BorlandTalk.com Borland discussion newsgroups   Archives   FAQ   Search   Memberlist   Usergroups   Register   Profile   Log in to check your private messages   Log in  backwards text search          BorlandTalk.com Forum Index -> comp.lang.pascal.delphi.misc View previous topic :: View next topic   Author Message Humphrey Guest Posted: Sat Nov 29, 2003 10:47 pm    Post subject: backwards text search can anyone help in a method for finding previous instances of a text string (eg a word). We are using this code to find strings going forward through a text file in a richedit box but how can you go backwards? Thanks for any suggestions. procedure TfrmFind.ImageArrowRClick(Sender: TObject); var StartPosLI, ToEndLI,LineindexLI : Integer; begin frmLibrary.RichEdit.SetFocus; with frmLibrary.RichEdit do begin if SelLength <> 0 then StartPosLI := SelStart + SelLength else StartPosLI := 0; ToEndLI := Length(Text) - StartPosLI; FoundAtLI := FindText(edtFindText.Text, StartPosLI, ToEndLI,[]); if FoundAtLI <> -1 then begin SetFocus; SelStart := FoundAtLI; SelLength := Length(edtFindText.Text); frmLibrary.RichEdit.Perform(EM_SCROLLCARET, 0, 0); end; end; Back to top Maarten Wiltink Guest Posted: Sat Nov 29, 2003 11:45 pm    Post subject: Re: backwards text search "Humphrey" <j.humphrey (AT) xtra (DOT) co.nz> wrote Quote: can anyone help in a method for finding previous instances of a text string (eg a word). We are using this code to find strings going forward through a text file in a richedit box but how can you go backwards? Thanks for any suggestions. <snip code> That code doesn't appear to find strings at all judging from what my help file says about FindText. It may not be the same FindText, though. My help file seems to list quite different parameters. Apart from that, how hard have you *tried* to do this? Neither the question itself nor the code fragment inspire much confidence in that. Groetjes, Maarten Wiltink Back to top Humphrey Guest Posted: Sun Nov 30, 2003 7:42 am    Post subject: Re: backwards text search "Maarten Wiltink" <maarten (AT) kittensandcats (DOT) net> wrote Quote: "Humphrey" <j.humphrey (AT) xtra (DOT) co.nz> wrote in message news:a1462659.0311291447.69a1a79b (AT) posting (DOT) google.com... can anyone help in a method for finding previous instances of a text string (eg a word). We are using this code to find strings going forward through a text file in a richedit box but how can you go backwards? Thanks for any suggestions. snip code That code doesn't appear to find strings at all judging from what my help file says about FindText. It may not be the same FindText, though. My help file seems to list quite different parameters. Apart from that, how hard have you *tried* to do this? Neither the question itself nor the code fragment inspire much confidence in that. Groetjes, Maarten Wiltink Hi Maarten the code works ok in a little E-book reader that I have designed for my studies but our tutor commented that he felt the 'findtext' only worked forward through a text, not backward. I am still learning the art of Delphi and have tried to prove him wrong but no success so was only looking for some suggestion on another avenue to take. Have you any? Back to top Maarten Wiltink Guest Posted: Sun Nov 30, 2003 2:56 pm    Post subject: Re: backwards text search "Humphrey" <j.humphrey (AT) xtra (DOT) co.nz> wrote Quote: the code works ok in a little E-book reader that I have designed for my studies but our tutor commented that he felt the 'findtext' only worked forward through a text, not backward. I am still learning the art of Delphi and have tried to prove him wrong but no success so was only looking for some suggestion on another avenue to take. Have you any? Your FindText, which as I've commented appears to be a different one from the one my help file explains, takes four parameters. Investigate these parameters. This tutor, exactly what is he tutoring you with? Developing said e-book reader, by any chance? In cases of suspected homework, I get rather less forthcoming with concrete advice. Groetjes, Maarten Wiltink Back to top Nicolai Hansen Guest Posted: Wed Dec 03, 2003 7:55 am    Post subject: Re: backwards text search Quote: This tutor, exactly what is he tutoring you with? Developing said e-book reader, by any chance? In cases of suspected homework, I get rather less forthcoming with concrete advice. Groetjes, Maarten Wiltink Hmm.. Maarten.. if you don't wanna do my homework, can I convince you to do my job instead? :) Back to top J French Guest Posted: Wed Dec 03, 2003 10:45 am    Post subject: Re: backwards text search On 29 Nov 2003 14:47:07 -0800, [email]j.humphrey (AT) xtra (DOT) co.nz[/email] (Humphrey) wrote: Quote: can anyone help in a method for finding previous instances of a text string (eg a word). We are using this code to find strings going forward through a text file in a richedit box but how can you go backwards? Thanks for any suggestions. You just decrement the StartPos in the FindText method ( and increment the length ) Personally I would develop a strategy of decrementing it in blocks and repeatedly using RE.FindText .. until I found the last before the real 'startpos' Incidentally, that is probably what your tutor is trying to get you to work out for yourself - how to develop a 'search strategy' Back to top Maarten Wiltink Guest Posted: Wed Dec 03, 2003 2:21 pm    Post subject: Re: backwards text search "Nicolai Hansen" <nic (AT) aub (DOT) dk> wrote Quote: This tutor, exactly what is he tutoring you with? Developing said e-book reader, by any chance? In cases of suspected homework, I get rather less forthcoming with concrete advice. Groetjes, Maarten Wiltink Hmm.. Maarten.. if you don't wanna do my homework, can I convince you to do my job instead? Yes. Always. Erm... Can I see your paycheck? Never mind, can I _have_ your paycheck? Seriously, I don't mind helping people but I would like them to learn the general case from it, not just the one trick. I'm just funny that way. I know it's driving my dad batty; he's learned not to ask me some things. I hate that, because I _want_ to help him, but I just can't restrict myself to what he asks. People tend to have the same job next month, but different classes. This translates to quite different priorities. With the same job next month, you want to not have the same problem next month. With different classes, you know you're not going to have the same problem. 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