(PR#4806)

L.T.Kell@cefas.co.uk

Mon, Oct 27, 2003 1:00 PM

Duncan Temple Lang correctly pointed out that the function should have been
declared as

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

However, the problem is that calling any of the functions in my DLL
(compiled using MSVC C++) causes R 1.8.0 to crash; out() ws just a simple
example. The functions had previous worked under R 1.7.x. I have now
recompiled R 1.8.0 under an earlier version of MinGW and my DLL functions
now works. I therefore suspect that the problem is related to MinGW and
Windows.

Regards Laurie

 -----Original Message-----
From: 	Laurence Kell FM CEFAS  
Sent:	27 October 2003 15:34
To:	'r-bugs@r-project.org'
Subject:	

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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@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


 << File: Laurence Kell (E-mail).vcf >>

(PR#4806)

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