用VB编写在网络中的通讯工具，适合小企业运用

服务器以TCP/IP提供服务时，客户端按函数调用模式调用。以屏蔽TCP/IP的具体实现。-servers to the TCP/IP to provide services, client function call by calling mode. To shield TCP/IP is a concrete realization.

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

局域网聊天工具客户端，基于sock写的，适于初学者-LAN client chat tool, based on the sock was made suitable for beginners

查看远程机器桌面的客户端程序 -The client app for viewing remote desktop

This just a simple Winsocket chat program, check it out, and feel free to give me tips and comment, through email or on this website. -This is just a simple Winsocket chat program, check it out, and feel free to give me tips and comment, through email or on this website.

IPMSG的所有原代码哦。。 有一定的学习研究作用 大家可以下载来-IPMSG Oh, all the original code. . Study has a certain role in U.S. can be downloaded to

捕获数据包-Packet capture

IEEE 802.3规范规定了以太网相关协议的具体内容，这是2008年最新版本-IEEE 802.3 Ethernet specification related to the specific content of the agreement, which is the latest version of the 2008

本程序是一个关于如何获取网卡地址的小程序，简单实用。-this is a procedure on how to access the LAN addresses small procedures, simple and practical.

本源文件是tcp的连接程序，可以当服务端或客户端，包括连接、收发数据等功能，在所有过程出错处理都较好。-origin of the document is tcp connections and can be a server or client, including connections, sending and receiving data and other functions, in all processes are better error handling.