C++ 获取本机IP的方法

 // #include "winsock.h"
 bool GetLocalIP(char* ip)
 {
     //1.初始化wsa
     WSADATA wsaData;
     int ret=WSAStartup(MAKEWORD(2,2),&wsaData);
     if (ret!=0)
     {
         return false;
     }
     //2.获取主机名
     char hostname[256];
     ret=gethostname(hostname,sizeof(hostname));
     if (ret==SOCKET_ERROR)
     {
         return false;
     }
     //3.获取主机ip
     HOSTENT* host=gethostbyname(hostname);
     if (host==NULL)
     {
         return false;
     }
     //4.转化为char*并拷贝返回
     strcpy(ip,inet_ntoa(*(in_addr*)*host->h_addr_list));
     return true;
 }