视图切换 出错

[z870248707]

在网上找了一段代码。用过来实现单文档多视图的切换。
每次调用都有内存不能访问的异常发生。


void CMainFrame::SwitchToView(int nForm)
{
//view
CView *pOldActiveView; //保存旧视图
CView *pNewActiveView;
//CDocument* pDoc = GetActiveDocument();
pOldActiveView = GetActiveView(); //保存旧视图
pNewActiveView = (CView*)GetDlgItem(nForm); //取得新视图


if(pNewActiveView==NULL)
{
switch(nForm)
//这些ID是对话框的标志符,但也可以用其他的标志
{
case IDD_PERSONAL_FORM:
pNewActiveView=(CView*)new CStudentView;
break;
case IDD_COURSEINFO_FORM:
pNewActiveView=(CView*)new CCourseInfoView;
break;
}


CCreateContext context; //将文挡和视图相连
context.m_pCurrentDoc=pOldActiveView->GetDocument();
pNewActiveView->Create(NULL, NULL, WS_CHILD ,
CFrameWnd::rectDefault, this, nForm, &context);


pNewActiveView->OnInitialUpdate();
}

if(pNewActiveView->GetRuntimeClass() == RUNTIME_CLASS(CStudentView))
pOldActiveView->SetDlgCtrlID(IDD_PERSONAL_FORM);

else if(pNewActiveView->GetRuntimeClass() ==RUNTIME_CLASS(CCourseInfoView))
pOldActiveView->SetDlgCtrlID(IDD_COURSEINFO_FORM);

pNewActiveView->SetDlgCtrlID(AFX_IDW_PANE_FIRST);

SetActiveView(pNewActiveView); //改变活动的视图
pNewActiveView->ShowWindow(SW_SHOW); //显示新的视图
pOldActiveView->ShowWindow(SW_HIDE); //隐藏旧的视图

CString title;
title.Format("已登录：%s", m_sCurUser);
pNewActiveView->GetDocument()->SetTitle(title);

delete pOldActiveView; //删除旧视图

RecalcLayout(); //调整框架窗口
}



在调试时出错后指向这一句：
pNewActiveView->Create(NULL, NULL, WS_CHILD ,
CFrameWnd::rectDefault, this, nForm, &context);

下边输出如下：
- pOldActiveView 0x004d2540 {CStudentView hWnd=???}

救命啊，我不知道是哪里出了问题了。 {CStudentView hWnd=???}这个是什么意思呀？？

[zkw0302]

把Context补充完整试下

_Context.m_pCurrentDoc = pContext->m_pCurrentDoc;
m_Context.m_pCurrentFrame = pContext->m_pCurrentFrame;
m_Context.m_pLastView = pContext->m_pLastView;
m_Context.m_pNewDocTemplate = pContext->m_pNewDocTemplate;
m_Context.m_pNewViewClass = pContext->m_pNewViewClass;

[写不动代码的人]

参考
http://www.yesky.com/97/1779597.shtml