 2007 12:18:26 -0700


Hi,  

I want to make use of some C routines from other packages to write extensions in C.  

In "Writing R Extensions", it says there is an experimental interface to support this in (or from ?) R 2.4.0.  

I had a dummy library containing src/dummy.cpp and R/zzz.R:  

#include <R.h>

#include <Rinternals.h>

#include <R_ext/Rdynload.h>
 

extern "C"

{

  void dummy(int *a, int *b)

  {

    printf("dummy\n");

  }

}  

void R_init_dummy(DllInfo *dll)

{

  R_RegisterCCallable("dummy", "dummy", (DL_FUNC)dummy);

}  

.First.lib <- function(lib, pkg) {

  library.dynam("dummy", pkg, lib)

}  


 

I can compile this using R 2.5.0 under Linux.  

But I got the following error when I tried to load the library  

>library(dummy):

Error in dyn.load(x, as.logical(local), as.logical(now)) :

        unable to load shared library
'/homes/ychen/Rlibs/dummy/libs/dummy.so':

  /homes/ychen/Rlibs/dummy/libs/dummy.so: undefined symbol: _Z19R_RegisterCCallablePcS_PFPvvE

Error in library(dummy) : .First.lib failed for 'dummy'  

Can anyone help me out?  

Thanks!  

Alex

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