The various C integer types map to Lisp integers, so if you want to define the 0x00000010u constant you can use the Lisp value 16. (You can use Lisp's hexadecimal syntax, of course: #x10.) You may find the cl-sdl2 project <https://github.com/lispgames/cl-sdl2> interesting. You can use it and/or read its source to learn how to access SDL2 using CFFI. Cheers, Luís On Sat, 27 Jun 2020 at 13:40, oleg harput <olegharput@gmail.com> wrote:

i am trying to reach C SDL2 using CFFI, in C SDL2 there many functions like int "SDL_Init(Uint32 flags)" its return value is integer but its are arguments are defined like (in source code) #define SDL_INIT_TIMER 0x00000001u #define SDL_INIT_AUDIO 0x00000010u #define SDL_INIT_VIDEO 0x00000020u /**< SDL_INIT_VIDEO implies SDL_INIT_EVENTS */ #define SDL_INIT_JOYSTICK 0x00000200u /**< SDL_INIT_JOYSTICK implies SDL_INIT_EVENTS */ #define SDL_INIT_HAPTIC 0x00001000u #define SDL_INIT_GAMECONTROLLER 0x00002000u /**< SDL_INIT_GAMECONTROLLER implies SDL_INIT_JOYSTICK */ #define SDL_INIT_EVENTS 0x00004000u #define SDL_INIT_SENSOR 0x00008000u when calling "SDL_Init" using CFFI in CL i did not know how to call arguments like SDL_INIT_TIMER,SDL_INIT_AUDIO,SDL_INIT_VIDEO,... so i tried instead of calling them, i tried to insert their corresping values (they are hexidecimal unsigned integers in C) like (cffi:foreign-funcall "SDL_Init" :uint32 32;;for #define SDL_INIT_VIDEO 0x00000020u :int) but i am not sure that was a valid transformation or not(32 in CL corresponds to 0x00000020u in C or not) A better option is to call SDL_INIT_TIMER,SDL_INIT_AUDIO,... directly from cffi but i don not know how because they seemed undefined. Do you know how to call SDL_INIT_TIMER, SDL_INIT_AUDIO ... using CFFI? And can you tell me the transformation rules (if there are any) the numbers from C to CL using CFFI?

пт, 26 июн. 2020 г. в 23:58, Luís Oliveira <luismbo@gmail.com>:

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On Fri, 26 Jun 2020 at 20:52, oleg harput <olegharput@gmail.com> wrote:

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How can we convert C 0x00000001u (unsigned int in C) to Common Lisp using CFFI?

Can we type directly 1?(Is this a valid translation to CL?)

In what context?

-- Luís Oliveira http://kerno.org/~luis/

-- Luís Oliveira http://kerno.org/~luis/