[Rcpp-devel] Unicode on windows

Ned Harding ned at alteryx.com
Wed Jun 26 19:54:21 CEST 2013

I am having issues with the wide string conversion to and from Rcpp.  When taking in a string from R that is encoding UTF-8, I would expect as<wstring> to have converted the utf-8 to a wide string.  Instead, it is just widening all the characters and leaving the UTF-8 encoding.  I have no issue with UTF-8, but my issue is that Rcpp doesn't seem to be able to tell me what encoding the source is so I don't know if I should convert or not.

Similarly, I would expect that wrap<wstring> would produce a UTF-8 encoding SEXP, but instead the encoding in R comes back "Unknown" and the data can't print.  See The C++ & R sources below along with the output.

C++ function
RcppExport SEXP TestWide(SEXP _strIn)
                std::wstring strIn = Rcpp::as<std::wstring>(_strIn);
                for (const wchar_t *p = strIn.c_str(); *p; ++p)
                                Rprintf("%x\n", *p);
                std::wstring str = L"a\x02a5c";
                return Rcpp::wrap(str);

R Script
test <- "a\u02a5b"
a<-.Call( "TestWide", test, PACKAGE = "AlteryxRDataX" )

R Output
R version 3.0.0 (2013-04-03) - x86_64
rgeos version: 0.2-16, (SVN revision 389)
GEOS runtime version: 3.3.6-CAPI-1.7.6
Polygon checking: TRUE


Ned Harding
3825 Iris Avenue, Suite 150
Boulder, CO 80301
Phone:  720-259-0541
eMail:   ned at alteryx.com<mailto:ned at alteryx.com>

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