这个答案的最重要的部分是“你需要了解HTML和JavaScript,并找出该网站是如何工作的。”打开网站,右键单击并执行“显示源”。你会发现顶端有这样的:
<script type="text/javascript">var currenttime = 'July 07, 2011 11:51:14'</script>
那样子的时候,在我的情况下,时间是正确的,但没有调整到我的时区。您可以使用Indy轻松获取纯HTML,显然这就够了。此快速代码示例向您展示了如何使用一小段RegEx获取HTML并解析日期和时间。如果您使用的是Delphi XE,则必须将TPerlRegEx
类名称和PerlRegEx
单元名称替换为任何XE所需的名称。如果您使用的是旧版Delphi,那么不能使用RegEx!下载TPerlRegEx,它是免费的,并与XE的东西兼容。
program Project29;
{$APPTYPE CONSOLE}
uses
SysUtils, IdHTTP, PerlRegEx, SysConst;
function ExtractDayTime: TDateTime;
var H: TIdHTTP;
Response: string;
RegEx: TPerlRegEx;
s: string;
Month, Year, Day, Hour, Minute, Second: Word;
begin
H := TIdHttp.Create(Nil);
try
Response := H.Get('http://presnycas.eu/');
RegEx := TPerlRegEx.Create;
try
RegEx.RegEx := 'var\ currenttime\ \=\ \''(\w+)\ (\d{1,2})\,\ (\d{4})\ (\d{1,2})\:(\d{1,2})\:(\d{1,2})\''';
RegEx.Subject := Response;
if RegEx.Match then
begin
// Translate month
s := RegEx.Groups[1];
if s = SShortMonthNameJan then Month := 1
else if s = SShortMonthNameFeb then Month := 2
else if s = SShortMonthNameMar then Month := 3
else if s = SShortMonthNameApr then Month := 4
else if s = SShortMonthNameMay then Month := 5
else if s = SShortMonthNameJun then Month := 6
else if s = SShortMonthNameJul then Month := 7
else if s = SShortMonthNameAug then Month := 8
else if s = SShortMonthNameSep then Month := 9
else if s = SShortMonthNameOct then Month := 10
else if s = SShortMonthNameNov then Month := 11
else if s = SShortMonthNameDec then Month := 12
else if s = SLongMonthNameJan then Month := 1
else if s = SLongMonthNameFeb then Month := 2
else if s = SLongMonthNameMar then Month := 3
else if s = SLongMonthNameApr then Month := 4
else if s = SLongMonthNameMay then Month := 5
else if s = SLongMonthNameJun then Month := 6
else if s = SLongMonthNameJul then Month := 7
else if s = SLongMonthNameAug then Month := 8
else if s = SLongMonthNameSep then Month := 9
else if s = SLongMonthNameOct then Month := 10
else if s = SLongMonthNameNov then Month := 11
else if s = SLongMonthNameDec then Month := 12
else
raise Exception.CreateFmt('Don''t know what month is: %s', [s]);
// Day, Year, Hour, Minute, Second
Day := StrToInt(RegEx.Groups[2]);
Year := StrToInt(RegEx.Groups[3]);
Hour := StrToInt(RegEx.Groups[4]);
Minute := StrToInt(RegEx.Groups[5]);
Second := StrToInt(RegEx.Groups[6]);
Result := EncodeDate(Year, Month, Day) + EncodeTime(Hour, Minute, Second, 0);
end
else
raise Exception.Create('Can''t get time!');
finally RegEx.Free;
end;
finally H.Free;
end;
end;
begin
WriteLn(DateTimeToStr(ExtractDayTime));
ReadLn;
end.
时间是使用JavaScript函数(displaytime),这是产生也用于显式修改servertime HTML元素。然后每秒钟调用这个函数。据我所知,你将无法阅读那个时间。 – LightBulb