得到IP

// GetIp.cpp : 定义控制台应用程序的入口点。
//

#include "stdafx.h"
#include <winsock2.h>
#include <iostream>
#pragma comment(lib,"WS2_32.lib")
using namespace std;

int _tmain(int argc, _TCHAR* argv[])
{
	WSADATA wsd;
	if(WSAStartup(MAKEWORD(2,2),&wsd) != 0)
	{
		return -1;
	}
	char szHostname[100],szHostaddress[200];
	if(gethostname(szHostname,sizeof(szHostname)) != SOCKET_ERROR)
	{
		HOSTENT *pHostEnt = gethostbyname(szHostname);
		if(pHostEnt != NULL)
		{
			sprintf(szHostaddress,"%d.%d.%d.%d",
				(pHostEnt->h_addr_list[0][0]&0x00ff),
				(pHostEnt->h_addr_list[0][1]&0x00ff),
				(pHostEnt->h_addr_list[0][2]&0x00ff),
				(pHostEnt->h_addr_list[0][3]&0x00ff));
		}
	}
	cout << szHostaddress << endl;
	return 0;
}