Hi.

Thanks for the explanation, this makes the things clear.

Can you provide a short definition of memcpy in JNA?

Regards.

2009/3/30 Timothy Wall <twal...@dev.java.net>

On Mar 21, 2009, at 4:10 PM, Stas Oskin wrote:

Hi.

Can someone advice about this - how to create a new Pointer, pointing to a copy of some part of the original Pointer?

Something like this:

function copy(p) { new_p* = malloc (30);

memcpy((p+10), new_p, 30); //Copy data from p + offset of 10

return new_p; }

Pointer p0 = ...; Pointer p1 = new Memory(30); byte[] contents = new byte[30]; p0.read(10, contents, 0, 30); p1.write(0, contents, 0, 30); Pointer p2 = p0.share(10, 30); // still points to original memory

If you want to avoid the two copies, you can simply map memcpy itself:

// NOTE: count is actually of type size_t, which may be 64 bits on some platforms Pointer memcpy(Pointer dst, Pointer src, int count);

// copy 30 bytes at offset 10 from p0 to p1 lib.memcpy(p1, p0.share(10), 30);