SSH2是一套安全通讯协议框架（早期的SSH1由于存在安全漏洞，现在已经不用了），基于SSH2协议的产品目前主要有openssh，putty，SSH Secure Shell Client等，这些都是开源的，但是这些代码非常难懂而且复杂，一个个函数深层次的调用很快就让人在Ｃ语言代码的海洋中迷失了方向，妄图通过从这些开源软件中抽取程序代码段来“组装”自己的应用程序是非一般人所能实现的。不过还好网路上出现了一些开源的SSH2开发库，利用这些开发库开发自己的SSH2程序却要简单得多，由于这些开发库都是开源的，往往是针对linux平台的，而且一般只提供了源代码。在windows上利用这些库还必须要完成：编译有关依赖库-->编译ssh2库-->集成到开发环境（如Visual Studio）中-->熟悉SSH2库函数用法-->开始编写自己的程序。-SSH2 is a secure communications protocol fr a mework (because of earlier SSH1 vulnerability, now without a), based on SSH2 protocol products are now mainly openssh, putty, SSH Secure Shell Client and so on, these are open source, but these code is very difficult to understand and complex, deep-seated one by one function call soon people in the C language code of the ocean lost its way in a vain attempt by extraction from these procedures open source software code to "assemble" their applications non-ordinary people can achieve. Fortunately, the Internet, but there are some open source development of library SSH2, use SSH2 development libraries to develop their own procedures have to be much simpler, because these libraries are open source developers, often for the linux platform, but generally provides the source code. The windows on the use of these libraries also have to complete: compile the dependent libraries-> compile ssh2 library-> integrated into the development environment