获取与外网通讯的真实ip地址

来源：互联网发布：小键盘软件下载编辑：程序博客网时间：2024/05/18 13:06

#define STR_DEFAULTHOST ("www.sohu.com")
char* GetIpByIndex(int nIndex)
{
char* pszIp = NULL;
PIP_ADAPTER_INFO pAdapterInfo;
PIP_ADAPTER_INFO pAdapter = NULL;
DWORD dwRetVal = 0;

pAdapterInfo = (IP_ADAPTER_INFO *) malloc(sizeof(IP_ADAPTER_INFO));
ULONG ulOutBufLen = sizeof(IP_ADAPTER_INFO);
if (GetAdaptersInfo( pAdapterInfo, &ulOutBufLen) == ERROR_BUFFER_OVERFLOW)
{
free(pAdapterInfo);
pAdapterInfo = (IP_ADAPTER_INFO *) malloc (ulOutBufLen);
}

if ((dwRetVal = GetAdaptersInfo(pAdapterInfo, &ulOutBufLen)) == NO_ERROR)
{
  pAdapter = pAdapterInfo;
  while (pAdapter)
  {
   printf("/tAdapter Addr: /t%02X:%02X:%02X:%02X:%02X:%02X/n", pAdapter->Address[0],
                  pAdapter->Address[1],
                  pAdapter->Address[2],
                  pAdapter->Address[3],
                  pAdapter->Address[4],
                  pAdapter->Address[5]);
   printf("/tIP Address: /t%s/n", pAdapter->IpAddressList.IpAddress.String);
   printf("/tIP Mask: /t%s/n", pAdapter->IpAddressList.IpMask.String);
   printf("/tGateway: /t%s/n", pAdapter->GatewayList.IpAddress.String);

   if (nIndex == pAdapter->Index)
   {
    pszIp = new char[strlen(pAdapter->IpAddressList.IpAddress.String) + 1];
    strcpy(pszIp, pAdapter->IpAddressList.IpAddress.String);
    break;
   }
   pAdapter = pAdapter->Next;
  }
}

if (NULL != pAdapterInfo)
{
free(pAdapterInfo);
}
return pszIp;
}

char* GetTrueIp()
{
char* pszIp = NULL;
IPAddr ipAddr;
DWORD dwId = 0;
WSADATA wsaData;
WSAStartup(MAKEWORD(2, 2), &wsaData);
hostent* pRemoteHost = gethostbyname(STR_DEFAULTHOST);
if (NULL == pRemoteHost)
{
return pszIp;
}
memcpy(&ipAddr, pRemoteHost->h_addr_list[0], pRemoteHost->h_length);
GetBestInterface(ipAddr, &dwId);
pszIp = GetIpByIndex(dwId);
printf("ip:%s", pszIp);
return pszIp;
}