C++在windows下获取本地主机ipv4地址和ipv6地址

C++在windows下获取本地主机ipv4地址和ipv6地址

#include <Winsock2.h>
#include <stdio.h>
#include <iostream>
#include <cstring>
#include<ws2tcpip.h>
#pragma comment(lib, "ws2_32.lib ")  //linking to the library
using namespace std;
int get_ip()
{
    struct addrinfo *ailist, *aip;       
    struct addrinfo hint;       
    struct sockaddr_in6 *sinp6; 
    PHOSTENT hostinfo;
    char hostname[255] = {0};      //主机名  
    char *port = "3294";                              //端口号
    const char *addr;       
    int ilRc;
    gethostname(hostname, sizeof(hostname));
    if((hostinfo = gethostbyname(hostname)) == NULL)    //获得本地ipv4地址
    {
        errno = GetLastError();
        fprintf(stderr,"gethostbyname Error:%d\n", errno);
        return 1;
    }
    LPCSTR ip;
    while(*(hostinfo->h_addr_list) != NULL)        //输出ipv4地址
    {
        ip = inet_ntoa(*(struct in_addr *) *hostinfo->h_addr_list);
        printf("ipv4 addr = %s\n\n", ip);
        hostinfo->h_addr_list++;
    }
    hint.ai_family = AF_INET6;                   /*  hint 的限定设置  */
    hint.ai_socktype = SOCK_STREAM;     /*   这里可是设置 socket type    比如  SOCK——DGRAM */
    hint.ai_flags = AI_PASSIVE;                    // flags 的标志很多  。常用的有AI_CANONNAME;
    hint.ai_protocol = 0;                               /*  设置协议  一般为0，默认 */        
    hint.ai_addrlen = 0;                                /*  下面不可以设置，为0，或者为NULL  */
    hint.ai_canonname = NULL;       
    hint.ai_addr = NULL;       
    hint.ai_next = NULL;
    ilRc = getaddrinfo(hostname, port, &hint, &ailist);    /*通过主机名获得地址信息*/     
    if (ilRc < 0)       
    {              
        char str_error[100];               
        strcpy(str_error, (char *)gai_strerror(errno));               
        printf("str_error = %s", str_error);               
        return 0;       
    }
    if(ailist == NULL)
    {
        printf("sorry not find the IP address,please try again \n");
    }
    for (aip = ailist; aip != NULL; aip = aip->ai_next)                         /* 显示获取的信息  */
    {                      
        aip->ai_family == AF_INET6;
        sinp6 = (struct sockaddr_in6 *)aip->ai_addr;                                  /* 为什么是for 循环 ，先向下看 */
        int i;
        printf("ipv6 addr = ");
        for(i = 0; i < 16; i++)
        {
            if(((i-1)%2) && (i>0))
            {
                printf(":");
            }
            printf("%02x",sinp6->sin6_addr.u.Byte[i]);    
        }
        printf(" \n");
        printf(" \n"); 
    }
    while(1);  
}
int main(){
 
    WORD wVersionRequested;
    WSADATA wsaData;
    int err;   
    wVersionRequested = MAKEWORD( 1, 1 );
    err = WSAStartup( wVersionRequested, &wsaData );//initiate the ws2_32.dll and match the version
    if ( err != 0 )
    {
        return 0;
    }
    if ( LOBYTE( wsaData.wVersion ) != 1 ||   //if the version is not matched ,then quit and terminate the ws3_32.dll
        HIBYTE( wsaData.wVersion ) != 1 )
    {
        WSACleanup( );
        return 0;
    }
    get_ip();
    return 0;
}

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