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我用direct　９　ＳＤＫ开发游戏，但遇到下面的问题：
BOOL csufaace::Create(int nWidth,int nHeight,COLORREF Keyvalue)
{
HRESULT ret;
LPDIRECTDRAW lpdd;
    LPDIRECTDRAW7 m_pdd;
    LPDIRECTDRAWSURFACE7 m_surface；
DDSURFACEDESC2 ddsd;
DDCOLORKEY     ddck;
ZeroMemory(&ddsd,sizeof(ddsd));
    ddsd.dwSize=sizeof(ddsd);
    ddsd.dwFlags=DDSD_CAPS|DDSD_HEIGHT|DDSD_WIDTH;

ddsd.ddsCaps.dwCaps=DDSCAPS_OFFSCREENPLAIN|DDSCAPS_SYSTEMMEMORY;
    ddsd.dwWidth=nWidth;
ddsd.dwHeight=nHeight;
ret=DirectDrawCreate(NULL,&lpdd,NULL);
if(ret!=DD_OK)
{MessageBox(NULL,"DirectDraw  Create Failed0!","hellow",MB_OK);
return FALSE;}
    ret=lpdd->QueryInterface(IID_IDirectDraw7,(LPVOID*)&m_pdd);
    if(ret!=DD_OK)
{MessageBox(NULL,"DirectDraw7  Create Failed1!","hellow",MB_OK);
return FALSE;}
    lpdd->Release();
    ret=m_pdd->CreateSurface(&ddsd,&m_surface,NULL);
if(ret!=DD_OK)
{MessageBox(NULL,"DirectDraw7 Surface Create Failed2!","hellow",MB_OK);
return FALSE;}
return 1;
}
但是总是弹出对话框　＂DirectDraw7 Surface Create Failed2＂；
高手能帮我指点一下迷津吗？谢谢！！！！

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