On Wednesday, 11 June 2014 at 14:28:49 UTC, belkin wrote:
On Wednesday, 11 June 2014 at 14:02:08 UTC, John Colvin wrote:
On Wednesday, 11 June 2014 at 13:52:09 UTC, belkin wrote:
Example: I have this C function that is compiled into a
library
//File: factorial.h
int factorial(int n);
//File: factorial.c
#include "factorial.h"
int factorial(int n)
{
if(n!=1)
return n*factorial(n-1);
}
Question: How do I use it from D?
//File: blah.d
extern(C) int factorial(int n); //coincidentally identical to
the C declaration.
void main()
{
assert(factorial(3) == 6);
}
$ gcc -c factorial.c -ofactorial.o
$ dmd blah.d factorial.o
$ ./blah
or
$ gcc -c factorial.c -ofactorial.o
$ ar rcs libfactorial.a factorial.o
$ dmd blah.d -L-lfactorial
$ ./blah
Basically, you just translate the header files from C to D,
then link to the C implementation. See
http://code.dlang.org/packages/dstep for automatic translation
of headers.
This is great.
How practical (reliable ) is it to translate a large and
complex header file like oci.h ( the interface for Oracle's
database API ) to D?
You can do a lot of it by simply doing a find and replace in the
file.
For example, all C definitions of:
unsigned char x
become:
ubyte x
So a find an replace will do that for you quite easily.
Other things like structs and typedefs are a bit more difficult
to do with a find & replace.
All the info you need is here anyway:
wiki.dlang.org/Bind_D_to_C
