链接:http://www.a3gs.com/BookViews.aspInfoID=2983&ClassID=821
VC下getaddrinfo使用
编号：A3GS_TV20100114001
描述：
本文以实例代码的形式讲述了在VC中下的getaddrinfo使用。
技术实现：
头文件：
#include <winsock2.h>
#include <ws2tcpip.h>
库文件：
#pragma comment(lib,"Ws2_32.lib")
例子函数：
int _tmain(int argc, _TCHAR* argv[])
{
//-----------------------------------------
// Declare and initialize variables
WSADATA wsaData;
int iResult;
DWORD dwRetval;
int i = 1;
char *port = "633224";
struct addrinfo *result = NULL;
struct addrinfo *ptr = NULL;
struct addrinfo hints;
// Validate the parameters
if (argc != 2) {
printf("usage: %s <hostname>/n", argv[0]);
printf(" getaddrinfo provides protocol-independent translation/n");
printf( " from an ANSI host name to an IP address/n");
printf(" %s www.a3gs.com/n", argv[0]);
return 1;
}
// Initialize Winsock
iResult = WSAStartup(MAKEWORD(2, 2), &wsaData);
if (iResult != 0) {
printf("WSAStartup failed: %d/n", iResult);
return 1;
}
//--------------------------------
// Setup the hints address info structure
// which is passed to the getaddrinfo() function
ZeroMemory( &hints, sizeof(hints) );
hints.ai_family = AF_UNSPEC;
hints.ai_socktype = SOCK_STREAM;
hints.ai_protocol = IPPROTO_TCP;
//--------------------------------
// Call getaddrinfo(). If the call succeeds,
// the result variable will hold a linked list
// of addrinfo structures containing response
// information
dwRetval = getaddrinfo(argv[1], port, &hints, &result);
if ( dwRetval != 0 ) {
printf("getaddrinfo failed with error: %d/n", dwRetval);
WSACleanup();
return 1;
}
printf("getaddrinfo returned success/n");
// Retrieve each address and print out the hex bytes
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");
break;
case AF_INET6:
printf("AF_INET6 (IPv6)/n");
break;
case AF_NETBIOS:
printf("AF_NETBIOS (NetBIOS)/n");
break;
default:
printf("Other %ld/n", ptr->ai_family);
break;
}
printf("/tSocket type: ");
switch (ptr->ai_socktype) {
case 0:
printf("Unspecified/n");
break;
case SOCK_STREAM:
printf("SOCK_STREAM (stream)/n");
break;
case SOCK_DGRAM:
printf("SOCK_DGRAM (datagram) /n");
break;
case SOCK_RAW:
printf("SOCK_RAW (raw) /n");
break;
case SOCK_RDM:
printf("SOCK_RDM (reliable message datagram)/n");
break;
case SOCK_SEQPACKET:
printf("SOCK_SEQPACKET (pseudo-stream packet)/n");
break;
default:
printf("Other %ld/n", ptr->ai_socktype);
break;
}
printf("/tProtocol: ");
switch (ptr->ai_protocol) {
case 0:
printf("Unspecified/n");
break;
case IPPROTO_TCP:
printf("IPPROTO_TCP (TCP)/n");
break;
case IPPROTO_UDP:
printf("IPPROTO_UDP (UDP) /n");
break;
default:
printf("Other %ld/n", ptr->ai_protocol);
break;
}
printf("/tLength of this sockaddr: %d/n", ptr->ai_addrlen);
printf("/tCanonical name: %s/n", ptr->ai_canonname);
}
freeaddrinfo(result);
WSACleanup();
return 0;
}