Thread: SDL error

I'm following this tutorial for sdl that is kind of not clear in some points so I tried to do what I could and it gave me this error

Code:

C:\Users\Bijan\Documents\C++ Programs\SDL tutorial\main.cpp|158|error: request for member `x' in `((Button*)this)->Button::box', which is of non-class type `SDL_Rect*'|

here is my code

Code:

#include <SDL/SDL.h>
#include <SDL/SDL_Image.h>
#include <string>

//screen atributes
const int SCREEN_WIDTH = 640;
const int SCREEN_HEIGHT = 480;
const int SCREEN_BPP = 32;

//the button states in the sprite sheet
int CLIP_MOUSEOVER = 0;
int CLIP_MOUSEOUT = 1;
int CLIP_MOUSEDOWN = 2;
int CLIP_MOUSEUP = 3;

//surfaces
SDL_Surface *buttonSheet = NULL;
SDL_Surface *screen = NULL;

//the event
SDL_Event event;

//the clip region of the sprite sheet
SDL_Rect clips[4];

//the button
class Button
{
    private:
    //the atributes of the button
    SDL_Rect *box;
    //the part of the button's sprite sheet that will be shown
    SDL_Rect *clip;

    public:
    //initialize the variables
    Button(int x, int y, int w, int h);
    //handles events and set the button's sprite region
    void handle_events();
    //show button on screen
    void show();
};

SDL_Surface *load_image(std::string filename){
    //the image that's loaded
    SDL_Surface *loaded_image = NULL;

    //The optimized image that will be used
    SDL_Surface *optimizedImage = NULL;

    //load the image
    loaded_image = IMG_Load(filename.c_str());

    //if image is loaded
    if(loaded_image != NULL){
        //create optimized image
        optimizedImage = SDL_DisplayFormat(loaded_image);

        //free old surface
        SDL_FreeSurface(loaded_image);

    }
    if(optimizedImage != NULL){
        //map the color key
        Uint32 colorkey = SDL_MapRGB(optimizedImage->format, 0xFF, 0xFF, 0);
        //set color key of color R 0xFF, G 0xFF, and B 0 to be transparent
        SDL_SetColorKey(optimizedImage, SDL_SRCCOLORKEY, colorkey);
    }
    return optimizedImage;
}

void apply_surface(int x, int y, SDL_Surface *source, SDL_Surface *destination, SDL_Rect *clip){
    SDL_Rect offset;

    offset.x = x;
    offset.y = y;

    SDL_BlitSurface(source, NULL, destination, &offset);
}

bool init(){
    if(SDL_Init(SDL_INIT_EVERYTHING) == -1){
        return false;
    }
    screen = SDL_SetVideoMode(SCREEN_WIDTH, SCREEN_HEIGHT, SCREEN_BPP, SDL_SWSURFACE);

    if(screen == NULL){
        return false;
    }

    //set window caption
    SDL_WM_SetCaption("TTF Test", NULL);

    return true;
}

bool load_files(){
    //load image
    buttonSheet = load_image("button.png");

    if(buttonSheet == NULL){
        return false;
    }

    return true;
}

void clean_up(){
    SDL_FreeSurface(buttonSheet);

    SDL_Quit();
}

void set_clips()
{
    //clip the sprite sheet
    clips[CLIP_MOUSEOVER].x = 0;
    clips[CLIP_MOUSEOVER].y = 0;
    clips[CLIP_MOUSEOVER].w = 320;
    clips[CLIP_MOUSEOVER].h = 240;

    clips[CLIP_MOUSEOUT].x = 320;
    clips[CLIP_MOUSEOUT].y = 0;
    clips[CLIP_MOUSEOUT].w = 320;
    clips[CLIP_MOUSEOUT].h = 240;

    clips[CLIP_MOUSEDOWN].x = 0;
    clips[CLIP_MOUSEDOWN].y = 240;
    clips[CLIP_MOUSEDOWN].w = 320;
    clips[CLIP_MOUSEDOWN].h = 240;

    clips[CLIP_MOUSEUP].x = 320;
    clips[CLIP_MOUSEUP].y = 240;
    clips[CLIP_MOUSEUP].w = 320;
    clips[CLIP_MOUSEUP].h = 240;
}

Button::Button(int x, int y, int w, int h){
    //set the button's attributes
    box.x = x;
    box.y = y;
    box.w = w;
    box.h = h;

    clip = &clips[CLIP_MOUSEOUT];
}

void Button::handle_events()
{
    //the mouse offsets
    int x = 0, y = 0;

    //if mouse is moved
    if(event.type = SDL_MOUSEMOTION){
        x = event.motion.x;
        y = event.motion.y;

        if( (x > box.x) && (x < box.x + box.w) && (y > box.y) && (y < box.y + box.h)){
            clip = &clips[CLIP_MOUSEOVER];
        }
        else{
        clip = &clips[CLIP_MOUSEOUT];
        }
        //if mouse button was pressed
        if(event.type == SDL_MOUSEBUTTONDOWN){
            //if the left button was pressed
            if(event.button.button == SDL_BUTTON_LEFT){
                //get mouse offsets
                x = event.button.x;
                y = event.button.y;

                //if the mouse is over button
                if( (x > box.x) && (x < box.x + box.w) && (y > box.y) && (y < box.y + box.h)){
                    //set button sprite
                    clip = &clips[CLIP_MOUSEDOWN];
                }
            }
        }
        //if mouse was released
        if(event.type == SDL_MOUSEBUTTONUP){
            //if left mouse button was released
            if(event.button.button == SDL_BUTTON_LEFT){
                //get mouse offsets
                x = event.button.x;
                y = event.button.y;

                //if the mouse was over the button
                if( (x > box.x) && (x < box.x + box.y) && (y > box.y) && (y < box.y + box.h)){
                    //set button to sprite
                    clip = &clips[CLIP_MOUSEUP]
                }
            }
        }
    }

    void Button::show(){
    //show sprite
    apply_surface(box.x, box.y, buttonSheet, screen, clip);
}

int main(int argc, char *args[]){
    //makes sure program waits for a quit
    bool quit = false;

    //initialize
    if(init() == false){
        return 1;
    }
    //load files
    if(load_files() == false){
        return 1;
    }


    // clip the sprite sheet
    set_clips();
    //make the button
    Button myButton(170, 120, 320, 240);

    //while the user hasn't quit yet
    while(quit == false){
        //while there is an event to handle
        while(SDL_PollEvent(&event)){
            //handle button events
            myButton.handle_events();
            //if a key was pressed
            }
            //if the users Xs out of the window
            if(event.type == SDL_QUIT){
                quit = true;
            }
            //fill the screen white
            SDL_FillRect(screen, &screen->clip_rect, SDL_MapRGB(screen->format, 0xFF, 0xFF, 0xFF);
           //update screen
           if(SDL_Flip(screen) == -1){
               return 1;
           }
           myButton.show();
        }
    }

    clean_up();

    return 0;
}

Thanks!