On 01/01/15 20:25, Yuxiang Wang wrote:
> #include <stdlib.h>
>
> __declspec(dllexport) void foobar(const int m, const int n, const
> double **x, double **y)
> {
> size_t i, j;
> y = (** double)malloc(sizeof(double *) * m);
> for(i=0; i<m; i++)
> y[i] = (*double)calloc(sizeof(double), n);
> for(i=0; i<m; i++)
> for(j=0; j<n; j++)
> y[i][j] = x[i][j];
> }
> Was I doing something wrong here?
You are not getting the data back because of the malloc/calloc
statements. The numpy array y after calling _foobar is still pointing to
its original buffer, not the new memory you allocated. You just created
a memory leak. Try this instead:
__declspec(dllexport) void foobar(const int m, const int n, const
double **x, double **y)
{
size_t i, j;
for(i=0; i<m; i++)
for(j=0; j<n; j++)
y[i][j] = x[i][j];
}
Sturla
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