[MFC] 내부IP, 외부IP가져오기

*내부 IP
//StdAfx.h에 선언
 #include "winsock2.h"

#pragma comment(lib, "WS2_32.lib")

#define DESIRED_WINSOCK_VERSION        0x0101

#define MINIMUM_WINSOCK_VERSION        0x0001

//선언 끝
//함수구현 

CString GetInIpAddress()

{

WSADATA wsadata;

CString strIP; // 이 변수에 IP주소가 저장된다.

strIP = "";

if( !WSAStartup( DESIRED_WINSOCK_VERSION, &wsadata ) )

{

if( wsadata.wVersion >= MINIMUM_WINSOCK_VERSION )

{

HOSTENT *p_host_info;

IN_ADDR in;

char host_name[128]={0, };

gethostname(host_name, 128);

p_host_info = gethostbyname( host_name );

if( p_host_info != NULL )

{

for( int i = 0; p_host_info->h_addr_list[i]; i++ )

{

memcpy( &in, p_host_info->h_addr_list[i], 4 );

strIP = inet_ntoa( in );

}

}

}

WSACleanup();

}

return strIP;

}

---

*외부 IP
#include <afxsock.h>
 
//함수구현   

CString GetIpAddress()

{

WORD wVersionRequested;

WSADATA wsaData;

char name[255];

PHOSTENT hostinfo;

CString strIpAddress = _T("");

wVersionRequested = MAKEWORD(2, 0);

if(WSAStartup(wVersionRequested, &wsaData) == 0)

{

if(gethostname(name, sizeof(name)) == 0)

{

if((hostinfo = gethostbyname(name)) != NULL)

strIpAddress = inet_ntoa (*(struct in_addr *)*hostinfo->h_addr_list);

} 

WSACleanup();

}

return strIpAddress;

}