用MFC做的貪吃蛇遊戲，求大神。？

HANDLE hOut;
HANDLE hIn;
unsigned long num_write;
int maxHeight=20;
int maxWidth=20;
void clearScreen()
{
CONSOLE_SCREEN_BUFFER_INFO bInfo;
GetConsoleScreenBufferInfo( hOut, bInfo );
COORD home = {0, 0};
unsigned long size =bInfo.dwSize.X * bInfo.dwSize.Y;
FillConsoleOutputAttribute(hOut, bInfo.wAttributes, size, home, num_write);
FillConsoleOutputCharacter(hOut, " ", size, home, num_write);
SetConsoleCursorPosition( hOut, home );
};
void DrawBox(int x,int y,bool isFood=false,bool background=false)
{

CONSOLE_SCREEN_BUFFER_INFO bInfo; // 窗口緩衝區信息
WORD att0,att1,attBack;
int i;
GetConsoleScreenBufferInfo( hOut, bInfo ); // 獲取窗口緩衝區信息
// 計算顯示窗口大小和位置
att0 = FOREGROUND_GREEN| BACKGROUND_RED; // 陰影屬性
att1 = FOREGROUND_RED |FOREGROUND_GREEN |FOREGROUND_BLUE | FOREGROUND_INTENSITY | BACKGROUND_RED | BACKGROUND_BLUE;// 文本屬性
attBack = BACKGROUND_INTENSITY | FOREGROUND_INTENSITY; // 文本屬性
COORD posText = {x, y};
if(!background)
FillConsoleOutputAttribute(hOut, isFood?att0:att1,1, posText, num_write);
else
{
COORD bg={0,0};
FillConsoleOutputAttribute(hOut, attBack,bInfo.dwSize.X*maxHeight, bg, num_write);
}

SetConsoleTextAttribute(hOut, bInfo.wAttributes);
};

struct SnakeNode
{
int XPos,YPos;
SnakeNode* next;
SnakeNode(int x,int y,SnakeNode*n=NULL)
:XPos(x),YPos(y),next(n)
{

}
};
SnakeNode* Head,*Food;
int DirX=1;
int DirY=0;
int StartPosX=0;
int StartPosY=0;
/*
area: ?X?
*/
void ShowSnake(SnakeNode* head)
{
DrawBox(0,0,false,true);
SnakeNode* ptr=head;
while(ptr)
{
DrawBox(ptr-&>XPos,ptr-&>YPos);
ptr=ptr-&>next;
}
}

bool UpdateSnake(SnakeNode*Head)
{
DWORD wait = 200;
Sleep(wait);

clearScreen();

INPUT_RECORD _InRec;
WORD vKey=0;
//while(true)
//{
if(PeekConsoleInput(hIn,_InRec,1,num_write))
{
vKey=_InRec.Event.KeyEvent.wVirtualKeyCode;

if(_InRec.EventType == KEY_EVENT)
{
if(vKey==37)//left
{
DirX=-1;
DirY=0;
}
else if(vKey==39)//right
{
DirX=1;
DirY=0;
}
else if(vKey==38)//up
{
DirX=0;
DirY=-1;
}
else if(vKey==40)//down
{
DirX=0;
DirY=1;
}
}

};
FlushConsoleInputBuffer(hIn);
//}
int lastX=0;
int lastY=0;
SnakeNode* ptr=Head;
if(Head-&>XPos+DirX==Food-&>XPosHead-&>YPos+DirY==Food-&>YPos)
{
//add this node
SnakeNode* oldHead=new SnakeNode(Head-&>XPos,Head-&>YPos,Head-&>next);

Head-&>XPos=Food-&>XPos;
Head-&>YPos=Food-&>YPos;
Head-&>next=oldHead;

delete Food;
Food=new SnakeNode((rand()%20)*2,(rand()%maxHeight),0);
}
else
{
while(ptr)
{

if(ptr==Head)
{
lastX=ptr-&>XPos;
lastY = ptr-&>YPos;
ptr-&>XPos+=DirX;
ptr-&>YPos+=DirY;
}
else
{
int tmp=ptr-&>XPos;
ptr-&>XPos=lastX;
lastX=tmp;

tmp=ptr-&>YPos;
ptr-&>YPos=lastY;
lastY=tmp;
}
ptr=ptr-&>next;
}
}
//check boundary
CONSOLE_SCREEN_BUFFER_INFO bInfo;
GetConsoleScreenBufferInfo( hOut, bInfo );

if(Head-&>XPos&<0||Head-&>XPos&>=bInfo.dwSize.X||
Head-&>YPos&<0||Head-&>YPos&>=maxHeight)
{
cout&<&<"Thanks for playing created by kalluwa!"; return false; } ShowSnake(Head); DrawBox(Food-&>XPos,Food-&>YPos,true);

return true;
}
int main(int argc, char** argv)
{
hOut = GetStdHandle(STD_OUTPUT_HANDLE); // 獲取標準輸出設備句柄
hIn = GetStdHandle(STD_INPUT_HANDLE);

//create snake
Head=new SnakeNode(2,1,0);
Head-&>next=new SnakeNode(1,1,0);

Food = new SnakeNode(10,10,0);

while(UpdateSnake(Head));