检查一个tcp或udp端口是否被占用

大家都知道ftp把，这是c++上的ftp编程，指导性的东西，，大家一起共享-We all know that the ftp, which is c++ The ftp program, guiding the things we can work together to share

本程序使用多线程搜索局域网中的所有IP地址和mac地址,仅供参考-This procedure using multi-thread search of all LAN IP address and mac address, for reference only

检查邮件服务器的邮件信息的程序源代码(支持SOCKS代理)-Check e-mail messages mail server program source code (to support the SOCKS proxy)

一个VC写的通信程序,用winsock,非CSocket 实现的聊天室程序.-VC to write a communications program, using winsock, non-CSocket realize chat room procedures.

firefox系列，扩展编程之五，一个简单的实例。-series, extended programming Five, a simple example.

一个C++ 的关于 网络入侵漏洞扫描的源代码-A C++ On network intrusion vulnerability scanning source code

C# ftp上传文件代码,配置服务器和本地目录后自动上传文件-C# ftp Uploadfile SourceCode

通过ftp自动升级程序，pb6.5以上可以打开-Ftp automatically through the upgrade process, pb6.5 can open more than

windows环境下的网络编程-windows environment of Network Programming

VB编的完善的文字聊天程序,分为服务端、客户端，可搭建企业等内部聊天器搭建-VB prepared the perfect text chat program, divided into service client, the client can set up enterprises, such as chat device structures