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How To Serialize a CTreeCtrl in XML

, 3 May 2006 CPOL
Extend derived CTreeCtrl classes with an easy and fast to use approach for XML serialisation.
// CTreeCtrlXMLDlg.cpp : implementation file
//

#include "stdafx.h"
#include "CTreeCtrlXML.h"
#include "CTreeCtrlXMLDlg.h"
#include ".\ctreectrlxmldlg.h"

#ifdef _DEBUG
#define new DEBUG_NEW
#endif


// CAboutDlg dialog used for App About

class CAboutDlg : public CDialog
{
public:
	CAboutDlg();

// Dialog Data
	enum { IDD = IDD_ABOUTBOX };

	protected:
	virtual void DoDataExchange(CDataExchange* pDX);    // DDX/DDV support

// Implementation
protected:
	DECLARE_MESSAGE_MAP()
};

CAboutDlg::CAboutDlg() : CDialog(CAboutDlg::IDD)
{
}

void CAboutDlg::DoDataExchange(CDataExchange* pDX)
{
	CDialog::DoDataExchange(pDX);
}

BEGIN_MESSAGE_MAP(CAboutDlg, CDialog)
END_MESSAGE_MAP()


// CCTreeCtrlXMLDlg dialog



CCTreeCtrlXMLDlg::CCTreeCtrlXMLDlg(CWnd* pParent /*=NULL*/)
	: CDialog(CCTreeCtrlXMLDlg::IDD, pParent)
{
	m_hIcon = AfxGetApp()->LoadIcon(IDR_MAINFRAME);
}

void CCTreeCtrlXMLDlg::DoDataExchange(CDataExchange* pDX)
{
	CDialog::DoDataExchange(pDX);
	DDX_Control(pDX, IDC_TREE1, m_demoTree);
}

BEGIN_MESSAGE_MAP(CCTreeCtrlXMLDlg, CDialog)
	ON_WM_SYSCOMMAND()
	ON_WM_PAINT()
	ON_WM_QUERYDRAGICON()
	//}}AFX_MSG_MAP
	ON_BN_CLICKED(IDC_BUTTON_LOAD, OnBnClickedButtonLoad)
	ON_BN_CLICKED(IDC_BUTTON_SAVE, OnBnClickedButtonSave)
END_MESSAGE_MAP()


// CCTreeCtrlXMLDlg message handlers

BOOL CCTreeCtrlXMLDlg::OnInitDialog()
{
	CDialog::OnInitDialog();

	// Add "About..." menu item to system menu.

	// IDM_ABOUTBOX must be in the system command range.
	ASSERT((IDM_ABOUTBOX & 0xFFF0) == IDM_ABOUTBOX);
	ASSERT(IDM_ABOUTBOX < 0xF000);

	CMenu* pSysMenu = GetSystemMenu(FALSE);
	if (pSysMenu != NULL)
	{
		CString strAboutMenu;
		strAboutMenu.LoadString(IDS_ABOUTBOX);
		if (!strAboutMenu.IsEmpty())
		{
			pSysMenu->AppendMenu(MF_SEPARATOR);
			pSysMenu->AppendMenu(MF_STRING, IDM_ABOUTBOX, strAboutMenu);
		}
	}

	// Set the icon for this dialog.  The framework does this automatically
	//  when the application's main window is not a dialog
	SetIcon(m_hIcon, TRUE);			// Set big icon
	SetIcon(m_hIcon, FALSE);		// Set small icon

	// TODO: Add extra initialization here
	
	// Load the data when the dialog starts
	OnBnClickedButtonLoad();

	return TRUE;  // return TRUE  unless you set the focus to a control
}

void CCTreeCtrlXMLDlg::OnSysCommand(UINT nID, LPARAM lParam)
{
	if ((nID & 0xFFF0) == IDM_ABOUTBOX)
	{
		CAboutDlg dlgAbout;
		dlgAbout.DoModal();
	}
	else
	{
		CDialog::OnSysCommand(nID, lParam);
	}
}

// If you add a minimize button to your dialog, you will need the code below
//  to draw the icon.  For MFC applications using the document/view model,
//  this is automatically done for you by the framework.

void CCTreeCtrlXMLDlg::OnPaint() 
{
	if (IsIconic())
	{
		CPaintDC dc(this); // device context for painting

		SendMessage(WM_ICONERASEBKGND, reinterpret_cast<WPARAM>(dc.GetSafeHdc()), 0);

		// Center icon in client rectangle
		int cxIcon = GetSystemMetrics(SM_CXICON);
		int cyIcon = GetSystemMetrics(SM_CYICON);
		CRect rect;
		GetClientRect(&rect);
		int x = (rect.Width() - cxIcon + 1) / 2;
		int y = (rect.Height() - cyIcon + 1) / 2;

		// Draw the icon
		dc.DrawIcon(x, y, m_hIcon);
	}
	else
	{
		CDialog::OnPaint();
	}
}

// The system calls this function to obtain the cursor to display while the user drags
//  the minimized window.
HCURSOR CCTreeCtrlXMLDlg::OnQueryDragIcon()
{
	return static_cast<HCURSOR>(m_hIcon);
}

void CCTreeCtrlXMLDlg::OnBnClickedButtonLoad()
{
	if( m_demoTree.LoadFromXML( "tree.xml" ) )
	{
		MessageBox( "Data was successfully loaded from file \"tree.xml\"!", "Yup!", MB_ICONINFORMATION );
	}
	else
	{
		MessageBox( "Could not load XML file!\n"
				    "Please make sure that a valid XML file called \"tree.xml\" is present!", "Aaarrgh ...", MB_ICONSTOP );
	}
}

void CCTreeCtrlXMLDlg::OnBnClickedButtonSave()
{
	m_demoTree.SaveToXML( "save.xml" );
	
	MessageBox( "Tree view was saved into a new file \"save.xml\"!", "Yup!", MB_ICONINFORMATION );
}

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This article, along with any associated source code and files, is licensed under The Code Project Open License (CPOL)

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About the Author

Andreas Loeffler
Web Developer
Germany Germany
I was born in 1982 near Stuttgart / Germany and began my first steps in programming computers at the age of only nine years on an old Commodore CBM 7072. In 2002 I finished my education as IT specialist for software engineering and did my civillian service afterwards. Currently I'm working as leader of the software division in a bigger company located in south west Germany, mainly on software development and research projects for multimedia terminals and user recognition/verification systems.

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