Re: [R] Pass String from R to C

From: Duncan Murdoch <murdoch.duncan_at_gmail.com>
Date: Mon, 25 Apr 2011 13:12:30 -0400

On 25/04/2011 1:03 PM, Duncan Murdoch wrote:
> On 25/04/2011 12:51 PM, Jaimin Dave wrote:
> > I tried using char ** but it is printing some random string.
>
> str is a pointer to an array of pointers to strings. That's what char**
> means. So you need to declare it that way, and use it that way.
>
> This works for me:
>
> File test.c:
>
> void test(char **str)
> {
> Rprintf("%s",*str);
> }

Oops, I just noticed that the include was missing. The full file should have

#include "R.h"

at the beginning.

Duncan Murdoch

> Duncan Murdoch
> > On Sat, Apr 23, 2011 at 6:08 PM, Duncan Murdoch<murdoch.duncan@gmail.com>wrote:
> >
> > > On 11-04-23 7:04 PM, Jaimin Dave wrote:
> > >
> > >> Hi,
> > >> I am using a function which accepts the string from R and prints it.
> > >> But when I am calling .C("main","hello");
> > >> it is printing any random thing.
> > >> My C function is
> > >> void main(char *str)
> > >>
> > >
> > > See Writing R Extensions. The declaration should be char **str.
> > >
> > > Duncan Murdoch
> > >
> > > {
> > >> Rprintf("%s",str);
> > >> }
> > >>
> > >> Can you help how to achieve this using .C interface?
> > >>
> > >> Thanks
> > >> Jaimin
> > >>
> > >> [[alternative HTML version deleted]]
> > >>
> > >> ______________________________________________
> > >> R-help_at_r-project.org mailing list
> > >> https://stat.ethz.ch/mailman/listinfo/r-help
> > >> PLEASE do read the posting guide
> > >> http://www.R-project.org/posting-guide.html<http://www.r-project.org/posting-guide.html>
> > >> and provide commented, minimal, self-contained, reproducible code.
> > >>
> > >
> > >
> >
> > [[alternative HTML version deleted]]
> >
> > ______________________________________________
> > R-help_at_r-project.org mailing list
> > https://stat.ethz.ch/mailman/listinfo/r-help
> > PLEASE do read the posting guide http://www.R-project.org/posting-guide.html
> > and provide commented, minimal, self-contained, reproducible code.
>



R-help_at_r-project.org mailing list
https://stat.ethz.ch/mailman/listinfo/r-help PLEASE do read the posting guide http://www.R-project.org/posting-guide.html and provide commented, minimal, self-contained, reproducible code. Received on Mon 25 Apr 2011 - 17:14:47 GMT

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