unit1.pas

准确获取远程WEB页面的最新更新日期及时间

{
  Get Last-Modified Time Demo Unit
  This unit is to show how to get page's last modified time by using http.

  Author:Pan Ying
  E-Mail:[e-mail]
  Web:http://zeroworld.533.net
  }

unit Unit1;

interface

uses
  Windows, Messages, SysUtils, Classes, Graphics, Controls, Forms, Dialogs,
  StdCtrls, Psock, NMHttp;

type
  TForm1 = class(TForm)
    NMHTTP1: TNMHTTP;
    Button1: TButton;
    Edit1: TEdit;
    Label1: TLabel;
    Button2: TButton;
    procedure Button2Click(Sender: TObject);
    procedure Button1Click(Sender: TObject);
    procedure NMHTTP1Success(Cmd: CmdType);
  private
    { Private declarations }
  public
    { Public declarations }
  end;

var
  Form1: TForm1;

implementation

{$R *.DFM}

procedure TForm1.Button2Click(Sender: TObject);
begin
  Close;
end;

procedure TForm1.Button1Click(Sender: TObject);
begin
  NMHttp1.Head(Edit1.Text);
end;

procedure TForm1.NMHTTP1Success(Cmd: CmdType);
var
  i:integer;
  TempString:string;
  OneHead:string;
  ModifiedTime:string;
begin
  TempString:=NMHttp1.Header;
  ModifiedTime:='';
  repeat
    i:=pos(#13+#10,TempString);
    if i=0 then
      i:=Length(Tempstring)+1;
    if i<>0 then
    begin
      OneHead:=Copy(TempString,1,i-1);
      Delete(TempString,1,i-1);
      if Length(TempString)>0 then
        Delete(Tempstring,1,2);

      if pos('LAST-MODIFIED:',uppercase(OneHead))>0 then
        ModifiedTime:=OneHead;
    end;
  until Length(TempString)=0;

  if Length(ModifiedTime)>0 then
    ShowMessage(ModifiedTime);
end;

end.