急，新手遇到个难题 望高手解答

sky_sky

#include "D3DWnd.h"


CD3DWnd  m_wndD3D;

m_wndD3D.CreateEx(
0, AfxRegisterWndClass(0,NULL,NULL,NULL),
"Direct3D窗口", WS_POPUP | WS_CAPTION | WS_VISIBLE,
CRect(0,50,100,200),
this, 0);

来到创建窗口时就停住了   是参数错了吗 [em2]