判断网络的路径是否有效(100)

我想判断一个url的内容是否有效如 http://www.baidu.com/aa.ico，http://www.baidu.com/favicon.ico用ulrdowntofile 有时候反应比较慢。请大家指教

HTTP的话用这些API函数,文件不全下载就行了InternetOpenInternetConnectHttpOpenRequestHttpSendRequestHttpQueryInfo

InternetOpen就可以吧。

这个好像也不快[]

function CheckUrl(url: string; TimeOut: Integer = 5000): boolean; var hSession, hfile : 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 := nil; hFile := nil; //设置超时 InternetSetOption(hSession, Internet_OPTION_CONNECT_TIMEOUT, @TimeOut, 4); hSession := InternetOpen('Mozilla/4.0', INTERNET_OPEN_TYPE_PRECONFIG, nil, nil, 0); 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; else result := true; end; if assigned(hfile) then InternetCloseHandle(hfile); InternetCloseHandle(hsession); end; end;

这个一定行.