On 23.08.2010, at 23:16, Schwab,Wilhelm K wrote:

> Andreas,
> 
> Thanks for code, but should this not be in the image, associated in some way with ExternalAddress and/or ByteArray?
> 
> Can I simply use a ByteArray to make a buffer that I pass to an external library?  My understanding is that it could be moved by the gc (ouch!!)  Am I wrong?  If there is a way to instantiate a byte array that won't move, great.  

It won't move while you are calling that library. But it can move after return. So as long as the library does not retain a pointer to the buffer, this will work fine.

If the lib *does* retain the pointer, use ExternalAddress allocate: or gcallocate: to make the buffer, and memcpy to fill it quickly or retrieve the data.

- Bert -