getaddrinfo関数のWinsockでの使用方法

#include 
#include 
#include 
#include 
#pragma comment(lib,"ws2_32.lib")

int _tmain()
{
	//  WinSock 
	int nRet = 0;
	WSADATA wd;
	nRet = WSAStartup(MAKEWORD(2, 2), &wd);
	if (nRet != 0)
	{
		_tprintf(_T("  WinSock   ，    ：%d
"), nRet);
		_gettchar();
		return 0;
	}

	char hostName[256] = {0};
	//          
	if (gethostname(hostName, 256) != 0)
	{
		_tprintf(_T("       ，    ：%d
"), WSAGetLastError());
		goto UNLOAD;
	}
	else
		printf("   ：%s
",hostName);

	struct addrinfo aiHints;
	ZeroMemory(&aiHints, sizeof(aiHints));
	aiHints.ai_family = AF_INET;

	struct addrinfo *pAiLinkedList = NULL;//             NULL
	//                          
	nRet=getaddrinfo(
		hostName,//            IP  
		NULL,
		&aiHints,
		&pAiLinkedList//     addrinfo       
		);
	if (nRet != 0)
		_tprintf(_T("        ，    ：%d
"), nRet);
	else
	{
		struct addrinfo *pAi;
		printf("   IPv4    ：
");
		for (pAi = pAiLinkedList; pAi != NULL; pAi = pAi->ai_next)
		{
			struct sockaddr_in* pAddr = pAi->ai_addr;
			char* pszIp = inet_ntoa(pAddr->sin_addr);
			printf("\t%s
",pszIp);
		}
	}

UNLOAD:
	//  WinSock 
	if (WSACleanup() != 0)
	{
		printf(_T("  WinSock   ，    ：%d
"), WSAGetLastError());
		_gettchar();
		return 0;
	}
	_gettchar();
}