windows网络编程，利用流式套接字实现回射服务器和客户端，要求：

基于流式套接字的定长数据接收功能；

基于流式套接字的变长数据接收功能；

基于流式套接字的定长数据回射功能；

基于流式套接字的变长数据回射功能。

编程语言：C-windows network programming, using stream socket to achieve the retroreflective server and client requirements: fixed-length data reception function based on stream sockets　flow-based set of variable-length data stream socket-based receiver function　then the retroreflective function of the fixed length data word　retroreflection function based on the variable-length data stream sockets. Programming languages: C++