vb的多个源码示例包括：打印预览、多媒体播放器 QICQ程序 图书管理程序 文件管理浏览器 字体编辑浏览器-vb multiple source code examples include: Print Preview, multimedia player QICQ program library management program File Manager Browser browser font editor

实现上位机和下位机之间的通讯,使用TCP协议(Realize the communication between the upper machine and the lower machine)