c++大作業怎麼用windows API 做個窗口程序？不用MFC或者是QT這些工具。

#pragma comment(lib,"winmm.lib")

#define LENGTH 40 //遊戲場地的寬
#define WIDTH 10 //組成蛇的的正方形的邊長
#define RANGE 50 //遊戲場地與客戶去之間間隔
#define SNAKE_COLOR RGB(255,0,0) //蛇的顏色
#define BK_COLOR RGB(204,232,207) //窗體背景色
#define NO_SNAKE 0
#define HAS_SNAKE 1
#define STEP 2
#define MAKECOOR(x) (x)*WIDTH //把flags數組的下標映射為坐標

typedef struct
{
int x;
int y;
int flag;
} GRID;//蛇的結構

LRESULT CALLBACK WndProc(HWND,UINT,WPARAM,LPARAM);
void MakePartSnake(int,int,int,GRID *); //為蛇身增加或設置一個方塊
void MoveSnake(HWND); //移動蛇
void MakeFood(GRID *food); //製造隨機方塊
void initializer(); //初始化遊戲
void Manager();

TCHAR szAppName[] = TEXT("Gluttony Snake");
int flags[LENGTH][LENGTH]; //遊戲區域所有方塊的狀態標記
RECT playground; //遊戲場地
GRID *snake = NULL; //蛇所在位置數組
GRID *food = NULL; //食物對象
static int MAX_LENGTH = 0;//默認蛇分配的最大長度（可變的）
int snake_len = 0;
int direct = 0;
int WINAPI WinMain(HINSTANCE hInstance,
HINSTANCE hPrevInstance,
PSTR szCmdLine,
int iCmdShow)
{
MSG msg;
HWND hwnd;
WNDCLASS wndclass;
while(TRUE)
{
wndclass.cbClsExtra = 0;
wndclass.cbWndExtra = 0;
wndclass.hbrBackground=CreateSolidBrush(RGB(203,202,201));
wndclass.hIcon = LoadIcon(NULL,IDI_APPLICATION);
wndclass.hCursor = LoadCursor(NULL,IDC_ARROW);
wndclass.hInstance = hInstance;
wndclass.lpfnWndProc = WndProc;
wndclass.lpszMenuName = NULL;
wndclass.lpszClassName = szAppName;
wndclass.style = CS_VREDRAW | CS_HREDRAW;

if(!RegisterClass(wndclass))
{
MessageBox(NULL,TEXT("Register class failed!! Retry??"),szAppName,0);
return 0;
}
break;
}
hwnd = CreateWindow(szAppName,
TEXT("Gluttony Snake Preview V1.0.1"),
WS_OVERLAPPEDWINDOW ^ WS_THICKFRAME ^ WS_MINIMIZEBOX ^ WS_MAXIMIZEBOX,
CW_USEDEFAULT,
CW_USEDEFAULT,
CW_USEDEFAULT,
CW_USEDEFAULT,
NULL,NULL,
hInstance,
NULL);

ShowWindow(hwnd,SW_NORMAL);
UpdateWindow(hwnd);
while(TRUE)
{
if(PeekMessage(msg,NULL,0,0,PM_REMOVE))
{
if(msg.message == WM_QUIT)
break;
TranslateMessage(msg);
DispatchMessage(msg);
}
else
{
MoveSnake(hwnd);
}
}
return msg.wParam;
}
LRESULT CALLBACK WndProc(HWND hwnd,UINT message,WPARAM wParam,LPARAM lParam)
{
HDC hdc;
PAINTSTRUCT ps;
HBRUSH hBrush;
switch(message)
{
case WM_DESTROY:
PostQuitMessage(0);
return 0;

case WM_CREATE:
//PlaySound(TEXT("HG.wav"),NULL ,SND_ASYNC | SND_LOOP);//播放遊戲音樂；
initializer();
MoveWindow(hwnd,RANGE * 2,RANGE * 2,WIDTH * LENGTH + RANGE * 3,WIDTH * LENGTH + RANGE * 3,TRUE);
return 0;
case WM_KEYDOWN:
switch(wParam)
{
case VK_LEFT:
if(direct != VK_RIGHT)
direct = VK_LEFT;
break;
case VK_RIGHT:
if(direct != VK_LEFT)
direct = VK_RIGHT;
break;
case VK_UP:
if(direct != VK_DOWN)
direct = VK_UP;
break;
case VK_DOWN:
if(direct != VK_UP)
direct = VK_DOWN;
break;
default:
break;
}
return 0;

case WM_PAINT:
for(int i = 0; i != snake_len; ++i)
{
flags[(snake + i)-&>x][(snake + i)-&>y] = (snake + i)-&>flag;
}
hdc = BeginPaint(hwnd,ps);
SetViewportOrgEx(hdc,RANGE/2,RANGE,NULL);
hBrush = CreateSolidBrush(BK_COLOR);
SelectObject(hdc,hBrush);
Rectangle(hdc,playground.left,playground.top,playground.right,playground.bottom);
DeleteObject(hBrush);
hBrush = CreateSolidBrush(SNAKE_COLOR);
SelectObject(hdc,hBrush);
for(int i = 0; i != LENGTH;++i)
{
for(int j = 0; j != LENGTH;++j)
{
if(flags[i][j] == HAS_SNAKE)
{
Rectangle(hdc,MAKECOOR(i),MAKECOOR(j),MAKECOOR(i+1),MAKECOOR(j+1));
}
}
}
DeleteObject(hBrush);
EndPaint(hwnd,ps);
}
return DefWindowProc(hwnd,message,wParam,lParam);
}
//////////////////////////初始化遊戲各個參數////////////////////////////////////////////////////////////
void initializer()
{
if(snake != NULL)
free(snake);
if(food != NULL)
free(food);
snake_len = 3; //蛇的初始長度為3
direct = VK_RIGHT; //蛇的初始方向為向右
MAX_LENGTH = 100; //蛇默認最初分配最大長度為20
food = (GRID *)calloc(1,sizeof(GRID));//分配儲存food的內存
snake = (GRID *)calloc(MAX_LENGTH,sizeof(GRID));//分配儲存蛇的內存
/*************初始化遊戲場地*******************/
playground.left = 0;
playground.top = 0;
playground.right = WIDTH * LENGTH;
playground.bottom = WIDTH * LENGTH;
/**************初始化遊戲場地********************/

for(int i = 0 ;i &< LENGTH;++i) { for(int j = 0; j &< LENGTH;++j) { flags[i][j] = NO_SNAKE; } } for(int i = 0; i != snake_len;++i) { MakePartSnake(LENGTH / 2 + 2 - i,LENGTH / 2,HAS_SNAKE,(snake + i)); }///初始化蛇 MakeFood(food);///產生food } void MakePartSnake(int x,int y,int flag,GRID * snake) { snake-&>x = x;
snake-&>y = y;
snake-&>flag = flag;
}
////////////////////////////////////////////////////////////////////////////////

//////////////////控制蛇的移動///////////////////////
void MoveSnake(HWND hwnd)
{
Manager();
flags[(snake + snake_len - 1)-&>x][(snake + snake_len - 1)-&>y] = NO_SNAKE;//把蛇的尾部去除（表現為蛇移動一格）

for(int i = snake_len - 1; i &> 0;--i)
{
(snake+i)-&>x = (snake + i -1)-&>x;
(snake+i)-&>y = (snake + i -1)-&>y;
}
if(direct == VK_LEFT)
{
snake-&>x -= 1;
}
if(direct == VK_RIGHT)
{
snake-&>x += 1;
}
if(direct == VK_UP)
{
snake-&>y -= 1;
}
if(direct == VK_DOWN)
{
snake-&>y += 1;
}
InvalidateRect(hwnd,NULL,FALSE);
Sleep(200);
}
//////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////

//////////////////////////////////通過隨機生成food
void MakeFood(GRID *food)
{
srand((unsigned) time(NULL));
food-&>x = rand() % LENGTH;
food-&>y = rand() % LENGTH;
food-&>flag = HAS_SNAKE;
flags[food-&>x][food-&>y] = food-&>flag;
}
///////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////

//////////////////////////////////遊戲規則的映射及內存的處理///////////////////////////////////////////////////
void Manager()
{
if(snake_len &>= MAX_LENGTH - 2)
{
MAX_LENGTH += STEP;
snake = (GRID *)realloc(snake,MAX_LENGTH * sizeof(GRID));
}//若蛇的長度數組snake將超過所分配的內存就再次擴充分配

if(snake-&>x &< 0 || snake-&>x &>= LENGTH || snake-&>y &< 0 || snake-&>y &>= LENGTH)
{
MessageBox(NULL,TEXT("Game Over!!"),szAppName,0);
initializer();
return;
}///判斷蛇是否碰到邊界

for(int i = 4;i &< snake_len;++i) { if(snake-&>x == (snake + i)-&>x snake-&>y == (snake + i)-&>y)
{
MessageBox(NULL,TEXT("Game Over!!"),szAppName,0);
initializer();
return;
}
}////判斷蛇是否碰到自身