[plt-scheme] FFI and byte-strings

Eli Barzilay skrev:
> On Feb  3, Jens Axel Søgaard wrote:
>> Hi all,
>>
>> Is there a way to go from a byte-string to a pointer
>> to the beginning of the c-array, where the actual bytes
>> are stored?
> 
> A byte string can be used whenever you need a pointer:
> 
> in "x.c":
> 
>   int foo(char *a) {
>     return a[0]+a[1]+a[2];
>   }
> 
> And in mzscheme:
> 
>   > ((get-ffi-obj 'foo "x.so" (_fun _pointer -> _int)) #"\1\2\3")
>   6

That simple!

For the record: the new FFI is brilliant.


Thanks,
-- 
Jens Axel Søgaard