Re: [Pharo-users] Return value of a FFI call to a external function is its 2`s complement

Hi Pablo, correcting the type declaration in the ffiCall solved the problem, thanks! Cheers, Paulo On 10/30/2017 05:24 PM, tesonep@gmail.com wrote:

Hi,   the problem is that the Zq function has the following signature:

int zmq_msg_recv (zmq_msg_t *msg, void *socket, int flags);

And in your ffiCall you are putting #long. 

You should use the correct size of integers, as the binary numbers need to extend the size when they are negatives. 

0xFFFFFFFF is a valid positive for a long, but a -1 for an int. 

Cheers.

-- Pablo Tesone. tesonep@gmail.com <mailto:tesonep@gmail.com>