c++获取ip地址

// ConsoleApplication1.cpp : 定义控制台应用程序的入口点。
 //#include "stdafx.h"
 #include <WinSock2.h>
 #include <Iphlpapi.h>
 #include <iostream>
 using namespace std;
 #pragma comment(lib,"Iphlpapi.lib") //需要添加Iphlpapi.lib库int _tmain(int argc, _TCHAR* argv[])
 {
  //PIP_ADAPTER_INFO结构体指针存储本机网卡信息
  PIP_ADAPTER_INFO pIpAdapterInfo = new IP_ADAPTER_INFO();
  //得到结构体大小,用于GetAdaptersInfo参数
  unsigned long stSize = sizeof(IP_ADAPTER_INFO);
  //调用GetAdaptersInfo函数,填充pIpAdapterInfo指针变量;其中stSize参数既是一个输入量也是一个输出量
  int nRel = GetAdaptersInfo(pIpAdapterInfo, &stSize);
  //记录网卡数量
  int netCardNum = 0;
  //记录每张网卡上的IP地址数量
  int IPnumPerNetCard = 0;
  if (ERROR_BUFFER_OVERFLOW == nRel)
  {
   //如果函数返回的是ERROR_BUFFER_OVERFLOW
   //则说明GetAdaptersInfo参数传递的内存空间不够,同时其传出stSize,表示需要的空间大小
   //这也是说明为什么stSize既是一个输入量也是一个输出量
   //释放原来的内存空间
   delete pIpAdapterInfo;
   //重新申请内存空间用来存储所有网卡信息
   pIpAdapterInfo = (PIP_ADAPTER_INFO)new BYTE[stSize];
   //再次调用GetAdaptersInfo函数,填充pIpAdapterInfo指针变量
   nRel = GetAdaptersInfo(pIpAdapterInfo, &stSize);
  }
  if (ERROR_SUCCESS == nRel)
  {
   //输出网卡信息
   //可能有多网卡,因此通过循环去判断
   while (pIpAdapterInfo)
   {
    cout << "网卡数量：" << ++netCardNum << endl;
    cout << "网卡名称：" << pIpAdapterInfo->AdapterName << endl;
    cout << "网卡描述：" << pIpAdapterInfo->Description << endl;
    switch (pIpAdapterInfo->Type)
    {
    case MIB_IF_TYPE_OTHER:
     cout << "网卡类型：" << "OTHER" << endl;
     break;
    case MIB_IF_TYPE_ETHERNET:
     cout << "网卡类型：" << "ETHERNET" << endl;
     break;
    case MIB_IF_TYPE_TOKENRING:
     cout << "网卡类型：" << "TOKENRING" << endl;
     break;
    case MIB_IF_TYPE_FDDI:
     cout << "网卡类型：" << "FDDI" << endl;
     break;
    case MIB_IF_TYPE_PPP:
     printf("PP\n");
     cout << "网卡类型：" << "PPP" << endl;
     break;
    case MIB_IF_TYPE_LOOPBACK:
     cout << "网卡类型：" << "LOOPBACK" << endl;
     break;
    case MIB_IF_TYPE_SLIP:
     cout << "网卡类型：" << "SLIP" << endl;
     break;
    default:    break;
    }
    cout << "网卡MAC地址：";
    for (DWORD i = 0; i < pIpAdapterInfo->AddressLength; i++)
     if (i < pIpAdapterInfo->AddressLength - 1)
     {
      printf("%02X-", pIpAdapterInfo->Address[i]);
     }
     else
     {
      printf("%02X\n", pIpAdapterInfo->Address[i]);
     }
    cout << "网卡IP地址如下：" << endl;
    //可能网卡有多IP,因此通过循环去判断
    IP_ADDR_STRING *pIpAddrString = &(pIpAdapterInfo->IpAddressList);
    do
    {
     cout << "该网卡上的IP数量：" << ++IPnumPerNetCard << endl;
     cout << "IP 地址：" << pIpAddrString->IpAddress.String << endl;
     cout << "子网地址：" << pIpAddrString->IpMask.String << endl;
     cout << "网关地址：" << pIpAdapterInfo->GatewayList.IpAddress.String << endl;
     pIpAddrString = pIpAddrString->Next;
    } while (pIpAddrString);
    pIpAdapterInfo = pIpAdapterInfo->Next;
    cout << "--------------------------------------------------------------------" << endl;
   } }
  //释放内存空间
  if (pIpAdapterInfo)
  {
   delete pIpAdapterInfo;
  }



  return 0;
 }