I was doing a small program to send multicast! ! ! ! ! ! ! ! ! ! ! ! !

FTP Connecting To and Retrieving FTP File Listings

hmac是一种消息验证码，我开发的这个程序可以进行任意长度的消息验证。该程序代码可以用来防止文件篡改，可以适当修改输入密码。-HMAC is a message authentication code, I developed this procedure can be of arbitrary length message authentication. The program code can be used to prevent document tampering, with appropriate modifications can enter a password.

能够根据实际需要自动制作证书以及对证书的管理-According to actual needs, as well as automatic production of a certificate of the certificate management

netstat的（网络统计），是一个命令行工具，显示网络连接。 这个程序是用winsock的在Borland的C ++ Builder的打了一个比方。

Instant Message Instant Message-Instant Message Instant M essageInstant Messa ge

采用c编写的socket套接字的服务器端程序。接收从客户端发送的信息，并向客户端发送信息。-The preparation of the socket using c socket server-side program. From the client to receive messages sent to the client send a message.

仿照WINDOWS的扫雷程序，做的不好，有BUG 大家可以自己修改。-WINDOWS modeled on de-mining program, did a poor job, there are BUG we can modify their own.

socket建立连接超时的控制 -Controlling socket when timeout

用asp.net生成随机验证码 用asp.net生成随机验证码-using random test generation Asp. Net yards with Asp. Net randomly generated test code