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POUsing Rcpp with Windows-specific includes
 

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  1. POUsing Rcpp with Windows-specific includes
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    <p>I'm trying to write some C++ code that accesses some OS-level things in Windows, using Rcpp. As soon as I include <code>windows.h</code> or <code>shlobj.h</code>, I get a bunch of compilation errors. When I run this code, it works, so I know I'm getting some of the basics right. But when I uncomment either of the Windows-related <code>#include</code> lines, it doesn't work.</p> <pre><code>library(inline) inc &lt;- ' #include &lt;iostream&gt; #include &lt;stdio.h&gt; // #include &lt;windows.h&gt; // #include &lt;shlobj.h&gt; using namespace std; ' src &lt;- ' cout &lt;&lt; "foo\\n"; printf("foo2\\n"); return Rcpp::wrap(20); ' fun &lt;- cxxfunction(signature(), includes = inc, src, plugin="Rcpp") fun() </code></pre> <p>Note: When I run this in RStudio, the output from <code>cout</code> and <code>printf</code> appear in the console, but when I run it from the Windows RGui, the output doesn't appear. I assume this has something to do with the way RGui handles text output.</p> <p>When I uncomment those include lines, the errors I get look like this:</p> <pre><code>In file included from c:\rtools\gcc-4.6.3\bin\../lib/gcc/i686-w64-mingw32/4.6.3/../../../../i686-w64-mingw32/include/objbase.h:154:0, from c:\rtools\gcc-4.6.3\bin\../lib/gcc/i686-w64-mingw32/4.6.3/../../../../i686-w64-mingw32/include/ole2.h:16, from c:\rtools\gcc-4.6.3\bin\../lib/gcc/i686-w64-mingw32/4.6.3/../../../../i686-w64-mingw32/include/windows.h:94, from file43c2f9e3518.cpp:22: c:\rtools\gcc-4.6.3\bin\../lib/gcc/i686-w64-mingw32/4.6.3/../../../../i686-w64-mingw32/include/objidl.h:598:52: error: macro "Realloc" requires 3 arguments, but only 2 given c:\rtools\gcc-4.6.3\bin\../lib/gcc/i686-w64-mingw32/4.6.3/../../../../i686-w64-mingw32/include/objidl.h:598:56: error: ISO C++ forbids initialization of member 'Realloc' [-fpermissive] c:\rtools\gcc-4.6.3\bin\../lib/gcc/i686-w64-mingw32/4.6.3/../../../../i686-w64-mingw32/include/objidl.h:598:56: error: making 'Realloc' static [-fpermissive] </code></pre> <p>... and so on</p> <p>Any hints on how to make this work?</p> <hr> <p><strong>Update</strong>: I managed to get some of the errors to go away, but some remain.</p> <p>I also got of the <code>Realloc</code> errors by following some advice from <a href="http://tolstoy.newcastle.edu.au/R/e2/devel/06/11/1242.html" rel="nofollow noreferrer">http://tolstoy.newcastle.edu.au/R/e2/devel/06/11/1242.html</a></p> <p>The <code>inc</code> should be replaced with:</p> <pre><code>inc &lt;- ' #include &lt;iostream&gt; #include &lt;stdio.h&gt; // This is taken from http://tolstoy.newcastle.edu.au/R/e2/devel/06/11/1242.html #include &lt;R.h&gt; #undef Realloc #define R_Realloc(p,n,t) (t *) R_chk_realloc( (void *)(p), (size_t)((n) * sizeof(t)) ) #include &lt;shlobj.h&gt; using namespace std; ' </code></pre> <p>I also got rid of other errors by passing <code>-fpermissive</code> to the compiler, as from this question: <a href="https://stackoverflow.com/questions/7063265/how-to-set-g-compiler-flags-using-rcpp-and-inline">How to set g++ compiler flags using Rcpp and inline?</a></p> <pre><code>settings &lt;- getPlugin("Rcpp") settings$env$PKG_CXXFLAGS &lt;- paste('-fpermissive',settings$env$PKG_CXXFLAGS,sep=' ') fun &lt;- cxxfunction(signature(), includes = inc, src, plugin = "Rcpp", settings = settings) Sys.unsetenv('PKG_CXXFLAGS') </code></pre> <p>But there are still some errors:</p> <pre><code>In file included from c:\rtools\gcc-4.6.3\bin\../lib/gcc/i686-w64-mingw32/4.6.3/../../../../i686-w64-mingw32/include/objbase.h:154:0, from c:\rtools\gcc-4.6.3\bin\../lib/gcc/i686-w64-mingw32/4.6.3/../../../../i686-w64-mingw32/include/ole2.h:16, from c:\rtools\gcc-4.6.3\bin\../lib/gcc/i686-w64-mingw32/4.6.3/../../../../i686-w64-mingw32/include/shlobj.h:86, from file43c267d3279.cpp:26: c:\rtools\gcc-4.6.3\bin\../lib/gcc/i686-w64-mingw32/4.6.3/../../../../i686-w64-mingw32/include/objidl.h:599:25: error: expected identifier before '(' token c:\rtools\gcc-4.6.3\bin\../lib/gcc/i686-w64-mingw32/4.6.3/../../../../i686-w64-mingw32/include/objidl.h:599:25: error: 'parameter' declared as function returning a function c:\rtools\gcc-4.6.3\bin\../lib/gcc/i686-w64-mingw32/4.6.3/../../../../i686-w64-mingw32/include/objidl.h:599:25: error: expected ')' before ',' token </code></pre>
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