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Steven
Guest
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 Posted: Fri Feb 17, 2006 7:03 pm Post subject: Parsing strings, sometimes hard |
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I am trying to parse this string on a webpage, I want to
retrieve the version number of some software. When
I parse, I am not getting the correct info. back. I really
don't want to be adding in "+1 or +3 etc" to the code.
Is there a more efficient way of scraping the information
when going through the stringlist() to get what I want?
// .h
#define START "var curversion = '"
#define END "';"
//info in stringlist
var curversion = '2.0.5.6316';
//aVal in debugger
/t/t/t/t/tvar curversion = '2.0.5.6316';
//code
AnsiString pVal = pList->Strings[i];
int cnt = sizeof(START); //cnt returns 19
aVal.Delete(1, cnt);
Pos = aVal.Pos(ZIPBACKUP_END);
if(Pos > 0)
aVal.Delete(Pos, aVal.Length());
// return result
= '2.0.5.6316
Somehow adding in the tabs to the string does not return a found
string: #define START "/t/t/t/t/tvar curversion = '2.0.5.6316';"
I could always do a +4 to remove the rest of the info, but, is there
a better way?
Appreciate it
Steven |
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Steven
Guest
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| Posted: Fri Feb 17, 2006 9:03 pm Post subject: Re: Parsing strings, sometimes hard |
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| Quote: | Have you taken a look at tools like boost::regex
or the pcre lib? They can be very useful in such
cases.
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Actually I didn't think about using any outside libs
for parsing, apart from what funcs that come with
bds2006. Plus, with something as simple as parsing
a few webpages, I don't think I will need anything
that complex.
Steven |
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Giuliano
Guest
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| Posted: Fri Feb 17, 2006 9:03 pm Post subject: Re: Parsing strings, sometimes hard |
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On Fri, 17 Feb 2006 14:15:18 -0600, "Steven" <stef (AT) bondo (DOT) edu> wrote:
| Quote: | a few webpages, I don't think I will need anything
that complex.
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IMHO, REs are simpler to use (and often faster), respect to write hand crafted
code.
Regards
Giuliano |
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Steven
Guest
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| Posted: Fri Feb 17, 2006 9:03 pm Post subject: Re: Parsing strings, sometimes hard |
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| Quote: | IMHO, REs are simpler to use (and often faster), respect to write hand
crafted
code.
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Where in the world do you find those libraries anyway? |
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Giuliano
Guest
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| Posted: Fri Feb 17, 2006 9:03 pm Post subject: Re: Parsing strings, sometimes hard |
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On Fri, 17 Feb 2006 12:08:35 -0600, "Steven" <stef (AT) bondo (DOT) edu> wrote:
[snip]
| Quote: | but, is there
a better way?
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Hi Steven,
generally speaking, in the most cases,
best results can be obtained using regular
expressions, at least - directly - for non
recursive structures. Parsing using RE engines,
can be pretty simple, fast and straightforward.
Have you taken a look at tools like boost::regex
or the pcre lib? They can be very useful in such
cases.
Regards
Giuliano |
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Hans Galema
Guest
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| Posted: Fri Feb 17, 2006 11:03 pm Post subject: Re: Parsing strings, sometimes hard |
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Steven wrote:
| Quote: | I am trying to parse this string on a webpage,
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Do you want to extract "2.0.5.6316" from a line "var curversion = '2.0.5.6316';" ?
AnsiString Line = " var curversion = '2.0.5.6316';";
#define START "var curversion = '"
#define END "';"
int pos1 = Line.Pos ( START );
int pos2 = Line.Pos ( END );
if ( pos1 && pos2 && pos2 > pos1 )
{
pos1 += strlen(START);
AnsiString Result = Line.SubString ( pos1, pos2 - pos1 );
ShowMessage ( Result );
}
Hans. |
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Chris Uzdavinis (TeamB)
Guest
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| Posted: Fri Feb 17, 2006 11:03 pm Post subject: Re: Parsing strings, sometimes hard |
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"Steven" <stef (AT) bondo (DOT) edu> writes:
| Quote: | IMHO, REs are simpler to use (and often faster), respect to write hand
crafted
code.
Where in the world do you find those libraries anyway?
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Check out boost. (www.boost.org)
--
Chris (TeamB); |
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Steven
Guest
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| Posted: Sat Feb 18, 2006 12:03 am Post subject: Re: Parsing strings, sometimes hard |
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Thanks Hans
"Hans Galema" <notused (AT) notused (DOT) nl> wrote in message
news:43f6526f$1 (AT) newsgroups (DOT) borland.com...
| Quote: | Steven wrote:
I am trying to parse this string on a webpage,
Do you want to extract "2.0.5.6316" from a line "var curversion =
'2.0.5.6316';" ?
AnsiString Line = " var curversion = '2.0.5.6316';"; |
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Steven
Guest
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| Posted: Sat Feb 18, 2006 12:03 am Post subject: Re: Parsing strings, sometimes hard |
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Thanks for the link Chris.
"Chris Uzdavinis (TeamB)" <chris (AT) uzdavinis (DOT) com> wrote in message
news:j5hd6xr6kj.fsf (AT) explicit (DOT) atdesk.com...
| Quote: | "Steven" <stef (AT) bondo (DOT) edu> writes:
Check out boost. (www.boost.org)
--
Chris (TeamB); |
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Giuliano
Guest
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| Posted: Sun Feb 19, 2006 12:03 pm Post subject: Re: Parsing strings, sometimes hard |
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On Fri, 17 Feb 2006 14:43:44 -0600, "Steven" <stef (AT) bondo (DOT) edu> wrote:
| Quote: | IMHO, REs are simpler to use (and often faster), respect to write hand
crafted
code.
Where in the world do you find those libraries anyway?
|
Hi,
other than boost (Chris gave you the link),
you can try to use PCRE which comes with BCB.
If you need a sample project for BCB6 let me
know: I will send to you a zip.
Ciao
Giuliano |
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