一个由c++编写的ocx控件。用vc++ 6.0编译，用MFC对话框调用。执行后会显示一个增加按钮，用来表示已经调用OCX控件。作为一项课堂作业，它是完美的。(An ocx control written by c+ +. Use vc++ 6.0 to compile, call with MFC dialog box. After execution, a button is displayed to indicate that the OCX control has been called