Thanks Duncan,
I will try gcc. In the mean time
is.loaded('planckwR',type='C') returns True
and
getNativeSymbolInfo('plankwR') returns that function name and a pointer
to it plus some other info.
It seems the function is loaded? Why does the call .C('planckwR',...)
not recognize it?
Alex van der Spek
On 01/22/2012 02:40 AM, Duncan Murdoch wrote:
On 12-01-20 10:05 AM, Alex van der Spek wrote:
First time ever that I try to call subroutines in a Win DLL using R.
Have done this before using VBA and Python.
The C code's function argument list contains only double pointers
(double *x). The function is declared void, the output value is one of
the arguments.
C calling sequence is used.
When inspecting the exports of the DLL with dumpbin I can see that the
function I need is exported under the name 'planckwR'.
Loading the DLL with dyn.load(dllpath). Works fine. getLoadedDLLs()
shows info on the 'Planck.dll' that I made. So far so good.
Made a function i R like this:
Planckw<-function(Temp) {
wavelength<-0.0
.C('planckwR',as.double(Temp),as.double(wavelength))
return(wavelength)
}
That will return 0.0 once you get the name sorted out; .C won't modify
the variable wavelength, it will return new values in a list.
Calling this function, R complains the function 'planckwR' is not in the
DLL.
I would look in the export table printed by objdump -x to check this.
I don't know the dumpbin utility.
This baffled me as I can see it in the exports table using dumpbin.
I use Visual C++ 97 compiler. Old but works. It does change the FPU
control word, which I know it should not. Working on that one too.
Any tips?
Use gcc?
Duncan Murdoch
Any help much appreciated.
Alex van der Spek
______________________________________________
R-help@r-project.org mailing list
https://stat.ethz.ch/mailman/listinfo/r-help
PLEASE do read the posting guide
http://www.R-project.org/posting-guide.html
and provide commented, minimal, self-contained, reproducible code.
______________________________________________
R-help@r-project.org mailing list
https://stat.ethz.ch/mailman/listinfo/r-help
PLEASE do read the posting guide http://www.R-project.org/posting-guide.html
and provide commented, minimal, self-contained, reproducible code.
