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Sorting a ListBox

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Join Date: May 2008
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coderoobie coderoobie is offline Offline
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Sorting a ListBox

 
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  #1
Aug 15th, 2008
Hi happy people

I've bin trying to sort items in a list box, the problem is obviously: It doesn't work

Please, any modifications to the code below is fully and unconditionally allowed.

C++ Syntax (Toggle Plain Text) 
  1. void __fastcall TForm1::btnSortClick(TObject *Sender)
  2. {
  3.  
  4.         //sort ascending
  5.        if (rdAscending->Checked){
  6.            bool swopped = true;
  7.            int iEnd;
  8.            int arr = lstWords->Count;
  9.            //ShowMessage(arr);
  10.            iEnd = arr -1;
  11.  
  12.            while (swopped)
  13.            {
  14.               swopped = false;
  15.               for (int c=0; c < iEnd; c++)
  16.               {
  17.                  AnsiString a = lstWords->Items->Strings[c];
  18.                  AnsiString b = lstWords->Items->Strings[c+1];
  19.                  if (a > b)
  20.                  {
  21.                     AnsiString txt = lstWords->Items->Strings[c];
  22.                     lstWords->Items->Strings[c] = lstWords->Items->Strings[c+1];
  23.                     lstWords->Items->Strings[c+1] = txt;
  24.                    swopped = true;
  25.                    iEnd--;
  26.  
  27.                 }
  28.  
  29.               }
  30.            }
  31.  
  32. 'Let us do what we do best!'
  33.        }
  34.        //sort descending
  35.        else if (rdDescending->Checked){
  36.            bool swopped = true;
  37.            int iEnd;
  38.            int arr = lstWords->Count;
  39.            iEnd = arr -1;
  40.  
  41.            while (swopped)
  42.            {
  43.               swopped = false;
  44.               for (int c=0; c < iEnd; c++)
  45.               {
  46.                  AnsiString a = lstWords->Items->Strings[c];
  47.                  AnsiString b = lstWords->Items->Strings[c+1];
  48.                  if (a < b)
  49.                  {
  50.                     AnsiString txt = lstWords->Items->Strings[c];
  51.                     lstWords->Items->Strings[c] = lstWords->Items->Strings[c+1];
  52.                     lstWords->Items->Strings[c+1] = txt;
  53.                    swopped = true;
  54.                    iEnd--;
  55.  
  56.                 }
  57.  
  58.               }
  59.            }
  60.        }
  61.        else
  62.         ShowMessage(
  63.         "Select either [Ascending] or [Descending]! \nPlease Try Again!"); 
  64. }
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Re: Sorting a ListBox

 
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  #2
Aug 15th, 2008
Can't you use qsort() for this? It'd make the code a lot shorter... and easier I guess.

And a, a bit more precise about the error? What are you getting? Segfaults or just a not-sorted listbox?
Last edited by Clockowl; Aug 15th, 2008 at 6:53 am.
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coderoobie coderoobie is offline Offline
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Re: Sorting a ListBox

 
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  #3
Aug 15th, 2008
I'l try using 'qsort()'. I never new there was such a function, but now because of you I..........! ;-)

About the error, it was not an error at all. It is wrong logic that I used, and I got it al fixed!

Thanks a lot clockowl!
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