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VC++ Sample: Quick Sort for CStringArray

 
Chris Losinger.

Environment: Tested on VC++ 6.0

These three routines can be used to perform a qsort on a CStringArray.  It is a fairly simple hack, but still a hack.  It sure is fast, though.

// first, declare these somewhere
void SortStringArray (CStringArray& ar, BOOL bDescending);
int CompareDescending(const void *a, const void *b);
int CompareAscending(const void *a, const void *b);

// put something in your CString array
  CStringArray bob;
  bob.Add("Are");
  bob.Add("You");
  bob.Add("Talking");
  bob.Add("To");
  bob.Add("Me?");

// sort it
  SortStringArray(bob, TRUE);

// here's the code!

//////////////////////////////////////////////////////////////////////////
int CompareAscending(const void *a, const void *b)
{
  CString *pA = (CString*)a;
  CString *pB = (CString*)b;
  return (pA->Compare(*pB));
}

//////////////////////////////////////////////////////////////////////////
int CompareDescending(const void *a, const void *b)
{
  CString *pA = (CString*)a;
  CString *pB = (CString*)b;
  return (-1 * (pA->Compare(*pB)));
}

//////////////////////////////////////////////////////////////////////////
void SortStringArray (CStringArray& csa, BOOL bDescending)
{
  int iArraySize = csa.GetSize();
  if (iArraySize <= 0)
     return;

  int iCSSize = sizeof (CString*);
  void* pArrayStart = (void *)&csa[0];

  if (bDescending)
     qsort (pArrayStart, iArraySize, iCSSize, CompareDescending);
  else
     qsort (pArrayStart, iArraySize, iCSSize, CompareAscending);
}

 

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