socket 分别以tcp,udp两种方式通信的代码。
同一套代码，依靠不同的makefile文件，分别编译出在windows环境、linux环境、Android环境下的执行文件。,socket respectively tcp, udp communication code in two ways. The same set of code, relying on a different makefile files, respectively, lies in the windows environment to compile, linux environment, Android environment execute the file.