unit1.pas

用delphi编写的网站后台扫描器--单线程

unit Unit1;

interface

uses
  Windows, Messages, SysUtils, Variants, Classes, Graphics, Controls, Forms,
  Dialogs, StdCtrls, ComCtrls,wininet;

type
  TForm1 = class(TForm)
    Button1: TButton;
    Edit1: TEdit;
    ListBox1: TListBox;
    StatusBar1: TStatusBar;
    Label1: TLabel;
    Button2: TButton;
    Memo1: TMemo;
    OpenDialog1: TOpenDialog;
    procedure Button2Click(Sender: TObject);
    procedure FormCreate(Sender: TObject);
    procedure Button1Click(Sender: TObject);
  private
    { Private declarations }
  public
    { Public declarations }
  end;

var
  Form1: TForm1;

   proc:tprogressbar;   //全局变量
implementation

{$R *.dfm}
//====================== 判断网址是否存在的函数 =======================
function CheckUrl(url: string; TimeOut: integer = 5000): boolean;
var
  hSession, hfile, hRequest: hInternet;
  dwindex, dwcodelen: dword;
  dwcode: array[1..20] of char;
  res: pchar;
  re: integer;
  Err1: integer;
  j: integer;
begin
  if pos('http://', lowercase(url)) = 0 then
    url := 'http://' + url;
  Result := false;
  InternetSetOption(hSession, Internet_OPTION_CONNECT_TIMEOUT, @TimeOut, 4);
  hSession := InternetOpen('Mozilla/4.0', INTERNET_OPEN_TYPE_PRECONFIG, nil, nil, 0);
   //设置超时
  if assigned(hsession) then
  begin
    j := 1;
    while true do
    begin
      hfile := InternetOpenUrl(hsession, pchar(url), nil, 0, INTERNET_FLAG_RELOAD, 0);
   if hfile = nil then
      begin
        j := j + 1;
        Err1 := GetLastError;
        if j > 5 then break;
        if (Err1 <> 12002) or (Err1 <> 12152) then break;
        sleep(2);
      end
      else begin
        break;
      end;
    end;
    dwIndex := 0;
    dwCodeLen := 10;
    HttpQueryInfo(hfile, HTTP_QUERY_STATUS_CODE, @dwcode, dwcodeLen, dwIndex);
    res := pchar(@dwcode);
    re := strtointdef(res, 404);
    case re of
      400..450: result := false;   //如果返回400到500消息头，表示文件不存在
    else result := true;   //否则表示文件存在
    end;
    if assigned(hfile) then
      InternetCloseHandle(hfile);
      InternetCloseHandle(hsession);
    end;
end;

procedure TForm1.Button2Click(Sender: TObject);
var
   i:integer;
begin
   for i:=0 to memo1.Lines.Count-1 do
   begin
      application.ProcessMessages;  //防止程序假死
      proc.Position:=i;
      statusbar1.SimpleText:=(edit1.Text+memo1.Lines.Strings[i]);
      if checkurl(edit1.Text+memo1.Lines.Strings[i]) then  //调用扫描程序开始扫描
         listbox1.items.Add(edit1.Text+memo1.Lines.Strings[i]);

      if i=memo1.lines.Count-1 then showmessage('扫描完毕！');
   end;
end;

procedure TForm1.FormCreate(Sender: TObject);
begin
  proc:=Tprogressbar.Create(self);   //创建一个进度条组件
  proc.Parent:=statusbar1;   
  proc.Left:=statusbar1.Panels[0].Width+10;
  proc.Top:=5;
  proc.Height:=25;
  proc.Width:=180; //一定要这句，否则PROC的长度为0，也就是不可见

  proc.Min:=0;
  proc.Max:=memo1.Lines.Count-1;
  proc.Position:=memo1.Lines.Count-1;
end;

procedure TForm1.Button1Click(Sender: TObject);
begin
   if opendialog1.Execute then
      memo1.Lines.LoadFromFile(opendialog1.filename); //载入文件
end;

end.