On Tue, 12 Sep 2006, Tom McCallum wrote:
> Hi everyone,
>
> I have been attempting to build a very simple R package interfacing with
> some very simple C++ code. Everything I try though results in the
> function working but on return it produces a memory error. Here is the
> output:
>
> ***********OUTPUT***************************
>
> > library(MyPackage)
> > hello();
>
> *** caught segfault ***
> address 0x3, cause 'memory not mapped'
>
> **********END OUTPUT*************************
>
> I have read that some time this occurs because it cannot find the function
> in the shared library but I have tested this theory with a simple text
Where did you read that? It is not true: you get an R error message in
that case.
> message and this is displayed but again the memory error occurs.
>
> The C++ code has been reduced to the simplest possible:
>
> *** helloworld.h
>
> extern "C" void helloworld(void);
>
> *** helloworld.cpp
>
> #include <iostream>
> #include "helloworld.h"
>
> void helloworld(void) {
> // This was my test line that was displayed as described above.
> // std::cout << "My first R Package Test." << std::endl;
> }
>
But that is the problem: .Call requires a SEXP return value from the entry
point it calls.
> I also wrote an R wrapper called hello as follows:
>
> *** helloworld.R
>
> hello <- function()
> {
> .Call("helloworld", PACKAGE="MyPackage");
> }
>
> The namespaces file (NAMESPACE) is as follows:
>
> useDynLib(MyPackage)
> export(hello)
>
> I have compared mine against other package sources available that do the
> same thing and cannot find the key difference.
>
> Thank you for your help in advance,
>
> Tom
>
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> https://stat.ethz.ch/mailman/listinfo/r-devel
>
--
Brian D. Ripley, [EMAIL PROTECTED]
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
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