第二篇  获取本机网络配置信息及ARP包的发送   
1、获取本机网络配置信息    
/*--------------------------------------------------------
利用IP帮助函数获取本机网络适配器名称、
MAC地址、IP地址、子网掩码及广播地址等  
---------------------------------------------------------*/    
代码如下:(说明:俺没查到为什么不能获得子网掩码,总是提示:IpMask' : undeclared identifier
PIP_ADAPTER_INFO  ad_info;   
    DWORD  uLen=0;     //DWORD和ULONG意义相同啊,与unsigned long区别,俺不知道啊                                      //但曾经吃过亏啊
    PIP_ADDR_STRING pAddrStr;
    //int nitem;

    /*-----------------------------------------------------------------
   在网上搜到的结构体的一定,俺的MSDN上查不到啊
    struct _IP_ADAPTER_INFO 中结构体的定义
    typedef   struct   _IP_ADDR_STRING   { 
          struct   _IP_ADDR_STRING*   Next; 
          IP_ADDRESS_STRING   IpAddress; 
          IP_MASK_STRING   IpMask; 
          DWORD   Context; 
  }   IP_ADDR_STRING,   *PIP_ADDR_STRING; 
  
  typedef   struct   { 
          char   String[4   *   4]; 
  }   IP_ADDRESS_STRING,   *PIP_ADDRESS_STRING,   IP_MASK_STRING,   *PIP_MASK_STRING;  
   --------------------------------------------------------------------*/
  
/*--------------------------------------------------
参数说明:m_adapt_info为列表控件对象
---------------------------------------------------*/
//一定为ad_info分配空间哦!
    ad_info=(PIP_ADAPTER_INFO)malloc(sizeof(IP_ADAPTER_INFO)); 
    if(GetAdaptersInfo(ad_info,&uLen)==ERROR_BUFFER_OVERFLOW)
    {
        TRACE("%ld\n",uLen);
        ad_info=(PIP_ADAPTER_INFO)malloc(uLen);       
    }
    if(GetAdaptersInfo(ad_info,&uLen)==ERROR_SUCCESS)
    {
        while(ad_info)
        {
            int nitem;
            switch (ad_info->Type)
            {
                case MIB_IF_TYPE_ETHERNET:
                    nitem=m_adapt_info.InsertItem(0,"Ethernet adapter");                   
                break;           
               
                case MIB_IF_TYPE_TOKENRING:
                    nitem=m_adapt_info.InsertItem(0,"Token Ring adapter");
                break;

                case MIB_IF_TYPE_FDDI:
                    nitem=m_adapt_info.InsertItem(0,"FDDI adapter");              
                break;

                case MIB_IF_TYPE_PPP:
                    nitem=m_adapt_info.InsertItem(0,"PPP adapter");          
                break;

               case MIB_IF_TYPE_LOOPBACK:
                   nitem=m_adapt_info.InsertItem(0,"Loopback adapter");
               break;

               case MIB_IF_TYPE_SLIP:
                  nitem=m_adapt_info.InsertItem(0,"Slip adapter");
               break;

               case MIB_IF_TYPE_OTHER:
               default:
                   nitem=m_adapt_info.InsertItem(0,"Other adapter ");
            }

            m_adapt_info.SetItemText(nitem,1,ad_info->AdapterName);//网卡名称

            CString   string;   
            string.Format("%2x-%2x-%2x-%2x-%2x-%2x",ad_info->Address[0],ad_info->Address[1],   
            ad_info->Address[2],ad_info->Address[3],ad_info->Address[4],ad_info->Address[5]);
            m_adapt_info.SetItemText(nitem,2,string); //网卡MAC地址

            m_adapt_info.SetItemText(nitem,3,ad_info->DhcpEnabled ? "yes" : "no"); //DHCP是否可                                                                                                                                     //用

            pAddrStr=&(ad_info->IpAddressList);
            CString str1,str2;
            while(pAddrStr)
            {
                str1+=" ";
                str2+=" ";
                str1+=pAddrStr->IpAddress.String;
                str2+=pAddrStr>IpMask.String;  //有该句总是提示:IpMask' : undeclared identifier
                                                                       //不知道为啥呀
                pAddrStr=pAddrStr->Next;
            }
            m_adapt_info.SetItemText(nitem,4,str1);  //网卡对应的IP地址
            m_adapt_info.SetItemText(nitem,5,str2);   //对应的子网掩码

            CString str3=ad_info->GatewayList.IpAddress.String;
            pAddrStr = ad_info->GatewayList.Next;
            while(pAddrStr)
            {
                str3+=" ";
                str3+=pAddrStr->IpAddress.String;
                pAddrStr=pAddrStr->Next;
            }
            m_adapt_info.SetItemText(nitem,6,str3); //默认网关

            m_adapt_info.SetItemText(nitem,7,ad_info->DhcpServer.IpAddress.String);  //DHCP服务                                                                                                                                          //器IP地址

            ad_info=ad_info->Next ;         
        }  
        free(ad_info);
    }