[Rcpp-devel] rout and rerr instead of cout and cerr in Rcpp
Just to follow up myself, it turns out that it?s easy to redirect cerr and
cout to files, and that solves all my issues.
In case anyone is interested, here is how I did it:
#include<ostream>
#include<fstream>
RcppExport SEXP myfunction(SEXP params)
{
try
{ // or use BEGIN_RCPP macro
//start off by redirecting
streambuf* save_sbuf_fout;
streambuf* save_sbuf_ferr;
streambuf* save_sbuf_cout;
streambuf* save_sbuf_cerr;
ofstream fout;
ofstream ferr;
fout.open("cout.txt");
ferr.open("cerr.txt");
save_sbuf_cout = cout.rdbuf();
save_sbuf_cerr = cerr.rdbuf();
save_sbuf_fout = fout.rdbuf();
save_sbuf_ferr = ferr.rdbuf();
cout.rdbuf(save_sbuf_fout);
cerr.rdbuf(save_sbuf_ferr);
/*do whatever I normally do and write to cerr and/or cout all I
want*/
//revert to original state
cout.rdbuf(save_sbuf_cout);
cerr.rdbuf(save_sbuf_cerr);
fout.close();
ferr.close();
}
}
On 4/27/11 9:26 PM, "Sean Robert McGuffee" <sean.mcguffee at gmail.com> wrote:
>On 11/10/2009 12:23 PM, Dirk Eddelbuettel wrote:
On 10 November 2009 at 09:47, Romain Fran?ois wrote: | Hi, | | Would it make sense to have an rout and rerr so that we could do : | | rout<< "bla bla"<< endl ; | | and | | rerr<< "bla bla"<< endl ; | | and this would go into Rprintf and REprintf ? or maybe we can directly | redefine cout and cerr Hm. That never really arose in my use. cout was mostly for debugging. I think a C++-ish way is to create<< operators (that eg RcppDate and RcppDatetime have). Where you thinking of something other than debugging help?
|Not really, but just sort of making sure debugging is consistent with |the recommendation from WRE of using Rprintf instead of printf
Has anyone followed up on this? I?m wondering if there might be a simple way to redirect cerr and cout to something like an rerr and rout? I for one have thousands of lines of code that use cerr and cout in libraries that I would like to use in R. It seems that they currently are causing a crash at run-time when I leave those lines in my packages. I won?t know for sure until I take the time to remove all of them, but who knows how long that might take. I think it would probably be faster and easier for me to redirect these streams to R somehow. Has that been worked out yet? If so, how? If not, I think maybe I can redirect them to some log files or something. Has anyone done that? Thanks, Sean
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