Alain wrote:

void window_getframe(t_window *x, t_symbol *sym) { char* decode; char symstr; x->sym->s_name = decode; symstr = atol(decode); frame = symstr; }

Is this the receiving function? I would write it more like:

void window_getframe(t_window *x, t_symbol *sym) { IplImage * frame;

frame = (IplImage *)atol(sym->s_name);

}

Martin