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Introduces RSS Reader by AgileInfoSoftware

, 2 Dec 2003
This article introduces an application to consume RSS Feed from Internet.
// ListCtrlSortClass.cpp: implementation of the CListCtrlSortClass class.

#include "stdafx.h"
#include "ListCtrlSortClass.h"
#include "NTHelper.h"

#ifdef _DEBUG
#undef THIS_FILE
static char THIS_FILE[]=__FILE__;
#define new DEBUG_NEW

// Construction/Destruction

CListCtrlSortClass::CListCtrlSortClass(CListCtrl *pList, const int nCol)
	m_pList = pList;
	int totItems = m_pList->GetItemCount();

	// Replace All Item Data with pointer to CSortItem class
	for (int i = 0; i < totItems; i++)
		DWORD dw = m_pList->GetItemData(i);
		CString txt = m_pList->GetItemText(i, nCol);
		m_pList->SetItemData(i, (DWORD) new CSortItem(dw, txt));

	// Reset Data value for All item and delete CSortItem pointer
	int totItems = m_pList->GetItemCount();
	for (int i = 0; i < totItems; i++)
		CSortItem *pItem = (CSortItem*)(m_pList->GetItemData(i));
		m_pList->SetItemData(i, pItem->m_dw);
		delete pItem;

void CListCtrlSortClass::Sort(BOOL bAsc, SortDataType dtType)
	// Prepare lParamSort: value == dtType, 
	//         with sign positive for ascending sort order, negative - descending
	long lParamSort = bAsc ? dtType : -dtType;
	m_pList->SortItems(Compare, lParamSort);

int CALLBACK CListCtrlSortClass::Compare(LPARAM lParam1, LPARAM lParam2, LPARAM lParamSort)
	CSortItem *pItem1 = (CSortItem*)lParam1;
	CSortItem *pItem2 = (CSortItem*)lParam2;
	ASSERT(pItem1 && pItem2);

	int nOrder = (lParamSort < 0) ? -1 : 1;
	SortDataType dtType = (SortDataType) (lParamSort * nOrder); // get rid of sign

	switch (dtType)
	case SortDataType::dtINT:
		return ( _ttol(pItem1->m_txt) - _ttol(pItem2->m_txt)) * nOrder;
	case SortDataType::dtDEC:
		return (int) ((CNTHelper::_ttof(pItem1->m_txt) - CNTHelper::_ttof(pItem2->m_txt)) * nOrder);
	case SortDataType::dtSTRING:
		return pItem1->m_txt.Compare(pItem2->m_txt) * nOrder;
	case SortDataType::dtSTRINGNOCASE:
		return pItem1->m_txt.CompareNoCase(pItem2->m_txt) * nOrder;
	case SortDataType::dtDATETIME:
			COleDateTime time1, time2;
			if (time1.ParseDateTime(pItem1->m_txt) && time2.ParseDateTime(pItem2->m_txt))
				return ((time1 == time2) ? 0 : (time1 < time2 ? -1 : 1)) * nOrder;
		ASSERT("Error: attempt to sort a column without type.");
		return 0;

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About the Author
Web Developer
United States United States
LI is a architect of several database-centric tools and technologies. He has been programming since 1995. He is a Microsoft Certified Solution Developer (MCSD), MCSD.NET, SCJP, SCJD and OCDBA.

His programming experience includes C/C++, C#, MFC, ASP, VB and Perl. He has worked on Solaris, AIX, HPUX and various Windows, and found Windows is the easiest one to work with.

He has over 8 years of database experiences in Oracle, SQL Server, DB2 and other DBMS.

LI co-founded AgileInfoSoftware LLC ( in 2003. He is responsible for the overall vision and development strategy of the company.

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