编译器未找到SDL_Texture

Question

So, I'm trying to make a wrapper for SDL_RenderCopy() and for some reason, I keep getting an error that says "use of undefined type 'SDL_Texture'". I have all SDL2's libraries linked and headers included. Here's the code:

void drawImage(Uint32 tex, float x, float y){
    SDL_Rect rec;
    rec.x = x;
    rec.y = y;
    if(vcTextures.size() > tex){ //If the argument is in range
        if(vcTextures[tex] != 0){ //If the index points to an image
            rec.w = vcTextures[tex]->w;
            rec.h = vcTextures[tex]->h;
            SDL_RenderCopy(gvRender, vcTextures[tex], 0, &rec);
        };
    };
};

vcTextures is of type vector<SDL_Texture*> to store the addresses of all loaded textures for easy cleanup at the end of execution. This is the only place where this happens. When I click on the message that says "see declaration of 'SDL_Texture'", it shows me the declaration, so I know the type exists as far as the file is concerned.

Here's the full error message:

1>f:\c++\xyg\xyg_runtime\graphics.cpp(125) : error C2027: use of undefined type 'SDL_Texture'
1>        d:\sdl2\vc\include\sdl_render.h(127) : see declaration of 'SDL_Texture'
1>f:\c++\xyg\xyg_runtime\graphics.cpp(125) : error C2227: left of '->w' must point to class/struct/union/generic type

Answer 1

You are not supposed to access members of SDL_Texture directly. It is an opaque type . I'm pretty sure the documentation doesn't make any mention of members w or h , so I don't know where you got the idea to do that. If you want to get information about the texture, you can use SDL_QueryTexture .

SDL_QueryTexture(vcTextures[tex], nullptr, nullptr, &rec.w, &rec.h);