用c++语言编写的ping程序，界面是MFC，编译环境是VC++6.0，通过ping程序的设计与实现，测试本局域网的所有机器是否在线。(Ping program written in c++ language, the interface is MFC, and the compiler environment is VC++6.0. Through the design and implementation of ping program, we test whether all the ma