高手指教：ＳＤＩ中如何动态切换视类？RUNTIME CLASS 如何用？

Question

看看《vc技术内幕》第5版的例子 EX20C

Answer 1

我没有这本书，请您发给我如何？谢谢！[email protected],先给３０分，呵呵．．．余下的收到再付．．．．再次感谢！

Answer 2

看下面的两个视由菜单动态切换的例子：
void CMainFrame::ChangeForm(int nForm)
{
CView * pOldActiveView=GetActiveView();
CView * pNewActiveView=(CView *)GetDlgItem(nForm);
if (pNewActiveView==NULL)
{
switch(nForm)
{
case IDW_ORDER_FORM:
pNewActiveView = (CView*)new CProdView;
break;
case IDW_CUST_FORM:
pNewActiveView = (CView*)new CCustView;
break;
}
CCreateContext context;
context.m_pCurrentDoc=pOldActiveView->GetDocument();
pNewActiveView->Create(NULL,NULL,0L,CFrameWnd::rectDefault,this,nForm,&context);
pNewActiveView->OnInitialUpdate();
}
SetActiveView(pNewActiveView);
pNewActiveView->ShowWindow(SW_SHOW);
pOldActiveView->ShowWindow(SW_HIDE);
if(pOldActiveView->GetRuntimeClass()==RUNTIME_CLASS(CProdView))
pOldActiveView->SetDlgCtrlID(IDW_ORDER_FORM);
else
if(pOldActiveView->GetRuntimeClass()==RUNTIME_CLASS(CCustView))
pOldActiveView->SetDlgCtrlID(IDW_CUST_FORM);
pNewActiveView->SetDlgCtrlID(AFX_IDW_PANE_FIRST);
RecalcLayout();
}void CMainFrame::OnCustomer() 
{
// TODO: Add your command handler code here
if(GetActiveView()->IsKindOf(RUNTIME_CLASS(CCustView)))
  return;
ChangeForm(IDW_CUST_FORM);

}void CMainFrame::OnUpdateCustomer(CCmdUI* pCmdUI) 
{
// TODO: Add your command update UI handler code here
pCmdUI->SetCheck(GetActiveView()->IsKindOf(RUNTIME_CLASS(CCustView)));
}void CMainFrame::OnProduct() 
{
// TODO: Add your command handler code here
    if(GetActiveView()->IsKindOf(RUNTIME_CLASS(CProdView)))
return;
ChangeForm(IDW_ORDER_FORM);
}void CMainFrame::OnUpdateProduct(CCmdUI* pCmdUI) 
{
// TODO: Add your command update UI handler code here
   pCmdUI->SetCheck(GetActiveView()->IsKindOf(RUNTIME_CLASS(CProdView)));
}