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)
}
Calling this function, R complains the function 'planckwR' is not in the
DLL.
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?
Any help much appreciated.
Alex van der Spek
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