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      <div align="center" class="btitle">将IP解释成主机名                                  <br>
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      <div align="center"><strong>Lutfi&nbspBaran                                   </strong></div>
       
      <b><br>
      　摘　要</b>：描述一个将IP解释成主机名的函数                    <br>
      <b>　关键字</b>：IP&nbspNumbers&nbsp主机                            <br>
      <b>　类　别</b>：网络                                               
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      <span class="content"><br>uses winsock<br>-------<br>function IPAddrToName(IPAddr : String): String;<br>var<br>&nbsp;&nbsp;SockAddrIn: TSockAddrIn;<br>&nbsp;&nbsp;HostEnt: PHostEnt;<br>&nbsp;&nbsp;WSAData: TWSAData;<br>begin<br>&nbsp;&nbsp;WSAStartup($101, WSAData);<br>&nbsp;&nbsp;SockAddrIn.sin_addr.s_addr:= inet_addr(PChar(IPAddr));<br>&nbsp;&nbsp;HostEnt:= gethostbyaddr(@SockAddrIn.sin_addr.S_addr, 4, AF_INET);<br>&nbsp;&nbsp;if HostEnt<>nil then<br>&nbsp;&nbsp;begin<br>&nbsp;&nbsp;&nbsp;&nbsp;result:=StrPas(Hostent^.h_name)<br>&nbsp;&nbsp;end<br>&nbsp;&nbsp;else<br>&nbsp;&nbsp;begin<br>&nbsp;&nbsp;&nbsp;&nbsp;result:='';<br>&nbsp;&nbsp;end;<br>end;<br><br>//例子：<br><br>procedure TForm1.Button1Click(Sender: TObject);<br>begin<br>Label1.Caption:=IPAddrToName(Edit1.Text);<br>end;</span> 
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