BOOL CStatusBarDemoDlg::OnInitDialog()
{
    CDialog::OnInitDialog();

    // Set the icon for this dialog.  The framework does this automatically
    //  when the application's main window is not a dialog
    SetIcon(m_hIcon, TRUE);            // Set big icon
    SetIcon(m_hIcon, FALSE);        // Set small icon
     
    // TODO: Add extra initialization here
    //创建状态栏，并新建2个子窗格
    m_status.Create(this);
    UINT nID[] = {ID_SEPARATOR, 100};
    m_status.SetIndicators(nID, 2);
    //移动状态栏到合适的位置
    RECT rect = {0};
    GetClientRect(&rect);
    m_status.MoveWindow(0, rect.bottom - 20, rect.right - 10, 20, TRUE);
    //将第二个格子的宽度设置为80
    m_status.SetPaneInfo(0, 0, 0, rect.right - 10 - 80);
    m_status.SetPaneInfo(1, 100, 0, 80);
   
    return TRUE;  // return TRUE  unless you set the focus to a control
}
为什么把this换成GetParent（）编译就出现Debug Assertion Failed,为什么不能替换呢，还有什么情况会出现Debug Assertion Failed

感谢