Hey,
I think Günter didn't want to depend on non-public headers like g_canvas.h, so included the glist struct from that header. Personally, I think makes more sense to include the g_canvas.h header.
[parentdollarzero] like a useful object, I am not usre what [getdollarzero] does beyond [float $0] or [$0]. Anyway, hopefully they make into Pd-extended.
.hc
On Aug 27, 2007, at 4:43 PM, Thomas O Fredericks wrote:
Thanks to Han's help page (
http://puredata.info/docs/developer/mingw) I was able to compile a test external on windows with mingw.
I then started making a new external called getdollarzero based on getdir (from ggee) and parentdollarzero (from iemlib2). I compiled it and it works but I had to:
1) remove Guenter's hack from getdir's source code
2) and therefore include g_canvas.h
My question is the following: why is there a hack in the first place? If I do not use it will my code crash PD in some way (I compiled against PD 0.4 and worked fine during testing)?
As a reference, here is my code with the hack commented out :
--------- getdollarzero --------
#include "m_pd.h"
#include "g_canvas.h" //needed to include g_canvas.h once the hack was commented out
/* HACK
struct _glist
{
t_object gl_obj; // header in case we're a glist
t_gobj *gl_list; // the actual data
struct _gstub *gl_stub; // safe pointer handler
int gl_valid; // incremented when pointers might be stale
struct _glist *gl_owner; // parent glist, supercanvas, or 0 if none
};
END HACK
*/
typedef struct getdollarzero
{
t_object x_ob;
t_canvas * x_canvas;
t_outlet* x_outlet;
int x_level;
} t_getdollarzero;
static void getdollarzero_bang(t_getdollarzero *x)
{
int i = x->x_level;
t_canvas* last = x->x_canvas;
while (i>0) {
i--;
if (last->gl_owner) last = last->gl_owner;
}
// code example taken from iemlib2's parentdollarzero:
// x->s_parent_unique = canvas_realizedollar((t_canvas *)this_canvas->gl_owner, gensym("$0"));
// original get dir function:
//outlet_symbol(x->x_outlet,canvas_getdir(last));
outlet_symbol(x->x_outlet,canvas_realizedollar(last, gensym("$0")));
}
t_class *getdollarzero_class;
static void *getdollarzero_new(t_floatarg level)
{
t_getdollarzero *x = (t_getdollarzero *)pd_new(getdollarzero_class);
x->x_canvas = canvas_getcurrent();
x->x_outlet = outlet_new(&x->x_ob, &s_);
x->x_level = level;
return (void *)x;
}
void getdollarzero_setup(void)
{
getdollarzero_class = class_new(gensym("getdollarzero"), (t_newmethod)getdollarzero_new, 0,
sizeof(t_getdollarzero), 0, A_DEFFLOAT,0);
class_addbang(getdollarzero_class, getdollarzero_bang);
}
--------- getdollarzero end --------
--
thomas ouellet fredericks,
tof@danslchamp.org, montreal, canada _______________________________________________
----------------------------------------------------------------------------
Computer science is no more related to the computer than astronomy is related to the telescope. -Edsger Dykstra