网络监听，可以查到包源及目的地址，可以分析数据包的内容...

计算校验和 校验和算法描述：为保证网络上传输的数据的可靠性，在许多协议中都设置了校验和项，例如：IPv4、ICMPv4、IGMPV4、ICMPv6、UDP和TCP 等等。计算这些校验和的算法称为网际校验和算法，简单来说就是：把被校验的数据１６位进行累加，然后取反码，若数据字节长度为奇数，则数据尾部补一个字节的０以凑成偶数。 由于从输入文件读入的数据不能直接满足计算校验和的条件，所以首先对从文件读入缓冲区的数据进行预处理，即读入缓冲区时忽略空格。由于累加是按16位进行的，所以每次从缓冲区中读出4个字符，并将字符转换成对应的16进制数字，如此依次累加，直至数据全部读完。 还有一种情况，即如果数据长度为奇数个字节，则需要判断，并补0累加。程序中利用的是缓冲区长度计数器i和当前读取到计数器j判断数据长度是否为奇数。即如果数据长度为偶数，则读完数据时当前读取到计数器j的值应与缓冲区长度i相等，而如果数据长度为奇数，则读完数据时，当前读取到计数器j>缓冲区长度i，此时需将缓冲区中剩余的两个字符读出，并补0，转换成相应16进制数以后参与累加。 当累加结束后，将累加和的16位以上数据位移下再进行一次累加，并对最后累加和取反即得所求校验和。 -calculated checksum checksum algorithm Description : To ensure the network transmission of data reliability, in many of the agreements are set up and calibration, for example : IPv4, ICMPv4, IGMPV4, ICMPv6. UDP and TCP so on. Calculating checksum algorithm called the Internet checksum algorithm, the simple answer is : as has been the calibration data for 16 cumulative, and then take the anti-code, if the data byte length of the odd, data will make up the tai

sockets封装的udp,主要是自己用着方便-sockets package udp, mainly with the convenience of their own

eMule其实是一个开源项目，提供了优秀的p2p文件共享，这里提供了它的最新源代码。-quad is actually an open-source project, the quality of peer-to-peer file-sharing, where it provides the latest source code.

本人课程实验做的一个基于winpcap的网络嗅探器，附源程序，用c开发，在vc++6.0下编译通过。它可以列出监视主机的所有的网卡，选择一个网卡进行监听，捕获并显示流经网卡的数据包，并做相应的分析和统计，还可以设置捕获过滤规则，就某种协议（ip、 tcp、 udp 等）进行重点分析。 -I do a course experiments based on the WinPcap network sniffer, with source code, using c development, in vc++ 6.0 compiler passed under. It can list all the host surveillance network card, select a card to monitor, capture and display data packets flowing through the network card and do the appropriate analysis and statistics, can also set filters to capture the rules of some sort of agreement on the (ip, tcp , udp, etc.) the focus of analysis.

我写的第一个多线程下载文件程序，连接是通过tcp连接的，最多可以有五个线程。-I wrote the first multi-threaded program to download files, connect through tcp connection, can have up to five threads.

网络缓冲队列操作。队列的个数由宏定义QUEUE_NUM 规定。 函数: void queueInit() char queueAdd(int index, unsigned char* pBuff, int pri) char queueDelHead(int index) char queueDelAll() 调用: 无 被调用: 网络通讯程序及用户程序的初始化部分-Network buffer queue operation. The number of queues defined by the macro QUEUE_NUM provisions. Function: void queueInit () char queueAdd (int index, unsigned char* pBuff, int pri) char queueDelHead (int index) char queueDelAll () call: None is called: network communication procedures and user program initialization part

smtp源代码集合，一共7个，包括发送和接收-smtp source code collections, a total of seven, including the sending and receiving

一个比较简单的聊天程序和大家共享一哈！通俗易懂哈！-A relatively simple chat program, and share a Ha! Easy to understand Ha!

一个基于sip的通信源代码，很详细的文档说明，值得参考和学习-A sip of communication based on source code, the document explains in great detail, it is also useful and learning

用delphi编写的一个可以换皮肤的程序，包括了所有源程序-used to prepare the skin for a procedure, including all source