域名解析-delphi 源码

unit Unit1;

interface

uses
  Winapi.Windows, Winapi.Messages, System.SysUtils, System.Variants, System.Classes, Vcl.Graphics,
  Vcl.Controls, Vcl.Forms, Vcl.Dialogs,winsock, Vcl.StdCtrls;

type
  TForm1 = class(TForm)
    Edit1: TEdit;
    Edit2: TEdit;
    Button1: TButton;
    procedure Button1Click(Sender: TObject);
    procedure FormCreate(Sender: TObject);
  private
    { Private declarations }
  public
    { Public declarations }
  end;

var
  Form1: TForm1;

implementation

{$R *.dfm}

function HostToIP(Name: string; var Ip: string): Boolean;   //hosttoip 函数作用是将域名解析成ip
var
wsdata : TWSAData;
hostName : array [0..255] of AnsiChar;
hostEnt : PHostEnt;
addr : PAnsichar;
begin
WSAStartup ($0101, wsdata);
try
    gethostname (hostName, sizeof (hostName));
    StrPCopy(hostName, Name);
    hostEnt := gethostbyname (hostName);
    if Assigned (hostEnt) then
      if Assigned (hostEnt^.h_addr_list) then begin
        addr := hostEnt^.h_addr_list^;
        if Assigned (addr) then begin
          IP := Format ('%d.%d.%d.%d', [byte (addr [0]),
          byte (addr [1]), byte (addr [2]), byte (addr [3])]);
          Result := True;
        end
        else
          Result := False;
      end
      else
        Result := False
    else begin
      Result := False;
    end;
finally
    WSACleanup;
end
end;

procedure TForm1.Button1Click(Sender: TObject);
var     //定义一个字符串变量
Temp:string;
begin
HostToIP(edit1.text,Temp); //将输入的域名解析成IP
edit2.Text:=Temp; //显示在EDIT2当中

end;

procedure TForm1.FormCreate(Sender: TObject);
begin

end;

end.