On 21 Jan 2016, at 5:44 pm, Duncan Murdoch <murdoch.duncan at gmail.com> wrote:
On 21/01/2016 11:39 AM, Tom Quarendon wrote:
I would like to implement a package that contains a C function that writes to a connection.
So the R_ext/Connections.h defines what a connection IS, but not how to get one.
What seems to work is to manually declare
Rconnection getConnection(int n);
In my C file, and while this works, and I can then use the connection object, it fails package validation with:
?Found non-API call to R: ?getConnection?
Compiled code should not call non-API entry points in R.?
So how am I supposed to do this? Is there a way? Or do I just live with the check warning (ideally not)?
The usual way to do that would be to create the connection in R code, and pass it in with your call.
If you don't know what connection you need at the time you call your C code, you can evaluate an R expression from C to do the same, but this is relatively tricky, so I'd advise the other method.
Duncan Murdoch