判断本地连接类型的，有连接返回1，无连接返回0，需要#include <Wininet.h>，具体看文档，很简单。但很实用-To determine the type of local connection, is connected to return 1 return 0 no connection, you need to# include <Wininet.h> , Specifically to see the document, is very simple. However, it is useful