程序代码：

#define WIN32_LEAN_AND_MEAN
#include <iostream.h>
#include <windows.h>
#include <winsock2.h>

#pragma comment(lib,"ws2_32")

class Cinitsock
{
public:
    Cinitsock(BYTE x=2,BYTE y=2)
    {   
        WSADATA ws;
        WSAStartup( MAKEWORD(x,y),&ws );
    }
    ~Cinitsock()
    {
        WSACleanup();
    }

};

int main()
{
    Cinitsock    cinit;
   
    char szhost[256] ={0};
    gethostname(szhost,256);//获取主机名
    cout<<szhost<<endl;
    hostent* phost=gethostbyname(szhost);

    in_addr    addr;
    for (int j=0;;j++)//获取本机所有ip
    {
        char* p= phost->h_addr_list[j];
        if (!p)
        {
            break;
        }
        memcpy(&addr.S_un.S_addr,p,phost->h_length);
        char* ptr =inet_ntoa(addr);
        cout<<ptr<<endl;
    }

    return 0;
}