[函数]function CheckUrl(url: string): Boolean; //检查一个URL是否有效函数

源代码网整理以下//检查一个URL是否有效函数

源代码网整理以下//可用来检测网络连接是否正确，InternetCheckConnection函数检查不准确，有些情况无法检测到，而以下CheckUrl函数则不会。
//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;
if Pos("http://", LowerCase(url)) = 0 then url := "http://" url;
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"); //200,302未重定位标志
if Assigned(hfile) then
InternetCloseHandle(hfile);
InternetCloseHandle(hsession);
end;
end;