Solved

New to Delphi, need some help...

Posted on 1998-10-25
10
139 Views
Last Modified: 2010-08-05
Hi, I'm a VB programmer that is switching to Delphi and theres a few things I need some help with.  

1. In VB I used to use Left,Mid, & Right.  I couldn't find anything like that in Delphi... maybe I missed it, I don't know.  Is there anything like that in Delphi?

2. I used to use instr in VB to locate text in a string, it worked great because I could tell it where to start.  The closest thing I found in Delphi is the Pos... is there anything in Delphi thats like instr?

ohh yeah, and one last question... using a listbox how can I get the total items in it?

Thanks for the help.
0
Comment
Question by:dokken
10 Comments
 
LVL 4

Expert Comment

by:dwwang
ID: 1344262
I would like to say Delphi is a "REAL" low level programming language so there are not somany build-in functions as VB has.

You can either write some by yourself or lookup on the internet.
0
 
LVL 3

Expert Comment

by:bryan7
ID: 1344263
1: Do you mean Left$ Mid$ and Right$ ?
2: What's "Pos" for ?

maybe I could write some functions that do the same.

bryan
0
 
LVL 3

Accepted Solution

by:
bryan7 earned 60 total points
ID: 1344264
try this:

function Mid(Finalstring,Initialstring: string; InitialPos,NumberOfCharacters: Integer): string;
Var a: Integer;
begin
FinalString:= '';
for a:= InitialPos to (InitialPos + NumberOfCharacters -1 ) do
      FinalString:= FinalString + Initialstring[a];
end;

function Left(Finalstring,Initialstring: string; NumberOfCharacters: Integer): string;
Var a: Integer;
begin
FinalString:= '';
for a:= 1 to NumberOfCharacters do
      FinalString:= FinalString + Initialstring[a];
end;

function Right(Finalstring,Initialstring: string; NumberOfCharacters: Integer): string;
Var a: Integer;
begin
FinalString:= '';
for a:= Length(InitialString) downto (Length(InitialString) - NumberOfCharacters +1) do
      FinalString:= FinalString + Initialstring[a];
end;

bryan
           
0
3 Use Cases for Connected Systems

Our Dev teams are like yours. They’re continually cranking out code for new features/bugs fixes, testing, deploying, testing some more, responding to production monitoring events and more. It’s complex. So, we thought you’d like to see what’s working for us.

 
LVL 17

Expert Comment

by:inthe
ID: 1344265
Hello Dokken

pos returns the index value of the first character in a specified substring that occurs in a givin string.  

and  for the listbox items it's :
edit1.text:= inttostr(listbox1.items.count);

¤¤¤¤¤¤¤ InThe ¤¤¤¤¤¤¤
0
 
LVL 3

Expert Comment

by:bryan7
ID: 1344266
And to locate text in a string:

function LocateText(TotalText,TextToFind: string, PosFrom,PosFound: Integer): Integer;
Var a,b: Integer;
      c: string;
begin
c:= '';
For  a:=  PosFrom to length(TotalText) do
    begin
          c:='';
          for b:= a to (a+length(TextToFind)-1) do
               c:= c+TotalText[b];
          if c= TextToFind then
                begin
                       PosFound:= a;
                       Exit;
                end;
    end;
PosFound:= 0;
end;

If it returns 0, then the text wasn't found.
I've not tested it with Delphi, but it should work, as Delphi is somehow like Pascal.

I'll test it later and fix any bugs if there are..

bryan


0
 

Author Comment

by:dokken
ID: 1344267
Thanks for the help, you guys answered my questions perfectly!
0
 
LVL 3

Expert Comment

by:bryan7
ID: 1344268
hey dokken,

Soon I'll start with VB5, then we could exchange some knowledges about
 Delphi - VB5, what do you think ?

Give me your email, if you want so.

bryan
0
 

Author Comment

by:dokken
ID: 1344269
bryan7,

That would be cool, whats your email address?

dokken
0
 
LVL 3

Expert Comment

by:bryan7
ID: 1344270
AerithFantasy@earthling.net

AERISFANTASY@EARTHLING.NET

send a checking email.

bryan =)

0
 
LVL 3

Expert Comment

by:bryan7
ID: 1344271
sorry,  I mean,

AERITHFANTASY@EARTHLING.NET

bryan

0

Featured Post

Best Practices: Disaster Recovery Testing

Besides backup, any IT division should have a disaster recovery plan. You will find a few tips below relating to the development of such a plan and to what issues one should pay special attention in the course of backup planning.

Question has a verified solution.

If you are experiencing a similar issue, please ask a related question

Suggested Solutions

Hello everybody This Article will show you how to validate number with TEdit control, What's the TEdit control? TEdit is a standard Windows edit control on a form, it allows to user to write, read and copy/paste single line of text. Usua…
Introduction Raise your hands if you were as upset with FireMonkey as I was when I discovered that there was no TListview.  I use TListView in almost all of my applications I've written, and I was not going to compromise by resorting to TStringGrid…
Two types of users will appreciate AOMEI Backupper Pro: 1 - Those with PCIe drives (and haven't found cloning software that works on them). 2 - Those who want a fast clone of their boot drive (no re-boots needed) and it can clone your drive wh…
This video shows how to use Hyena, from SystemTools Software, to bulk import 100 user accounts from an external text file. View in 1080p for best video quality.

821 members asked questions and received personalized solutions in the past 7 days.

Join the community of 500,000 technology professionals and ask your questions.

Join & Ask a Question