本文详细讲述了LwIP 在无操作系统支持环境下的API

函数介绍及编程应用。介绍了RAW API 的特点及优

缺点，然后逐个介绍了LwI P 提供的所有的RAW API函数，

最后通过实例的形式介绍了这些API 函数具体编程的方法。-In this paper, a detailed account of the LwIP without operating system support environment of API

Function introduction and application programming.Introduced the RAW API features and advantages

Disadvantages, and then by introduced LwI P provides all the RAW API function,

At last an example form of presentation of these API function specific programming method.