最终版

本示例主要实现了以下三点： 1. 自建了mqtt 服务端（broker）,并可以接收客户端发来的各种topic 2. 实现了客户端发布订阅mqtt消息 3. 实现了 服务端直接向外广播topic，客户端只需要 订阅该topic即可 调试步骤如下： 1. 运行>>cmd>>  cd 至 MQTTnet.TestApp.AspNetCore2 目录，并执行 dotnet run 2. 浏览器输入 http://localhost:5000 即可看到如下截图，浏览器输入 http://localhost:5000/publish 即可通过服务端发布topic

使用winsock控件进行大文件传输，初学者学习winsock编程的经典例子-controls for the use of large file transfers, beginners to learn programming protocols of the classic examples

介绍了在vc中产生随即数的常用方法，方便应用程序的开发。-rand number

java 支付宝在线支付实例源码下载(即时到帐接口)

老外网站上一个很经典的鼠标跟随效果，改变里面的2个参数可以产生截然不同的表现效果traceline-Foreigner web site is a classic mouse to follow the effect of changing the inside of the two parameters can produce very different performance results traceline

能对采集到的信号进行小波分解重构，从而进行进一步的分析(The collected signal can be decomposed and reconstructed by wavelet transform, so as to make further analysis.)

XMail is an Internet and intranet mail server featuring an SMTP server, POP3 server, finger server, multiple domains, no need for users to have a real system account, SMTP relay checking, RBL/RSS/ORBS/DUL and custom ( IP based and address based ) spam protection, SMTP authentication ( PLAIN LOGIN CRAM-MD5 POP3-before-SMTP and custom ), a POP3 account syncronizer with external POP3 accounts, account aliases, domain aliases, custom mail processing, direct mail files delivery, custom mail filters, mailing lists, remote administration, custom mail exchangers, logging, and multi-platform code. XMail sources compile under GNU/Linux, FreeBSD, OpenBSD, NetBSD, OSX, Solaris and NT/2K/XP.

实现一个16×32的跳频序列，里面有自相关的检测代码(Realization of Frequency Hopping Sequence)

多线程UDP通讯例子( Multi-thread UDP communication example )

说明：  VB环境下WinSock开发网络应用程序，取自电脑报，内附说明文档，讲解清楚(WinSock Development Environment VB web applications, from computer reports, included documentation, explain clearly)