Solved

Base256 to int

Posted on 2006-10-24
8
608 Views
Last Modified: 2008-02-01
Does anybody know how to convert a string (base 256 number) to integer?
0
Comment
Question by:TiborKi
  • 3
  • 2
8 Comments
 
LVL 28

Accepted Solution

by:
2266180 earned 125 total points
ID: 17796908
0
 
LVL 45

Expert Comment

by:aikimark
ID: 17798414
How big is the string?
The ciuly link is probably the easiest solution.
0
 
LVL 1

Author Comment

by:TiborKi
ID: 17798517
the string is 4 bytes
0
Independent Software Vendors: We Want Your Opinion

We value your feedback.

Take our survey and automatically be enter to win anyone of the following:
Yeti Cooler, Amazon eGift Card, and Movie eGift Card!

 
LVL 45

Expert Comment

by:aikimark
ID: 17798626
The only problem you are likely to encounter is signed versus unsigned integer values.  If the high-order bit of the high-order byte = 1 then a signed integer will be negative.

Is this a performance critical function or do you simply need to know how it can be done?
0
 
LVL 1

Author Comment

by:TiborKi
ID: 17798790
well, it must be fast...
0
 
LVL 45

Assisted Solution

by:aikimark
aikimark earned 125 total points
ID: 17798999
"fast" is relative.  The best course of action will be to try the ciuly linked solution and determine if it suits your needs as far as functionality and speed.  If it doesn't, then ask us for more help.

===================================
For future readers, there are several approaches available to do this conversion.
* character->ord add and shiftLeft 8 (three statement pairs followed by simple add)
* similar to above, but using For iteration construct
* Delphi Copy function or API call to copy bytes directly into integer variable.  May require additional ntohl API call to reverse the byte order to accomodate Little-endian Windows environment.  This solution can get really tricky, depending on the nature of the 'string variable'.  Due to complexity, this should be solution approach of last resort.
* ASM solution (see the FastCode project)
0

Featured Post

Secure Your Active Directory - April 20, 2017

Active Directory plays a critical role in your company’s IT infrastructure and keeping it secure in today’s hacker-infested world is a must.
Microsoft published 300+ pages of guidance, but who has the time, money, and resources to implement? Register now to find an easier way.

Question has a verified solution.

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

Suggested Solutions

Objective: - This article will help user in how to convert their numeric value become words. How to use 1. You can copy this code in your Unit as function 2. than you can perform your function by type this code The Code   (CODE) The Im…
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…
Finds all prime numbers in a range requested and places them in a public primes() array. I've demostrated a template size of 30 (2 * 3 * 5) but larger templates can be built such 210  (2 * 3 * 5 * 7) or 2310  (2 * 3 * 5 * 7 * 11). The larger templa…
In a recent question (https://www.experts-exchange.com/questions/29004105/Run-AutoHotkey-script-directly-from-Notepad.html) here at Experts Exchange, a member asked how to run an AutoHotkey script (.AHK) directly from Notepad++ (aka NPP). This video…

740 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