Hi,
Is there a recommended method using R header files for opening files from
within a DLL? I can remember reading something on this topic, but have been
unable to find it in any of the recent FAQs or in the help archive.
I'm using the C open/lseek/read/close functions with the usual C header
files
ie
#include <stdio.h>
#include <math.h>
#include <string.h>
#include <sys/types.h>
#include <sys/stat.h>
#include <fcntl.h>
#include <errno.h>
to read in a binary file. There are some system dependencies eg
#ifdef Win32
fd = open(fname, O_RDONLY | O_BINARY);
#else
fd = open(fname, O_RDONLY);
#endif
but until recently this code worked fine under Win2k and Solaris. I recompiled
the code after upgrading to V1.6 and the code still works fine under Solaris,
but under W2k it fails for larger files. First thought there was a problem
with the compilers, so followed the instructions (very clear!) in
R-1.6.0/src/gnuwin32/INSTALL, downloaded the latest set of tools and was able
to rebuild R from source. Results were unchanged.
As a workaround have written an equivalent library in R using readBin/seek as
described in the Data Import/Export manual (works fine but is slower).
Thanks for your help.
Laurens Leerink
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