[R] R strings from C

Ott Toomet siim at obs.ee
Wed Dec 19 21:18:09 CET 2001


I am trying to study R internal behaviour.  So long, I have not
succeeded to access the value of R strings from C.

I use:

void salvesta_tabel(
		    SEXP data_frame,
		    SEXP file
  printf( "nimi %d\n", (R_CHAR)( file));

and from the R side:

salvesta.tabel <-
  function (x, file = "") {
    .Call( "salvesta_tabel", x, file)

When calling from R as

salvesta.tabel( x, "file")

R always crashes while printing the %d part.  So I assume that the
function R_CHAR is not the right one to access the value of the
variable file, I have experimented several other ways but so long
unsuccessfully, both Venables & Ripley ,S-programming' and ,Writing R
extensions' seem not to touch that issue.

Any suggestions?

And thanks in advance,

Ott Toomet

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