Functions returning structures
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From:
galdor <khae... @gmail.com> Date: Mon, 14 Dec 2009 13:29:55 -0800 (PST)
Local: Mon, Dec 14 2009 4:29 pm
Subject: Functions returning structures
Hi,
Let's define a C function which returns a plain structure:
typedef struct {
ALLEGRO_COLOR al_map_rgb(unsigned char r, unsigned char g,
Now we bind it:
class ALLEGRO_COLOR < FFI::Struct
attach_function :al_map_rgb, [:uchar, :uchar, :uchar],
But the following ruby code doesn't work:
bgcolor = al_map_rgb(20, 20, 20)
The screen is cleared with rgb(20, 40, 80), instead of rgb(20, 20,
How should I work with stack-allocated structures ?
Regards,
Nicolas Martyanoff
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From:
Wayne Meissner <wmeiss... @gmail.com> Date: Tue, 15 Dec 2009 07:33:22 +1000
Local: Mon, Dec 14 2009 4:33 pm
Subject: Re: [ruby-ffi] Functions returning structures
You need to specify the return type as ALLEGRO_COLOR.by_value
(same for any struct-by-value parameters).
2009/12/15 galdor <khae... @gmail.com>:
> Hi,
> Let's define a C function which returns a plain structure:
> typedef struct {
> ALLEGRO_COLOR al_map_rgb(unsigned char r, unsigned char g,
> Now we bind it:
> class ALLEGRO_COLOR < FFI::Struct
> attach_function :al_map_rgb, [:uchar, :uchar, :uchar],
> But the following ruby code doesn't work:
> bgcolor = al_map_rgb(20, 20, 20)
> The screen is cleared with rgb(20, 40, 80), instead of rgb(20, 20,
> How should I work with stack-allocated structures ?
> Regards,
> Nicolas Martyanoff
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From:
galdor <khae... @gmail.com> Date: Mon, 14 Dec 2009 13:42:47 -0800 (PST)
Local: Mon, Dec 14 2009 4:42 pm
Subject: Re: Functions returning structures
Thank you, it just works!
I'll notify the author of ffi-swig-generator about this, its tool
Regards,
Nicolas Martyanoff
On Dec 14, 10:33 pm, Wayne Meissner <wmeiss... @gmail.com> wrote:
> You need to specify the return type as ALLEGRO_COLOR.by_value
> (same for any struct-by-value parameters).
> 2009/12/15 galdor <khae... @gmail.com>:
> > Hi,
> > Let's define a C function which returns a plain structure:
> > typedef struct {
> > ALLEGRO_COLOR al_map_rgb(unsigned char r, unsigned char g,
> > Now we bind it:
> > class ALLEGRO_COLOR < FFI::Struct
> > attach_function :al_map_rgb, [:uchar, :uchar, :uchar],
> > But the following ruby code doesn't work:
> > bgcolor = al_map_rgb(20, 20, 20)
> > The screen is cleared with rgb(20, 40, 80), instead of rgb(20, 20,
> > How should I work with stack-allocated structures ?
> > Regards,
> > Nicolas Martyanoff
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