练习Windows程序设计，利用主机异步查询函数、服务和协议异步函数、WSACancelAsyncRequest进行域名查询的程序，包括两个例子，AsyncHost目录内的程序相对基础，QueryInfo文件夹内的是经过了完善，可查询主机, 服务, 协议信息，功能较多一些。主要练习网络Winsock的应用。-Exercises Windows program designed to host asynchronous query functions, services, and protocols for asynchronous functions the, WSACancelAsyncRequest Domain Search program, including two examples, relatively basic AsyncHost directory, folder within QueryInfo been improved, you can query the host, services, protocols, and more features. Practice network Winsock applications.