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<p class="MsoNormal">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.<o:p></o:p></p>
<p class="MsoNormal"><o:p> </o:p></p>
<p class="MsoNormal">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.<o:p></o:p></p>
<p class="MsoNormal"><o:p> </o:p></p>
<p class="MsoNormal">C++ function<o:p></o:p></p>
<p class="MsoNormal">----------------------------------------<o:p></o:p></p>
<p class="MsoNormal">RcppExport SEXP TestWide(SEXP _strIn)<o:p></o:p></p>
<p class="MsoNormal">{<o:p></o:p></p>
<p class="MsoNormal"> std::wstring strIn = Rcpp::as<std::wstring>(_strIn);<o:p></o:p></p>
<p class="MsoNormal"> for (const wchar_t *p = strIn.c_str(); *p; ++p)<o:p></o:p></p>
<p class="MsoNormal"> Rprintf("%x\n", *p);<o:p></o:p></p>
<p class="MsoNormal"> std::wstring str = L"a\x02a5c";<o:p></o:p></p>
<p class="MsoNormal"> return Rcpp::wrap(str);<o:p></o:p></p>
<p class="MsoNormal">}<o:p></o:p></p>
<p class="MsoNormal"><o:p> </o:p></p>
<p class="MsoNormal">R Script<o:p></o:p></p>
<p class="MsoNormal">----------------------------------------<o:p></o:p></p>
<p class="MsoNormal">test <- "a\u02a5b"<o:p></o:p></p>
<p class="MsoNormal">a<-.Call( "TestWide", test, PACKAGE = "AlteryxRDataX" )<o:p></o:p></p>
<p class="MsoNormal">print(Encoding(a))<o:p></o:p></p>
<p class="MsoNormal">print(a)<o:p></o:p></p>
<p class="MsoNormal"><o:p> </o:p></p>
<p class="MsoNormal">R Output<o:p></o:p></p>
<p class="MsoNormal">----------------------------------------<o:p></o:p></p>
<p class="MsoNormal" style="text-autospace:none"><span style="font-size:10.0pt;font-family:"Verdana","sans-serif";color:black">R version 3.0.0 (2013-04-03) - x86_64
<o:p></o:p></span></p>
<p class="MsoNormal" style="text-autospace:none"><span style="font-size:10.0pt;font-family:"Verdana","sans-serif";color:black">rgeos version: 0.2-16, (SVN revision 389)<o:p></o:p></span></p>
<p class="MsoNormal" style="text-autospace:none"><span style="font-size:10.0pt;font-family:"Verdana","sans-serif";color:black">GEOS runtime version: 3.3.6-CAPI-1.7.6
<o:p></o:p></span></p>
<p class="MsoNormal" style="text-autospace:none"><span style="font-size:10.0pt;font-family:"Verdana","sans-serif";color:black">Polygon checking: TRUE
<o:p></o:p></span></p>
<p class="MsoNormal" style="text-autospace:none"><span style="font-size:10.0pt;font-family:"Verdana","sans-serif";color:black">61<o:p></o:p></span></p>
<p class="MsoNormal" style="text-autospace:none"><span style="font-size:10.0pt;font-family:"Verdana","sans-serif";color:black">ffca<o:p></o:p></span></p>
<p class="MsoNormal" style="text-autospace:none"><span style="font-size:10.0pt;font-family:"Verdana","sans-serif";color:black">ffa5<o:p></o:p></span></p>
<p class="MsoNormal" style="text-autospace:none"><span style="font-size:10.0pt;font-family:"Verdana","sans-serif";color:black">62<o:p></o:p></span></p>
<p class="MsoNormal" style="text-autospace:none"><span style="font-size:10.0pt;font-family:"Verdana","sans-serif";color:black">"unknown"<o:p></o:p></span></p>
<p class="MsoNormal" style="text-autospace:none"><span style="font-size:10.0pt;font-family:"Verdana","sans-serif";color:black">"a?"<o:p></o:p></span></p>
<p class="MsoNormal"><o:p> </o:p></p>
<p class="MsoNormal">Thanks,<o:p></o:p></p>
<p class="MsoNormal"><o:p> </o:p></p>
<p class="MsoNormal"><b><span style="font-size:9.0pt;font-family:"Verdana","sans-serif";color:#1F497D">Ned Harding</span></b><span style="font-size:9.0pt;font-family:"Verdana","sans-serif";color:#1F497D"><o:p></o:p></span></p>
<p class="MsoNormal"><span style="color:navy">Alteryx</span><span style="color:navy"><o:p></o:p></span></p>
<p class="MsoNormal"><span style="color:navy">CTO<o:p></o:p></span></p>
<p class="MsoNormal"><span style="color:navy">3825 Iris Avenue, Suite 150<o:p></o:p></span></p>
<p class="MsoNormal"><span style="color:navy">Boulder, CO 80301<o:p></o:p></span></p>
<p class="MsoNormal"><span style="color:navy">Phone: 720-259-0541<o:p></o:p></span></p>
<p class="MsoNormal"><span style="color:navy">eMail: <a href="mailto:ned@alteryx.com">
<span style="color:blue">ned@alteryx.com</span></a><o:p></o:p></span></p>
<p class="MsoNormal"><o:p> </o:p></p>
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