Load the shared object/DLL

Dear All,

I have written a function in c (in a file named 'a.c') as follows,
*PLEASE* don't claim credit for the work of others (in this case it is me 
that you owe the apology and retraction to).  That is from 'S Programming' 
p. 126, and 'Writing R Extensions'.
void convolve(double *a, int *na, double *b, int *nb, double *ab)
{
int i, j, nab = *na + *nb - 1;

for(i = 0; i < nab; i++)
   ab[i] = 0.0;
for(i = 0; i < *na; i++)
   for(j = 0; j < *nb; j++)
      ab[i + j] += a[i] * b[j];
}

Then, I created a shared file in the Windows,

R CMD SHLIB -d -o a.dll a.c

Every thing is OK now.

I changed the working directory of the R environment to the directory
containing the a.dll.
I enter two commands in the R console,

dyn.load("a.dll")
is.loaded("a")
[1] FALSE

The question is that, why was the "a.dll" failed to be loaded in the R
enviroment? Which step resuted in this problem?
It did not fail.  is.loaded("a") looks for entry point "a", and you have 
"convolve".
Any suggestion was welcome.
Do note that posting guide said about where to post non-R programming 
questions.
G. Ding

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Brian D. Ripley,                  ripley at 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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Load the shared object/DLL

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