C++如何获取本机的IP地址

#include <WinSock2.h>
#pragma comment(lib,"ws2_32")//链接到ws2_32动态链接库

class CInitSock
{
public:
  CInitSock(BYTE minorVer = 2,BYTE majorVer = 2)
  {
    WSADATA wsaData;
    WORD VersionRequset;
    VersionRequset = MAKEWORD(minorVer,majorVer);
    //装载winsock库
    if (WSAStartup(VersionRequset,&wsaData)!=0)
    {
      //装载winsock库失败，推出
      exit(0);
    }
  }
  ~CInitSock()
  {
    WSACleanup();
  }
};

#include <iostream>
#include "a.h"
using namespace std;
CInitSock Initsock;
bool GetIp();
int main()
{
  GetIp();
  return 0;
}
bool GetIp()
{
  char szText[256];
  //获取本机主机名称
  int iRet;
  iRet = gethostname(szText,256);
  int a = WSAGetLastError();
  if (iRet!=0)
  {
    printf("gethostname() Failed!");
    return FALSE;
  }
  //通过主机名获取到地址信息
  HOSTENT *host = gethostbyname(szText);
  if (NULL==host)
  {
    printf("gethostbyname() Failed!");
    return false;
  }
  in_addr PcAddr;
  for (int i=0;;i++)
  {
    char *p = host->h_addr_list[i];
    if (NULL==p)
    {
      break;
    }
    memcpy(&(PcAddr.S_un.S_addr),p,host->h_length);
    char*szIP = ::inet_ntoa(PcAddr);
    printf("本机的ip地址是：%s\n",szIP);
  }

  system("pause");
}