[Rd] (PR#4806)

[Duncan Temple Lang]

As far as I can see, the code you give passes two integer vectors (x
and y) to a routine out() that accesses the values in the vector as if
they were numeric vectors.  This is an error in the code and not in R.

If test were written as 

  test  = function(x, y) .Call("out", as.numeric(x), as.numeric(y))

the code will work or other problems will be found.


 D.


L.T.Kell at cefas.co.uk wrote:
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> 
> I am trying to call functions written in Visual C++ from R version 1.8.0
> under Windows. 
> Although these functions ran correctly in version 1.7 in Version 1.8.0 they
> cause R to crash after the function has returned to R
> 
> I can repeat the problem with a DLL based on a simple example given by
> Douglas Bates. 
> 
> dyn.load("TestDll.dll")
> test<-function(x,y) .Call("out",x,y)
> 
> x<-1:10
> y<-2:10
> test(x,y)
> 
> The C++ code is below
> 
> #include <windows.h>
> #include <R.h>
> #include <Rinternals.h>
> 
> 
> HWND      hWndMain;   
> HINSTANCE hInst;    
> HGLOBAL   hXloperArray;
> 
> //32 bit Entry point
> 
> #define CLASS_NAME_BUFFER  50
> 
> BOOL WINAPI DllMain(HINSTANCE hDLL, DWORD dwReason, LPVOID lpReserved)
>    {					
>    extern HWND      hWndMain;
>    extern HINSTANCE hInst;    
>    
>    hInst = hDLL; 
>     
>    return TRUE;
>    }
> 
> extern "C" int FAR PASCAL WEP (int nArgument)
>    {
>    return 1;
>    } 
>      
> extern "C" __declspec(dllexport) SEXP __stdcall out(SEXP x, SEXP y)
>      {
>        int i, j, nx, ny;
>        double tmp;
>        SEXP ans;
>      
>        nx = length(x); ny = length(y);
>        PROTECT(ans = allocMatrix(REALSXP, nx, ny));
>        for(i = 0; i < nx; i++) {
>          tmp = REAL(x)[i];
>          for(j = 0; j < ny; j++)
>            REAL(ans)[i + nx*j] = tmp * REAL(y)[j];
>        }
>        UNPROTECT(1);
>        return(ans);
>      }
>      
> 
> 
> I created the lib file from the R.dll using pexports and lib
> i.e.
> 
> pexports R.dll > RDLL.def
> lib /machine:i386 /def:RDLL.def /out:Rdll.lib
> 
> Used the following def file
> 
> LIBRARY   TestDLL	
> EXPORTS	
>    out		       =_out at 8
> 
> Regards Laurie
> 
> --please do not edit the information below--
> 
> Version:
>  platform = i386-pc-mingw32
>  arch = i386
>  os = mingw32
>  system = i386, mingw32
>  status = 
>  major = 1
>  minor = 8.0
>  year = 2003
>  month = 10
>  day = 08
>  language = R
> 
> Windows 2000 Professional (build 2195) Service Pack 3.0
> 
> Search Path:
>  .GlobalEnv, package:methods, package:ctest, package:mva, package:modreg,
> package:nls, package:ts, Autoloads, package:base
> 
> 
>  <<Laurence Kell (E-mail).vcf>> 
> 
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> FN:Laurence Kell (E-mail)
> ORG:CEFAS
> TEL;WORK;VOICE:+44 (0) 1502 524257
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> ADR;WORK:;;Lowestoft Laboratory;Pakefield Road;Lowestoft,;NR33 0HT;UK
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-- 
_______________________________________________________________

Duncan Temple Lang                duncan at research.bell-labs.com
Bell Labs, Lucent Technologies    office: (908)582-3217
700 Mountain Avenue, Room 2C-259  fax:    (908)582-3340
Murray Hill, NJ  07974-2070       
         http://cm.bell-labs.com/stat/duncan