在CMainFrame类中添加下列成员变量和成员函数(使用ClassWizard)，下面是这些变量和函数的功能说明：
成员变量：
BOOL m_bFullScreen; //全屏幕显示标志
CRect m_FullScreenWindowRect; //全屏幕显示窗口Rect
WINDOWPLACEMENT m_wpPrev; //用于保存正常视图时的窗口位置信息
CToolBar * m_wndFullScreenBar; //全屏幕显示时的浮动工具条
成员函数：
void OnMenuFullscreen(); //全屏幕显示的处理函数
void OnGetMinMaxInfo(); //捕获WM_GETMINMAXINFO消息以便允许你增加窗口大小
void OnUpdateViewFullScreen(); //更新“全屏幕显示”菜单的状态
源码
void CMainFrame::OnMenuFullscreen()
{//全屏幕显示的处理函数
RECT rectDesktop;
WINDOWPLACEMENT wpNew;
if (m_bFullScreen)
{//全屏幕显示模式
//隐藏工具条和状态条
m_wndStatusBar.ShowWindow(SW_HIDE);
m_wndToolBar.ShowWindow(SW_HIDE);
//保存正常视图时的窗口位置信息以便恢复原来状态
GetWindowPlacement (&m_wpPrev);
m_wpPrev.length = sizeof m_wpPrev;
//调整RECT为新的窗口尺寸
::GetWindowRect ( ::GetDesktopWindow(), &rectDesktop );
::AdjustWindowRectEx(&rectDesktop, GetStyle(), TRUE, GetExStyle());
//保存RECT以便OnGetMinMaxInfo()使用
m_FullScreenWindowRect = rectDesktop;
wpNew = m_wpPrev;
wpNew.showCmd = SW_SHOWNORMAL;
wpNew.rcNormalPosition = rectDesktop;
//生成新的工具条
m_wndFullScreenBar=new CToolBar;
if(!m_wndFullScreenBar->Create(this, CBRS_SIZE_DYNAMIC|CBRS_FLOATING)
|| !m_wndFullScreenBar->LoadToolBar(IDR_FULLSCREEN))
{
TRACE0("Failed to create toolbar\n");
return; // fail to create
}
//不允许工具条停泊
m_wndFullScreenBar->EnableDocking(FALSE);
m_wndFullScreenBar->SetWindowPos(0,100,100,0,0,SWP_NOSIZE
|SWP_NOZORDER|SWP_NOACTIVATE|SWP_SHOWWINDOW);
m_wndFullScreenBar->SetWindowText(_T("全屏幕显示"));
FloatControlBar(m_wndFullScreenBar, CPoint(100,100));
m_bFullScreen=TRUE;
}
else
{//正常显示模式
//删除全屏幕工具条
m_wndFullScreenBar->DestroyWindow();
delete m_wndFullScreenBar;
m_bFullScreen=FALSE;
//恢复工具条和状态条
m_wndStatusBar.ShowWindow(SW_SHOWNORMAL);
m_wndToolBar.ShowWindow(SW_SHOWNORMAL);
wpNew = m_wpPrev;
}
//设置窗口显示状态
SetWindowPlacement ( &wpNew );
}
void CMainFrame::OnGetMinMaxInfo(MINMAXINFO FAR* lpMMI)
{
if (m_bFullScreen)
{
lpMMI->ptMaxSize.y = m_FullScreenWindowRect.Height();
lpMMI->ptMaxTrackSize.y = lpMMI->ptMaxSize.y;
lpMMI->ptMaxSize.x = m_FullScreenWindowRect.Width();
lpMMI->ptMaxTrackSize.x = lpMMI->ptMaxSize.x;
}
}
void CMainFrame::OnUpdateMenuFullscreen(CCmdUI* pCmdUI)
{//更新菜单的状态
pCmdUI->Enable();
pCmdUI->SetCheck(m_bFullScreen);
} 
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