小弟最近照书上编了一段代码，可编译时老是有错误，各位大哥来帮帮忙啊！！！！  
代码如下：
#include<windows.h>
#include<ddraw.h>

#pragma comment(lib,"dxguid.lib")
#pragma comment(lib,"ddraw.lib")

class CDDraw
{
protected:
    BOOL   bFullScr;
    DWORD  ScreenW;
    DWORD  ScreenH;
    DWORD  ScreenC;
    HWND   hWnd;
    LPDIRECTDRAW7        lpDD;
    LPDIRECTDRAWSURFACE7 lpDDSPrimary;
    LPDIRECTDRAWSURFACE7 lpDDSBack;
…………
下面是错误，看不懂啊，

 syntax error : missing ';' before identifier 'lpDD'
 error C2501: 'LPDIRECTDRAW7' : missing storage-class or type specifiers
error C2501: 'lpDD' : missing storage-class or type specifiers
error C2146: syntax error : missing ';' before identifier 'lpDDSPrimary'
error C2501: 'LPDIRECTDRAWSURFACE7' : missing storage-class or type specifiers
…………