win平台下, 检测网络是否连接最好的办法 [Delphi]检查URL是否有效的函数
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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;
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http://www.cnblogs.com/chonghai/p/5581402.html
http://bbs.2ccc.com/topic.asp?topicid=514550
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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;
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