些数据或进行其他操作，比如更新视图滚动条的滚动范围。

（四）框架窗口与文档、视图之间的联系

在框架窗口被创建的时候，创建了视图，相关的函数如下：

int CFrameWnd::OnCreate(LPCREATESTRUCT lpcs)

{

       CCreateContext* pContext = (CCreateContext*)lpcs->lpCreateParams;

       return OnCreateHelper(lpcs, pContext);

}

int CFrameWnd::OnCreateHelper(LPCREATESTRUCT lpcs, CCreateContext* pContext)

{

       if (CWnd::OnCreate(lpcs) == -1)

              return -1;



       // create special children first

       if (!OnCreateClient(lpcs, pContext))

       {

              TRACE0("Failed to create client pane/view for frame.\n");

              return -1;

       }



       // post message for initial message string

       PostMessage(WM_SETMESSAGESTRING, AFX_IDS_IDLEMESSAGE);



       // make sure the child windows have been properly sized

       RecalcLayout();



       return 0;   // create ok

}

BOOL CFrameWnd::OnCreateClient(LPCREATESTRUCT, CCreateContext* pContext)

{

       // default create client will create a view if asked for it

       if (pContext != NULL && pContext->m_pNewViewClass != NULL)

       {

              if (CreateView(pContext, AFX_IDW_PANE_FIRST) == NULL)

                     return FALSE;

       }

       return TRUE;

}

CWnd* CFrameWnd::CreateView(CCreateContext* pContext, UINT nID)

{



       CWnd* pView = (CWnd*)pContext->m_pNewViewClass->CreateObject();

       if (pView == NULL)

       {

              return NULL;

       }

       ASSERT_KINDOF(CWnd, pView);



       if (!pView->Create(NULL, NULL, AFX_WS_DEFAULT_VIEW,

              CRect(0,0,0,0), this, nID, pContext))

       {

    &nb