C++获取本机IP地址信息

1#include<winsock2.h>  
2#include<iostream>  
3#include<string>
4using namespace std;
5#pragma comment(lib, "WS2_32.lib")
6
7string getIP()
8{
9    WSADATA WSAData;
10    char hostName[256];
11    if (!WSAStartup(MAKEWORD(2, 0),&WSAData))
12    {  
13        if(!gethostname(hostName,sizeof(hostName)))
14        {
15            hostent *host=gethostbyname(hostName);
16            if(host!=NULL)
17            {
18                return inet_ntoa(*(struct in_addr*)*host->h_addr_list);
19            }
20        }
21    }      
22    return "Get IP failed.";  
23}
24
25int main()
26{
27    cout<<"IP地址为："<<getIP()<<endl;
28    system("pause");
29    return 0;   
30}