On Aug 13, 4:07 pm, Peter Otten <__pete...@web.de> wrote:
> inhahe wrote:
> > say i have this definition:
>
> > 1 typedef struct SDL_Surface {
> > 2 Uint32 flags; /* Read-only */
> > 3 SDL_PixelFormat *format; /* Read-only */
> > 4 int w, h; /* Read-only */
> > 5 Uint16 pitch; /* Read-only */
> > 6 void *pixels; /* Read-write */
> > 7 SDL_Rect clip_rect; /* Read-only */
> > 8 int refcount; /* Read-mostly */
> > 9
> > 10 /* This structure also contains private fields not shown here
> > */
> > 11 } SDL_Surface;
>
> > notice two pointers, format and pixels.
> > say format has this definition.
>
> > 1 typedef struct {
> > 2 SDL_Palette *palette;
> > 3 Uint8 BitsPerPixel;
> > 4 Uint8 BytesPerPixel;
> > 5 Uint8 Rloss, Gloss, Bloss, Aloss;
> > 6 Uint8 Rshift, Gshift, Bshift, Ashift;
> > 7 Uint32 Rmask, Gmask, Bmask, Amask;
> > 8 Uint32 colorkey;
> > 9 Uint8 alpha;
> > 10 } SDL_PixelFormat;
>
> > so say i want to create a mock sdl handle and pass it to some library
> > function that requires an sdl handle. (would it even work? would i
> > need to use an SDL_SWSURFACE?)
>
> > so i make the pixelformat data using struct.pack, and make the surface
> > data using struct.pack, but how do i link the surface data to the
> > pixelformat data? if i just use id() it'll give me the memory address
> > of the "box" for the string and not the string data itself. thanks.
>
> I think you are looking at the wrong module; you need ctypes, not struct.
>
> http://docs.python.org/library/ctypes.html
>
> Peter
can you (or anybody) tell me how to link one c struct to another using
ctypes? Thx
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