获取本机IP地址

 1 char* ip=new char[16];
 2         //1.初始化wsa
 3         WSADATA wsaData;
 4         int ret = WSAStartup(MAKEWORD(2, 2), &wsaData);
 5         if (ret == 0)
 6         { 
 7             
 8             //2.获取主机名
 9             char hostname[256];
10             ret = gethostname(hostname, sizeof(hostname));
11             if (ret != SOCKET_ERROR)
12             {
13 
14                 //3.获取主机ip
15                 HOSTENT* host = gethostbyname(hostname);
16                 if (host != NULL)
17                 {
18 
19                     //4.转化为char*并拷贝返回
20                     strcpy(ip, inet_ntoa(*(in_addr*)*host->h_addr_list)); 
21                 }
22             }
23     }