A small problem with bitmaps and classes in Alllegro 5

Hello. I'm programming a 2D game in Allegro, and I'm stuck in the very beggining. I have a main program and a class for the player. In that class, I have a function who draws a circle:

Code:

void PlayerBen::draw() {
         al_draw_filled_circle(x,y,30,al_map_rgb(0,0,0));
//x and y are two variables that belong to the class
     }

In my main program I have initialized some allegro stuff, and I have a circle who moves throught the screen. Everything works fine.
The problem starts when I want to create a bitmap variable to change the primitive circle for something else. I created, inside of the class, a variable ALLEGRO_BITMAP *bitmap; and I changed the code in the function draw for that:

Code:

void PlayerBen::draw() {
         al_draw_bitmap(bitmap,x,y,0);
      }

Well, the problem could be the way I inicialize the *bitmap variable. This is the constructor of the class:

Code:

PlayerBen::PlayerBen(int Vidas, int Speed, int X, int Y,ALLEGRO_BITMAP *Bitmap) {
         vidas= Vidas;
         speed= Speed;
         x= X;
         y= Y;
         bitmap= Bitmap;
     }

The parameter *Bitmap is correctly inicialized in the main program. I also draw that bitmap in the main program with the same order that I use inside my class,just for testing, and it works. But when I call the function draw, the program crash. What's happening here?

I tried to be as specific as I could, to make things easier if anyone wants to help, or ask something. Thank you in advance for the help.

You should show us the code where you create the bitmap. Are you by any chance creating the bitmap as a local variable and then passing a pointer to it, to your constructor?

Yes, I create a pointer to an ALLEGRO_BITMAP, and that pointer is what I pass to my constructor. The code is here_

In the main program, I use that part of the code to create and initialize a bitmap variable:

Code:

ALLEGRO_BITMAP *bitmap_Ben;
al_init_image_addon();
bitmap_Ben=al_create_bitmap(BITMAP_BEN_WIDTH,BITMAP_BEN_HEIGHT);
bitmap_Ben=al_load_bitmap("GuyBen.png");

And then I use the constructor to create my player:

Code:

PlayerBen player(PLAYER_INIT_LIVES, PLAYER_INIT_SPEED, PLAYER_INIT_X_POS, PLAYER_INIT_Y_POS, bitmap_Ben);

Here is also the full header file of the PlayerBen class:

Code:

#ifndef PLAYER_BEN
#define PLAYER_BEN

#include <allegro5\allegro5.h>
#include <allegro5\allegro_primitives.h>
#include <allegro5\allegro_image.h>
#include <allegro5\allegro_native_dialog.h>

namespace myPlayerBen {
    class PlayerBen {
    public:
        PlayerBen();
        PlayerBen(int Vidas, int Speed, int X, int Y,ALLEGRO_BITMAP *Bitmap);

        void moveToLeft();
        void moveToRight();

        int getLives();
        void setLives(int lives);

        void draw(ALLEGRO_DISPLAY *Display);

    private:
        ALLEGRO_BITMAP *bitmap;
        int vidas;
        int speed;
        int x;
        int y;
    };
}
#endif

I can put the full main program and the PlayerBen.cpp file if you want it.

You don't seem to be doing any error checking, both al_create_bitmap() and al_load_bitmap() returns NULL on error, try to check their return values.

I checked it. In the main function it's ok, but in the class variable the bitmap is NULL. I don't get it...

Oh, I found the mistake....I'm so silly... I had the initialation code separated in a function called init(), and in the main function I was calling init() AFTER the class constructor... ¬¬ (Oh, C'mon, I'm better than this) Thank you, anyway. Now it works completely fine.