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uses wininet;
procedure TForm1.FormCreate(Sender: TObject);
var
localFile: string;
cacheInfo: PInternetCacheEntryInfoA;
bufsize: Cardinal;
begin
bufsize := 65535;
cacheInfo := nil;
GetUrlCacheEntryInfo('http://survey.finance.sina.com.cn/auth_number.php?survey=73c56125324495894371405412a4&t=1253245019265', cacheinfo^, bufsize);
GetMem(cacheInfo, bufsize);
if (GetUrlCacheEntryInfo(PChar('http://survey.finance.sina.com.cn/auth_number.php?survey=73c56125324495894371405412a4&t=1253245019265'), cacheInfo^, bufsize)) then
showmessage(cacheinfo^.lpszLocalFileName)
else
begin
ShowMessage('没有缓存.');
end;
end;