Program stänger sig direkt C++

#include <SDL.h>
#include <SDL_image.h>
#include <SDL_ttf.h>
#include <SDL_mixer.h>
#include "Sprite.h"
#include <string>

const int SCREEN_WIDTH = 1024;
const int SCREEN_HEIGHT = 600;
const int SCREEN_BPP = 32;

//The surfaces
    SDL_Surface* screen = NULL;
	SDL_Surface* background = NULL;
	SDL_Surface* spriteObject = NULL;
	SDL_Surface* asteroids = NULL;
	SDL_Surface* message = NULL;
	SDL_Surface* lives = NULL;

	//Stores event data to be used.
	SDL_Event event;

	//The portions of the sprite map to be blitted
	//Only use incase of sprite sheets.
	SDL_Rect astro[16];

	//The fonts thats gonna be used.
	TTF_Font* font = NULL;
	TTF_Font* lfont = NULL;

	//The color of the font.
	SDL_Color textColor = { 255, 255, 255 };

	//Sounds
	//Music
	Mix_Music* music = NULL;

	//Sound Effects
	Mix_Chunk* laser = NULL;
	Mix_Chunk* explosion = NULL;
	Mix_Chunk* GameOver = NULL;
	[...]

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

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

		//Load the image
		loadedImage = IMG_Load( filename.c_str() );

		//If nothing went wrong in loading the image
		if( loadedImage != NULL )
		{
			//Create an optimized image
			optimizedImage = SDL_DisplayFormat( loadedImage );

			//Free the old image
			SDL_FreeSurface( loadedImage );
		}
		/*
		//If the optimized image was done just fine.
		if( optimizedImage != NULL )
		{
			//Map the color key
			Uint32 colorkey = SDL_MapRGB( optimizedImage->format, 0, 0xFF, 0xFF );

			//Sets all the pixels of color R 0, G 0xFF to be
			//transparent
			SDL_SetColorKey( optimizedImage, SDL_SRCCOLORKEY, colorkey );
		}
		*/
		//returns the optimized image
		return optimizedImage;
	}
	

	void apply_surface( int x, int y, SDL_Surface* source, SDL_Surface* destination, SDL_Rect* astro = NULL )
	{ 
		//Make a temporary rectangle to hold the offsets
		SDL_Rect offset;

		//Give the offsets to the rectangle
		offset.x = x;
		offset.y = y;

		//Blit the surface
		SDL_BlitSurface( source, astro, destination, &offset );
	}
	
	//Here is the initialization function. This function starts up SDL, sets up the window, 
	//sets the caption and returns false if there are any errors.
	bool init()
	{
		if( SDL_Init( SDL_INIT_EVERYTHING ) == -1 )
		{
			return false;
		}

		//Set up screen
		screen = SDL_SetVideoMode( SCREEN_WIDTH, SCREEN_HEIGHT, SCREEN_BPP, SDL_SWSURFACE );

		//check if screen loads correctly
		if( screen == NULL )
		{
			return false;
		}

		//Initialize SDL_ttf
		if( TTF_Init() == -1 )
		{
			return false;
		}

		///Initialize SDL_mixer
		if( Mix_OpenAudio( 22050, MIX_DEFAULT_FORMAT, 2, 4096 ) == -1 )
		{
			return false;
		}

		//Set the window caption
		SDL_WM_SetCaption( "Space Invaders", NULL );
		
		return true;
	}

	bool load_files()
	{
		//Load images
		spriteObject = load_image( "Images\\spaceship.png" );
		background = load_image( "Images\\stars-1.jpeg" );
		asteroids = load_image( "Images\\asteroid-spread-sheet.png" );

		//Open the font
		font = TTF_OpenFont( "Fonts\\SLANT.ttf", 20 );
		lfont = TTF_OpenFont( "Fonts\\SLANT.ttf", 22 );

		

		//If there was any error loading the images.
		if( spriteObject == NULL || background == NULL 
			|| asteroids == NULL )
		{
			return false;
		}
		//If there was any error loading the fonts.
		if( font == NULL || lfont == NULL )
		{
			return false;
		}

		//load music
		music = Mix_LoadMUS( "Sounds\\earlycarengine.wav" );
			
		//If there was any error loading the music
		if( music == NULL )
		{
			return false;
		}
		
		//Load sound effects
		laser = Mix_LoadWAV( "Sounds\\ray-gun" );

		//If there was any error loading the sound effects.
		if( laser == NULL )
		{
			return false;
		}

			//If everything loaded fine.
			return true;
	}

	void clean_up()
	{
		//Free's the loaded images
		SDL_FreeSurface( spriteObject );
		SDL_FreeSurface( background );
		SDL_FreeSurface( message );
		SDL_FreeSurface( asteroids );

		//Close the font that was used
		TTF_CloseFont( font );
		TTF_CloseFont( lfont );

		//Free the music files
		Mix_FreeMusic( music );

		//Free the sound effects
		Mix_FreeChunk( laser );

		//Quit SDL_mixer
		Mix_CloseAudio();

		//Quit SDL_ttf
		TTF_Quit();

		//Quit SDL
		SDL_Quit();
	}
[...]


int main( int argc, char* args[] )
{	
/*********************************************************************/
	//Initialize the sprites
	//Sprite s1("spaceship", "spaceship-sprite.gif", spriteObject);
/*********************************************************************/
	//Make sure the program waits for quit.
	bool quit = false;

	//Calls the init and file loading methods.
	if( init() == false )
		return 1;
	
	if( load_files() == false )
		return 1;
	
	//Render the fonts
	message = TTF_RenderText_Solid( font, "Score:", textColor );
	lives = TTF_RenderText_Solid( lfont, "Lives:", textColor );

	//If there was an error rendering the text
	if( message == NULL || lives == NULL )
	{
		return 1;
	}
/*************************************************************************/
	Sprite s1("spaceship", "spaceship.png", spriteObject);
/************************************************************************/
 [...]

	//Update Screen
    if( SDL_Flip( screen ) == -1 )
	{
			return 1;
	}

	//Main loop- will keep going until the user sets quit to true.
	while( quit == false )
	{
		//While there's an event to handle
		while( SDL_PollEvent( &event ) )
		{
			switch(event.type)
			{
				case SDL_QUIT://If the user presses X ( close ).
					//Quits the program
					quit = true;
					break;
				case SDL_KEYDOWN:
					switch( event.key.keysym.sym )
					{
						case SDLK_UP: 
							s1.setSpeed( 0.0, -1.0 );
							break;
						case SDLK_DOWN:
							s1.setSpeed( 0.0, 1.0 );
							break;
						case SDLK_LEFT:
							s1.setSpeed( -1.0, 0.0 );
							break;
						case SDLK_RIGHT: 
							s1.setSpeed( 1.0, 0.0 );
							break;
						case SDLK_SPACE:
							{
							//Play laser sound
							if( Mix_PlayChannel( -1, laser, 0 ) == -1 )
								return 1;
							}			
					}
			}
		}
	}

	//Update Screen
    if( SDL_Flip( screen ) == -1 )
	{
			return 1;
	}

	clean_up();

	return 0;
}

//If there was any error loading the music
		if( music == NULL )
		{
			return false;
		}

//If there was any error loading the sound effects.
		if( laser == NULL )
		{
			return false;
		}