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   <TITLE>CListCtrl - Sort list (numeric/text) using callback</TITLE>
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<FONT COLOR="#AOAO99">Sort list (numeric/text) using callback</FONT></H3></CENTER>

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This article was contributed by <A HREF="mailto:warch@tin.it">Iuri Apollonio</A>.


<P>This is a small class which permits to sort list controls. It works "substituting" every original item data with a small class (preserving the value), sort it using the standard (fast!) list control way, and then putting the things right back.

<H4>Step 1: implementing the class</H4>
The class will contain two subclasses to manage numeric and text column data. The numeric is provided to avoid the sorting of 11 before 2 as it would occur with string comparison; there are also 4 comparing routines (for ascending and descending text and integer columns).

<P>The header file of the class should be like this:
<PRE><TT><FONT COLOR="#990000">
class CSortClass
{
public:
	CSortClass(CListCtrl * _pWnd, const int _iCol, const bool _bIsNumeric);
	virtual ~CSortClass();
	
	int iCol;
	CListCtrl * pWnd;
	bool bIsNumeric;
	void Sort(const bool bAsc);
	
	static int CALLBACK CompareAsc(LPARAM lParam1, LPARAM lParam2, LPARAM lParamSort);
	static int CALLBACK CompareDes(LPARAM lParam1, LPARAM lParam2, LPARAM lParamSort);
	
	static int CALLBACK CompareAscI(LPARAM lParam1, LPARAM lParam2, LPARAM lParamSort);
	static int CALLBACK CompareDesI(LPARAM lParam1, LPARAM lParam2, LPARAM lParamSort);
	
public:
	class CSortItem
	{
	public:
		virtual

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