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delphi 检测链接和获取链接内容

作者:admin 来源: 日期:2018/2/26 0:15:53 人气: 标签:

uses WinInet;

function CheckUrl(Url: string): boolean;
var
  hSession, hFile, hRequest: hInternet;
  dwIndex, dwCodeLen: dword;
  dwCode: array [1..20] of char;
  res: PChar;
begin
  Result:=false;
  hSession:=InternetOpen('Mozilla/4.0 (MSIE 6.0; Windows NT 5.1)', INTERNET_OPEN_TYPE_PRECONFIG, nil,nil,0);
  if Assigned(hSession) then begin
    if Copy(LowerCase(Url), 1, 8) = 'https://' then
      hFile:=InternetOpenURL(hSession, PChar(Url), nil, 0, INTERNET_FLAG_SECURE, 0)
    else
      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 HTTPGet(Url: string): string;
var
  hSession, hConnect, hRequest: hInternet;
  FHost, FScript, SRequest, Uri: string;
  Ansi: PAnsiChar;
  Buff: array [0..1023] of Char;
  BytesRead: Cardinal;
  Res, Len: DWORD;
  https: boolean;
const
  Header='Content-Type: application/x-www-form-urlencoded' + #13#10;
begin
  https:=false;
  if Copy(LowerCase(Url),1,8) = 'https://' then https:=true;
  Result:='';

  if Copy(LowerCase(Url), 1, 7) = 'http://' then Delete(Url, 1, 7);
  if Copy(LowerCase(Url), 1, 8) = 'https://' then Delete(Url, 1, 8);

  Uri:=Url;
  Uri:=Copy(Uri, 1, Pos('/', Uri) - 1);
  FHost:=Uri;
  FScript:=Url;
  Delete(FScript, 1, Pos(FHost, FScript) + Length(FHost));

  hSession:=InternetOpen('Mozilla/4.0 (MSIE 6.0; Windows NT 5.1)', INTERNET_OPEN_TYPE_PRECONFIG, nil, nil, 0);
  if not Assigned(hSession) then exit;
  try
    if https then hConnect:=InternetConnect(hSession, PChar(FHost), INTERNET_DEFAULT_HTTPS_PORT, nil,'HTTP/1.0', INTERNET_SERVICE_HTTP, 0, 0) else
      hConnect:=InternetConnect(hSession, PChar(FHost), INTERNET_DEFAULT_HTTP_PORT, nil, 'HTTP/1.0', INTERNET_SERVICE_HTTP, 0, 0);
    if not Assigned(hConnect) then exit;
    try
      Ansi:='text/*';
      if https then
        hRequest:=HttpOpenRequest(hConnect, 'GET', PChar(FScript), 'HTTP/1.1', nil, @Ansi, INTERNET_FLAG_SECURE, 0)
      else
        hRequest:=HttpOpenRequest(hConnect, 'GET', PChar(FScript), 'HTTP/1.1', nil, @Ansi, INTERNET_FLAG_RELOAD, 0);
      if not Assigned(hConnect) then Exit;
        try
          if not (HttpAddRequestHeaders(hRequest, Header, Length(Header), HTTP_ADDREQ_FLAG_REPLACE or HTTP_ADDREQ_FLAG_ADD or HTTP_ADDREQ_FLAG_COALESCE_WITH_COMMA)) then
            exit;
          Len:=0;
          Res:=0;
          SRequest:=' ';
          HttpQueryInfo(hRequest, HTTP_QUERY_RAW_HEADERS_CRLF or HTTP_QUERY_FLAG_REQUEST_HEADERS, @SRequest[1], Len, Res);
          if Len > 0 then begin
            SetLength(SRequest, Len);
            HttpQueryInfo(hRequest, HTTP_QUERY_RAW_HEADERS_CRLF or HTTP_QUERY_FLAG_REQUEST_HEADERS, @SRequest[1], Len, Res);
          end;
          if not (HttpSendRequest(hRequest, nil, 0, nil, 0)) then // www.delphitop.com
            exit;
          FillChar(Buff, SizeOf(Buff), 0);
          repeat
            Application.ProcessMessages;
            Result:=Result + Buff;
            FillChar(Buff, SizeOf(Buff), 0);
            InternetReadFile(hRequest, @Buff, SizeOf(Buff), BytesRead);
          until BytesRead = 0;
        finally
          InternetCloseHandle(hRequest);
        end;
    finally
      InternetCloseHandle(hConnect);
    end;
  finally
    InternetCloseHandle(hSession);
  end;
end;

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