一个继承自CWnd的类的函数的目的

[sybtjp]

BOOL CHistogramCtrl::Create(DWORD dwStyle, const RECT& rect, CWnd* pParentWnd, UINT nID, CCreateContext* pContext)
{
static CString className = AfxRegisterWndClass(CS_HREDRAW | CS_VREDRAW);

return CWnd::CreateEx(WS_EX_CLIENTEDGE | WS_EX_STATICEDGE,
className, NULL, dwStyle,
rect.left, rect.top, rect.right-rect.left, rect.bottom-rect.top,
pParentWnd->GetSafeHwnd(), (HMENU) nID);
}BOOL CHistogramCtrl::Create(DWORD dwStyle, const RECT& rect, CWnd* pParentWnd, UINT nID, CCreateContext* pContext)
{
static CString className = AfxRegisterWndClass(CS_HREDRAW | CS_VREDRAW);

return CWnd::CreateEx(WS_EX_CLIENTEDGE | WS_EX_STATICEDGE,
className, NULL, dwStyle,
rect.left, rect.top, rect.right-rect.left, rect.bottom-rect.top,
pParentWnd->GetSafeHwnd(), (HMENU) nID);
}

这个函数在继承自CWnd的类中实现是为了什么啊？我从ＣＷnd继承这类的目的是为了动态画曲线．

[na_he]

重载create,然后实现注册窗口的功能亚