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Pass String from R to C
5 messages · Jaimin Dave, Duncan Murdoch
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
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1 day later
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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 at 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.
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 at 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.