從線上版msdn搜getaddrinfo扒下來改了一下, witch says, function gethostbyname() doesn't work well with ipv6.

#include <winsock2.h> #include <ws2tcpip.h> #include <stdio.h> #include <iostream> #pragma comment (lib, "Ws2_32.lib") int __cdecl main(int argc, char **argv) { int iResult; INT iRetval; DWORD dwRetval; int i = 1; struct addrinfo *result = NULL; struct addrinfo *ptr = NULL; struct addrinfo hints; struct sockaddr_in *sockaddr_ipv4; LPSOCKADDR sockaddr_ip; char ipstringbuffer[46]; DWORD ipbufferlength = 46; WSADATA wsaData; iResult = WSAStartup(MAKEWORD(2, 2), &wsaData); if (iResult != 0) { printf("WSAStartup failed: %d/n", iResult); return 1; } ZeroMemory( &hints, sizeof(hints) ); hints.ai_family = AF_UNSPEC; hints.ai_socktype = SOCK_STREAM; hints.ai_protocol = IPPROTO_TCP; char host_name[256] = {0}; iResult = gethostname(host_name, 256); if (iResult != 0) { WSACleanup(); return false; } //std::cout << "/nhost_name:/t" << host_name << std::endl; dwRetval = getaddrinfo(host_name, NULL, &hints, &result); if ( dwRetval != 0 ) { printf("getaddrinfo failed with error: %d/n", dwRetval); WSACleanup(); return 1; } printf("getaddrinfo returned success/n"); for(ptr=result; ptr != NULL ;ptr=ptr->ai_next) { printf("getaddrinfo response %d/n", i++); //printf("/tFlags: 0x%x/n", ptr->ai_flags); printf("/tFamily: "); switch (ptr->ai_family) { case AF_UNSPEC: printf("Unspecified/n"); break; case AF_INET: printf("AF_INET (IPv4)/n"); sockaddr_ipv4 = (struct sockaddr_in *) ptr->ai_addr; printf("/tIPv4 address %s/n", inet_ntoa(sockaddr_ipv4->sin_addr) ); break; case AF_INET6: printf("AF_INET6 (IPv6)/n"); sockaddr_ip = (LPSOCKADDR) ptr->ai_addr; ipbufferlength = 46; iRetval = WSAAddressToString(sockaddr_ip, (DWORD) ptr->ai_addrlen, NULL, ipstringbuffer, &ipbufferlength ); if (iRetval) printf("WSAAddressToString failed with %u/n", WSAGetLastError() ); else printf("/tIPv6 address %s/n", ipstringbuffer); break; case AF_NETBIOS: printf("AF_NETBIOS (NetBIOS)/n"); break; default: printf("Other %ld/n", ptr->ai_family); break; } } freeaddrinfo(result); WSACleanup(); return 0; }