On 21/01/2016 1:07 PM, Tom Quarendon wrote:
So upshot is that I can only do why I want by using the function that's not
part of the api, or just not using connections at all and just using normal C
file io, opened from C, and simply pass the file name in instead, rather than a
proper connection object?
You could also call R from C to do the I/O for you.
Duncan Murdoch
On 21 Jan 2016, at 6:04 pm, Duncan Murdoch <murdoch.dun...@gmail.com> wrote:
On 21/01/2016 12:50 PM, Tom Quarendon wrote:
But that's what I want to do, create the connection in R code and pass it on to
the C function.
My question is, how do I do that?
You appear to need the C getConnection entry point, but it's not part of the
API.
So I'm wondering how I'm supposed to do what you describe.
Sorry, my advice was wrong. I remembered that we exposed code to create new
connections, and assumed it had some code to work with them, but it doesn't.
Duncan Murdoch
Sorry if I was unclear.
Sent from my iPhone
On 21 Jan 2016, at 5:44 pm, Duncan Murdoch <murdoch.dun...@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
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