一个SDI(单文档界面)的应用，通过File菜单中的Create New Frame命令能够创建一个位于顶层的SDI应用，但关闭主应用后其它的窗口也将关闭，程序由Visual C++ 5.0开发-an SDI (single-document interface) applications, through the File menu on the Create New Frame order to create one at the top of SDI applications, but c

关闭窗口时需要注意的东西（正确的关闭应用程序时的程序相应）-Close the window when something needs attention (right off the corresponding application program)