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Multiple Selection in a File Dialog

, 23 Nov 2002 CPOL
Shows how to do multiple file selection in a file dialog without having to worry about the size of the buffers
// MultiSelectDlg.cpp : implementation file
//

#include "stdafx.h"
#include "MultiSelect.h"
#include "MultiSelectDlg.h"
#include "FECFileDialog.h"

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

/////////////////////////////////////////////////////////////////////////////
// CAboutDlg dialog used for App About

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

// Dialog Data
	//{{AFX_DATA(CAboutDlg)
	enum { IDD = IDD_ABOUTBOX };
	//}}AFX_DATA

	// ClassWizard generated virtual function overrides
	//{{AFX_VIRTUAL(CAboutDlg)
	protected:
	virtual void DoDataExchange(CDataExchange* pDX);    // DDX/DDV support
	//}}AFX_VIRTUAL

// Implementation
protected:
	//{{AFX_MSG(CAboutDlg)
	//}}AFX_MSG
	DECLARE_MESSAGE_MAP()
};

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

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

BEGIN_MESSAGE_MAP(CAboutDlg, CDialog)
	//{{AFX_MSG_MAP(CAboutDlg)
		// No message handlers
	//}}AFX_MSG_MAP
END_MESSAGE_MAP()

/////////////////////////////////////////////////////////////////////////////
// CMultiSelectDlg dialog

CMultiSelectDlg::CMultiSelectDlg(CWnd* pParent /*=NULL*/)
	: CDialog(CMultiSelectDlg::IDD, pParent)
{
	//{{AFX_DATA_INIT(CMultiSelectDlg)
		// NOTE: the ClassWizard will add member initialization here
	//}}AFX_DATA_INIT
	// Note that LoadIcon does not require a subsequent DestroyIcon in Win32
	m_hIcon = AfxGetApp()->LoadIcon(IDR_MAINFRAME);
}

void CMultiSelectDlg::DoDataExchange(CDataExchange* pDX)
{
	CDialog::DoDataExchange(pDX);
	//{{AFX_DATA_MAP(CMultiSelectDlg)
	DDX_Control(pDX, IDC_STATIC1, m_static);
	DDX_Control(pDX, IDC_LIST1, m_listbox);
	//}}AFX_DATA_MAP
}

BEGIN_MESSAGE_MAP(CMultiSelectDlg, CDialog)
	//{{AFX_MSG_MAP(CMultiSelectDlg)
	ON_WM_SYSCOMMAND()
	ON_WM_PAINT()
	ON_WM_QUERYDRAGICON()
	ON_BN_CLICKED(IDC_BUTTON1, OnButton1)
	//}}AFX_MSG_MAP
END_MESSAGE_MAP()

/////////////////////////////////////////////////////////////////////////////
// CMultiSelectDlg message handlers

BOOL CMultiSelectDlg::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
    m_static.SetWindowText(_T("0 files selected"));
	
	return TRUE;  // return TRUE  unless you set the focus to a control
}

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

		SendMessage(WM_ICONERASEBKGND, (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 to obtain the cursor to display while the user drags
//  the minimized window.
HCURSOR CMultiSelectDlg::OnQueryDragIcon()
{
	return (HCURSOR) m_hIcon;
}

void CMultiSelectDlg::OnOK() 
{
}

void CMultiSelectDlg::OnButton1() 
{
    m_listbox.ResetContent();
    m_static.SetWindowText(_T("0 files selected"));


	CFECFileDialog fd(TRUE,
                      NULL,
                      NULL, 
                      OFN_ALLOWMULTISELECT | OFN_NODEREFERENCELINKS | OFN_EXPLORER);
    
    if (fd.DoModal() == IDOK)
    {
        int width = 0;
        CString str;
        CDC *pDC = m_listbox.GetDC();
        int saved = pDC->SaveDC();
        pDC->SelectObject(GetFont());

        UINT count = 0;

        POSITION pos = fd.GetStartPosition();
        while (pos)
        {
            str = fd.GetNextPathName(pos);
            m_listbox.AddString(str);
            CSize size(0, 0);
            size = pDC->GetTextExtent(str);
            width = width > size.cx ? width : size.cx;
            ++count;
        }
        pDC->RestoreDC(saved);
        ReleaseDC(pDC);
        m_listbox.SetHorizontalExtent(width + 5);

        str.Format(_T("%u files selected"), count);
        m_static.SetWindowText(str);
    }
}

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PJ Arends
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Canada Canada
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