Solved

STRTOHEX

Posted on 2006-06-22
3
4,370 Views
Last Modified: 2008-01-09
Yo guys im stuck here

I need to convert a text to hex - not a big deal if you use inttohex(strtoint(text),2);

Now the problem:

how do I convert a text like :

my_text := 1234567890123;
showmessage(inttohex(strtoint(my_text),2)); // this will raise an exception in strtoint(my_text) since the number is higher then 2147483647

Question: Is there a way to convert a string with up to 10 digits into hexadecimal ? how to do it ?



thx in adv
0
Comment
Question by:furmiga
[X]
Welcome to Experts Exchange

Add your voice to the tech community where 5M+ people just like you are talking about what matters.

  • Help others & share knowledge
  • Earn cash & points
  • Learn & ask questions
  • 2
3 Comments
 
LVL 17

Accepted Solution

by:
TheRealLoki earned 500 total points
ID: 16965106
I think I've got this right :-)
try it out

procedure TForm1.Button1Click(Sender: TObject);
    var
        my_text: string;
    begin
        my_text := '1234567890123';
        showmessage(Int64ToHex(StrToInt64(my_text)));
    end;

procedure Int64ToHex(bigi: int64): string;
    var
        lo1: integer;
    begin
        result := '';
        while bigi > 0 do
        begin
            lo1 := lo(bigi);
            result := IntToHex(lo1, 2) + result;
            bigi := bigi shr 8;
        end;
        result := '$' + result;
    end;
0
 
LVL 17

Expert Comment

by:TheRealLoki
ID: 16965124
what i'm doing is using an int64 (because it can store larger numbers) and then working out the hex for 1 byte at a time
"lo( )" gets the bottom byte, and "shr 8" moves my "big number" to the right 1 byte (8 bits), effectively dropping off the last byte I just grabbed
I append the hex values, and stick a $ at the start
0
 
LVL 28

Expert Comment

by:2266180
ID: 16965295
here is an alternative I've just spent some time on implementing that takes an integer string as uinput no matter how many digits:

procedure bigdiv16(int:string; var d,m:string);
var n,i,k:integer;
begin
  i:=1;
  repeat
    n:=strtoint(copy(int,1,i));
    inc(i);
  until (n div 16>0) or (i>length(int));
  if i>length(int) then
  begin
    d:='0';
    m:=int;//=inttostr(n);
    exit;
  end;
  d:='';
  k:=1;
  repeat
    n:=strtoint(copy(int,1,i-1+k-1));
    if n div 16 > 9 then
    begin
      dec(i);
      continue;
    end;
    d:=d+chr((n div 16)+48);
    if (n<16) and (length(int)>i-1+k-1) then
    begin
      inc(i);
      continue;
    end;
    delete(int,1,i-1+k-1);
    int:=inttostr(n mod 16)+int;
    k:=length(inttostr(n mod 16));
  until length(int)=k;
  m:=int;
end;

function strtohex(int:string):string;
var d,m:string;
begin
  d:=int;
  result:='';
  repeat
    bigdiv16(d,d,m);
    result:=inttohex(strtoint(m),1)+result;
  until d='0';
end;


my initial algorithm was much simpler, but there were some bugs. and that is why I put in thos nasty inc/decs. it's 4:30 am here. I should go to sleep cause I make ugly code :D

peace
0

Featured Post

Free Tool: SSL Checker

Scans your site and returns information about your SSL implementation and certificate. Helpful for debugging and validating your SSL configuration.

One of a set of tools we are providing to everyone as a way of saying thank you for being a part of the community.

Question has a verified solution.

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

Introduction I have seen many questions in this Delphi topic area where queries in threads are needed or suggested. I know bumped into a similar need. This article will address some of the concepts when dealing with a multithreaded delphi database…
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…
In this video we outline the Physical Segments view of NetCrunch network monitor. By following this brief how-to video, you will be able to learn how NetCrunch visualizes your network, how granular is the information collected, as well as where to f…
Sometimes it takes a new vantage point, apart from our everyday security practices, to truly see our Active Directory (AD) vulnerabilities. We get used to implementing the same techniques and checking the same areas for a breach. This pattern can re…
Suggested Courses
Course of the Month6 days, 6 hours left to enroll

626 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