一个很好的网络服务器程序， 说明了服务器的基本编程方式，并很好的说明了服务器多线程处理方式，对初学网络编程的朋友有很好的指导意义...

PHP 动态生成图片，介绍如何利用 GD2 动态生成论坛的验证码程序-PHP dynamically generated images, how to use GD2 dynamically generated code Forum certification procedures

DNS（域名解析）程序-DNS (domain name analysis) procedure

Asincronous socket-based client-server with source code

Lesson16线程同步与异步套接字编程-Lesson16 thread synchronization with asynchronous socket programming

用VB编写在网络中的通讯工具，适合小企业运用-VB prepared in the network communication tools suitable for the small enterprise

判断一个IP是否在某个网段（子网掩码和网络地址、两个IP之间)-To determine whether an IP in a network segment (subnet mask and network address, between the two IP)

下面就给出一个简单的示例,该示例可以捕获到所有经过本地网卡的数据包,并可从中分析出协议、IP源地址、IP目标地址、TCP源端口号、TCP目标端口号以及数据包长度等信息。-Now, given a simple example, the sample can catch all through local LAN data packets can be analyzed from the agreement, IP source address, IP destination address, source port TCP, the TCP port number and the objective data packet length, and other information.

在同一个线程中使用异步套接字实现聊天室程序,避免了不读数据时出现阻塞-In the same thread realize the use of Asynchronous Sockets Chat procedures to avoid non-blocking when reading data

一个局域网的IP地址扫描器,可扫描到局域网的所有机器的名称,IP地址及MAC地址-a LAN IP address scanners, can scan all the LAN to the machine name, IP address and MAC address

本代码时对局域网中多播通信的实现，有加入多播组功能，退出多播组功能，多播显示发送接收消息等。-The code of LAN Multicast Communication, a multicast group by adding features from the multicast group function, multicast, etc. show the send receive messages.