On 25/06/2013 16:52, Rong lI Li wrote:
Hi, all,
Recently, I met one issue when using socket between R & C++ to transmit R
object. Would you pls help give me some suggestions? Many thanks!
R-help was really the wrong list: see the posting guide. And multiple
posting is really discouraged.
But see package 'parallel' which has lots of examples of doing this.
[Background]:
I create a socket connection between R & C++ binary first, and then, want
to use saveRDS() or save() in R to save the object into connection
directly. So that the C++ binary can read the object, and send it to
another remote R.
[What I did so far]:
1. I used socketConnection in R and listen/accept in C++, to establish one
blocking socket.
2. I used saveRDS to save the R object into socket directly
3. I want to use "recv()" in C++ to receive the R object.
[Issues I met]:
I found actually, the saveRDS writes the R object with XDR format. I could
It may do ... depending how you call it. You may prefer to serialize()
to a raw vector whose size you can find, and transmit that.
not know how many bytes are sent into socket, when calling saveRDS to save
R object. So in the C++ binary, I could not know exactly how many bytes I
should receive from the socket. It is not safe for me, to always use a
pre-defined buffer size to read from the socket.
Any suggestions for this? Are there safe way for me to read the R object
from the socket?
I do not do any conversion with the received data, and only need to
transfer them into a remote R to do the function execution.
=====================
Rong "Jessica", Li (ÀîÈÙ)
Platform Symphony TET, CSTL, IBM Systems &Technology Group, Development
Tel:86-10-82451010 Email:rong...@cn.ibm.com
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--
Brian D. Ripley, rip...@stats.ox.ac.uk
Professor of Applied Statistics, http://www.stats.ox.ac.uk/~ripley/
University of Oxford, Tel: +44 1865 272861 (self)
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