From: trebor777 <mrobert@...777.net>
Date: 2007-06-11T04:28:33+09:00
Subject: Re: Wrapping a structure as a new class...


Arf^^... nobody answered, but it's ok, I've solved my problem...
It's just because, i didnt' defined the initialize method as a singleton
method (other tutorials never told me to..., and it has always worked so...)
Anyway, it works now! Raaaah it was so simple xD



trebor777 wrote:
> 
> well i don't know if my title is exactly what i mean...
> anyway
> 
> I'm writing a C extension,  which can create a Bitmap class.(I'm using
> SDL)
> 
> So far, it's working.. for the initialization:
> 
> //========================================
> VALUE cBitmap;
> 
> void sdl_freeSurface(SDL_Surface* surface)
> {
>     SDL_FreeSurface(surface);
> }
> 
> VALUE bitmap_init(int argc, VALUE *argv, VALUE self)
> {
> SDL_Surface *new_bitmap;
> 
> if (argc == 1)
> 	{
> 	Check_Type(argv[0],T_STRING);
> 	new_bitmap=IMG_Load(STR2CSTR(argv[0]));
> 	}
> else
> 	{
> 	Check_Type(argv[0],T_FIXNUM);
> 	Check_Type(argv[1],T_FIXNUM);
> 
> new_bitmap=SDL_CreateRGBSurface(SDL_HWSURFACE,FIX2UINT(argv[0]),FIX2UINT(argv[1]),32,0,0,0,0);
> 	}
> return Data_Wrap_Struct(cBitmap,0,sdl_freeSurface,new_bitmap);
> }
> //=========================================================
> 
> when i do a=Bitmap.new(23,32)
> i got a bitmap object.
> but here comes the problem:
> 
> I got an argument type error on the class methods...(a.width for example):
> "wrong argument type Bitmap <expected Data>"
> 
> I've understand that the wrapped structure is a T_DATA object.... but all
> I want is to access this structure.
> a class method example using which try to access the struct:
> //===============================
> VALUE bitmap_width(VALUE obj)
> {
> SDL_Surface *surface;
> Data_Get_Struct(obj,SDL_Surface,surface);
> return INT2FIX(surface->w);
> }
> //===============================
> 
> If i use the 'self' argument in the Data_wrap instead of cBitmap, I can't
> create the object and got the same error:  '........ type Bitmap <expected
> Class>'
> 
> So if someone can explain me :p how to get back my structure...please. ^^
> would be great!
> 
> 
> 
> 
> 

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