unit Unit1;
interface
uses
Winapi.Windows, Winapi.Messages, System.SysUtils, System.Variants, System.Classes, Vcl.Graphics,
Vcl.Controls, Vcl.Forms, Vcl.Dialogs, Vcl.StdCtrls;
type
TForm1 = class(TForm)
Button1: TButton;
Edit1: TEdit;
Label1: TLabel;
procedure Button1Click(Sender: TObject);
private
{ Private declarations }
public
{ Public declarations }
end;
var
Form1: TForm1;
implementation
uses Wininet;
{$R *.dfm}
Function CheckUrl(url: string): Boolean;
var
hSession, hfile, hRequest: hInternet;
dwindex, dwcodelen: dword;
dwcode: array [1 .. 20] of char;
res: PChar;
begin
if pos('http://', lowercase(url)) = 0 then
url := 'http://' + url;
Result := False;
hSession := InternetOpen('InetURL:/1.0', INTERNET_OPEN_TYPE_PRECONFIG, nil, nil, 0);
if assigned(hSession) then
begin
hfile := InternetOpenUrl(hSession, PChar(url), nil, 0, INTERNET_FLAG_RELOAD, 0);
dwindex := 0;
dwcodelen := 10;
HttpQueryInfo(hfile, HTTP_QUERY_STATUS_CODE, @dwcode, dwcodelen, dwindex);
res := PChar(@dwcode);
Result := (res = '200') or (res = '302');
if assigned(hfile) then
InternetCloseHandle(hfile);
InternetCloseHandle(hSession);
end;
end;
function CheckUrl1(url: string; TimeOut: integer = 3): 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;
hSession := InternetOpen('Mozilla/4.0', INTERNET_OPEN_TYPE_PRECONFIG, nil, nil, 0);
InternetSetOption(hSession, Internet_OPTION_CONNECT_TIMEOUT, @TimeOut, 4);
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(2000);
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
200 .. 299:
Result := true;
401 .. 403:
Result := true;
else
Result := False;
end;
if assigned(hfile) then
InternetCloseHandle(hfile);
InternetCloseHandle(hSession);
end;
end;
procedure pro;
begin
Form1.Caption:='检测URL中....';
if CheckUrl1(Form1.Edit1.Text,1) then
Form1.Caption:='URL能连接....'
else
Form1.Caption:='URL无效....';
end;
procedure TForm1.Button1Click(Sender: TObject);
begin
TThread.CreateAnonymousThread(pro).Start;
end;
end.
