求助~~无法编译的问题

[zlz1981]

读windows游戏编程一书的第一个例子，因为对vc不够了解无法编译，希望各位高手指教！最好详细点，先谢谢了：）
错误信息如下：
LIBCD.LIB(crt0.obj) : error LNK2001: unresolved external symbol _main
Debug/FREAKOUT.exe : fatal error LNK1120: 1 unresolved externals
Error executing link.exe.
共有三个文件。
BLACKBOX.H BLACKBOX.CPP FREAKOUT.CPP
具体如下：
// BLACKBOX.H - Header file for demo game engine library

// watch for multiple inclusions
#ifndef BLACKBOX
#define BLACKBOX

// DEFINES ////////////////////////////////////////////////////

// default screen size
#define SCREEN_WIDTH 640 // size of screen
#define SCREEN_HEIGHT 480
#define SCREEN_BPP 8 // bits per pixel
#define MAX_COLORS 256 // maximum colors

// MACROS /////////////////////////////////////////////////////

// these read the keyboard asynchronously
#define KEY_DOWN(vk_code) ((GetAsyncKeyState(vk_code) & 0x8000) ? 1 : 0)
#define KEY_UP(vk_code) ((GetAsyncKeyState(vk_code) & 0x8000) ? 0 : 1)

// initializes a direct draw struct
#define DD_INIT_STRUCT(ddstruct) { memset(&ddstruct,0,sizeof(ddstruct)); ddstruct.dwSize=sizeof(ddstruct); }

// TYPES //////////////////////////////////////////////////////

// basic unsigned types
typedef unsigned short USHORT;
typedef unsigned short WORD;
typedef unsigned char UCHAR;
typedef unsigned char BYTE;

// EXTERNALS //////////////////////////////////////////////////

extern LPDIRECTDRAW7 lpdd; // dd object
extern LPDIRECTDRAWSURFACE7 lpddsprimary; // dd primary surface
extern LPDIRECTDRAWSURFACE7 lpddsback; // dd back surface
extern LPDIRECTDRAWPALETTE lpddpal; // a pointer to the created dd palette
extern LPDIRECTDRAWCLIPPER lpddclipper; // dd clipper
extern PALETTEENTRY palette[256]; // color palette
extern PALETTEENTRY save_palette[256]; // used to save palettes
extern DDSURFACEDESC2 ddsd; // a direct draw surface description struct
extern DDBLTFX ddbltfx; // used to fill
extern DDSCAPS2 ddscaps; // a direct draw surface capabilities struct
extern HRESULT ddrval; // result back from dd calls
extern DWORD start_clock_count; // used for timing

// these defined the general clipping rectangle
extern int min_clip_x, // clipping rectangle
max_clip_x,
min_clip_y,
max_clip_y;

// these are overwritten globally by DD_Init()
extern int screen_width, // width of screen
screen_height, // height of screen
screen_bpp; // bits per pixel

// PROTOTYPES /////////////////////////////////////////////////

// DirectDraw functions
int DD_Init(int width, int height, int bpp);
int DD_Shutdown(void);
LPDIRECTDRAWCLIPPER DD_Attach_Clipper(LPDIRECTDRAWSURFACE7 lpdds, int num_rects, LPRECT clip_list);
int DD_Flip(void);
int DD_Fill_Surface(LPDIRECTDRAWSURFACE7 lpdds,int color);

// general utility functions
DWORD Start_Clock(void);
DWORD Get_Clock(void);
DWORD Wait_Clock(DWORD count);

// graphics functions
int Draw_Rectangle(int x1, int y1, int x2, int y2, int color,LPDIRECTDRAWSURFACE7 lpdds=lpddsback);

// gdi functions
int Draw_Text_GDI(char *text, int x,int y,COLORREF color, LPDIRECTDRAWSURFACE7 lpdds=lpddsback);
int Draw_Text_GDI(char *text, int x,int y,int color, LPDIRECTDRAWSURFACE7 lpdds=lpddsback);

#endif

[zlz1981]

// BLACKBOX.CPP - Game Engine

// INCLUDES ///////////////////////////////////////////////////

#define WIN32_LEAN_AND_MEAN // make sure all macros are included


#include <windows.h> // include important windows stuff
#include <windowsx.h>
#include <mmsystem.h>

#include <iostream.h> // include important C/C++ stuff
#include <conio.h>
#include <stdlib.h>
#include <malloc.h>
#include <memory.h>
#include <string.h>
#include <stdarg.h>
#include <stdio.h>
#include <math.h>
#include <io.h>
#include <fcntl.h>

#include <ddraw.h> // directX includes
#include "blackbox.h" // game library includes

// DEFINES ////////////////////////////////////////////////////

// TYPES //////////////////////////////////////////////////////

// PROTOTYPES /////////////////////////////////////////////////

// EXTERNALS //////////////////////////////////////////////////

extern HWND main_window_handle; // save the window handle
extern HINSTANCE main_instance; // save the instance

// GLOBALS ////////////////////////////////////////////////////

LPDIRECTDRAW7 lpdd = NULL; // dd object
LPDIRECTDRAWSURFACE7 lpddsprimary = NULL; // dd primary surface
LPDIRECTDRAWSURFACE7 lpddsback = NULL; // dd back surface
LPDIRECTDRAWPALETTE lpddpal = NULL; // a pointer to the created dd palette
LPDIRECTDRAWCLIPPER lpddclipper = NULL; // dd clipper
PALETTEENTRY palette[256]; // color palette
PALETTEENTRY save_palette[256]; // used to save palettes
DDSURFACEDESC2 ddsd; // a direct draw surface description struct
DDBLTFX ddbltfx; // used to fill
DDSCAPS2 ddscaps; // a direct draw surface capabilities struct
HRESULT ddrval; // result back from dd calls
DWORD start_clock_count = 0; // used for timing

// these defined the general clipping rectangle
int min_clip_x = 0, // clipping rectangle
max_clip_x = SCREEN_WIDTH-1,
min_clip_y = 0,
max_clip_y = SCREEN_HEIGHT-1;

// these are overwritten globally by DD_Init()
int screen_width = SCREEN_WIDTH, // width of screen
screen_height = SCREEN_HEIGHT, // height of screen
screen_bpp = SCREEN_BPP; // bits per pixel

// FUNCTIONS //////////////////////////////////////////////////

[zlz1981]

// FREAKOUT.CPP - break game demo

// INCLUDES ///////////////////////////////////////////////////

#define WIN32_LEAN_AND_MEAN // include all macros
#define INITGUID // include all GUIDs

#include <windows.h> // include important windows stuff
#include <windowsx.h>
#include <mmsystem.h>

#include <iostream.h> // include important C/C++ stuff
#include <conio.h>
#include <stdlib.h>
#include <malloc.h>
#include <memory.h>
#include <string.h>
#include <stdarg.h>
#include <stdio.h>
#include <math.h>
#include <io.h>
#include <fcntl.h>

#include <ddraw.h> // directX includes
#include "blackbox.h" // game library includes

// DEFINES ////////////////////////////////////////////////////

// defines for windows
#define WINDOW_CLASS_NAME "WIN3DCLASS" // class name

#define WINDOW_WIDTH 640 // size of window
#define WINDOW_HEIGHT 480

// states for game loop
#define GAME_STATE_INIT 0
#define GAME_STATE_START_LEVEL 1
#define GAME_STATE_RUN 2
#define GAME_STATE_SHUTDOWN 3
#define GAME_STATE_EXIT 4

// block defines
#define NUM_BLOCK_ROWS 6
#define NUM_BLOCK_COLUMNS 8

#define BLOCK_WIDTH 64
#define BLOCK_HEIGHT 16
#define BLOCK_ORIGIN_X 8
#define BLOCK_ORIGIN_Y 8
#define BLOCK_X_GAP 80
#define BLOCK_Y_GAP 32

// paddle defines
#define PADDLE_START_X (SCREEN_WIDTH/2 - 16)
#define PADDLE_START_Y (SCREEN_HEIGHT - 32);
#define PADDLE_WIDTH 32
#define PADDLE_HEIGHT 8
#define PADDLE_COLOR 191

// ball defines
#define BALL_START_Y (SCREEN_HEIGHT/2)
#define BALL_SIZE 4

// PROTOTYPES /////////////////////////////////////////////////

// game console
int Game_Init(void *parms=NULL);
int Game_Shutdown(void *parms=NULL);
int Game_Main(void *parms=NULL);

// GLOBALS ////////////////////////////////////////////////////

HWND main_window_handle = NULL; // save the window handle
HINSTANCE main_instance = NULL; // save the instance
int game_state = GAME_STATE_INIT; // starting state

int paddle_x = 0, paddle_y = 0; // tracks position of paddle
int ball_x = 0, ball_y = 0; // tracks position of ball
int ball_dx = 0, ball_dy = 0; // velocity of ball
int score = 0; // the score
int level = 1; // the current level
int blocks_hit = 0; // tracks number of blocks hit

// this contains the game grid data

UCHAR blocks[NUM_BLOCK_ROWS][NUM_BLOCK_COLUMNS];

// FUNCTIONS //////////////////////////////////////////////////

[kent5566]

没有主函数

[jp1984]

是什么游戏？

[my818]

同意,看了半天没看见MAIN

[heavenchang]

也可能是楼主没有拷下来
试着设置一下多线程调试呀什么的
以及动态链接库呀什么的

[yinfuchang]

我实际上是个初学者，我看了半天也看不懂！
我也没有办法！