Re: how to pass a ubyte[] to c interface?

[Rikki Cattermole via Digitalmars-d-learn]

On 13/03/2015 7:47 p.m., zhmt wrote:
On Friday, 13 March 2015 at 06:39:31 UTC, Rikki Cattermole wrote:
On 13/03/2015 7:35 p.m., zhmt wrote:
ubyte[] arr ;
I pass the arr.ptr to c program, it fails silently.

Is there any way to cast a ubyte[] to a clang pointer?

Theoretically this should work.

D:

void func(ubyte[] value) {
    func(value.length, value.ptr);
}

extern(C) void func(size_t length, ubyte*);

C:
void func(size_t length, ubyte*) {
    // ...
}

Thank you for your confirm,I will try again.

Just be careful about GC pointers. They could be free'd and the c 
library thinks it is still live.
Either keep a copy of the pointer alive on the heap somewhere or tell 
the GC to ignore it.