[R] Returnin char back through the .Call interface

[Wolski]

Hi!
Thanks a lot! Its what I am looking for.

Eryk.

*********** REPLY SEPARATOR  ***********

On 2/4/2004 at 12:17 PM Roger Bivand wrote:

>On Wed, 4 Feb 2004, wolski wrote:
>
>> Hi!
>> 
>> My results or error messages are copied in a string and than have to be
>> passed back through the .Call interface togheter with numeric results
>> What is the best way to allocate storage to a character? (R_alloc?) And
>> how to add it to a list? (e.g. allocVector(VECSXP, 9))
>> 
>> 
>> Help are highly appreciated.
>
>Again, browsing the header files usually helps. A short and probably not 
>ideal example (COPY_TO_USER_STRING() does the work):
>
>SEXP R_G_get_gisrc_file() {
>      SEXP ans;
>      char *gisrc;
>      
>      PROTECT(ans=NEW_CHARACTER(1));
>      gisrc = G__get_gisrc_file();
>      if (gisrc) {
>	   gisrc = G_store(gisrc);
>           SET_STRING_ELT(ans, 0,
>                COPY_TO_USER_STRING(gisrc));
>      } else {
>           SET_STRING_ELT(ans, 0,
>                COPY_TO_USER_STRING("empty"));
>       }
>      UNPROTECT(1);
>      return(ans);
>}
>
>
>> 
>> Eryk
>> 
>> 
>> 
>> Ps.
>> I tried a with mkChar
>> and with
>> PROTECT(ral1 = NEW_CHARACTER(1));
>> 
>> ______________________________________________
>> R-help at stat.math.ethz.ch mailing list
>> https://www.stat.math.ethz.ch/mailman/listinfo/r-help
>> PLEASE do read the posting guide!
>http://www.R-project.org/posting-guide.html
>> 
>
>-- 
>Roger Bivand
>Econonic Geography Section, Department of Economics, Norwegian School of 
>Economics and Business Administration, Breiviksveien 40, N-5045 Bergen, 
>Norway, voice: +47-55959355, fax: +47-55959393; Roger.Bivand at nhh.no
>
>______________________________________________
>R-help at stat.math.ethz.ch mailing list
>https://www.stat.math.ethz.ch/mailman/listinfo/r-help
>PLEASE do read the posting guide! http://www.R-project.org/posting-guide.html



Dipl. bio-chem. Eryk Witold Wolski    @    MPI-MG Dep. Vertebrate Genomics   
Ihnestrasse 73 14195 Berlin          'v'    
tel: 0049-30-84131285               /   \    
mail: wolski at molgen.mpg.de        ---W-W----    http://www.molgen.mpg.de/~wolski