Re: [R] Pass String from R to C

From: Duncan Murdoch <murdoch.duncan_at_gmail.com>
Date: Mon, 25 Apr 2011 13:03:57 -0400

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);
}

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.



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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 - 17:06:14 GMT

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