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A drop-in replacement for MessageBox()

, 4 Jan 2005
Other articles describe replacements for MessageBox() with extra buttons for "Yes to All" and "No to All", but you still have to write the code to handle those buttons. This article presents a class that does all the work for you.
crhyesnotoalldialogapp.zip
CRHYesNoToAllDialogApp.dsp
CRHYesNoToAllDialogApp.dsw
Release
CRHYesNoToAllDialogApp.exe
res
CRHYesNoToAllDialogApp.ico
// CRHYesNoToAllDialogAppDlg.cpp : implementation file
//

#include "stdafx.h"
#include "CRHYesNoToAllDialogApp.h"
#include "CRHYesNoToAllDialogAppDlg.h"

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

/////////////////////////////////////////////////////////////////////////////

#include "CRHYesNoToAllDialog.h"

enum
{
    COLUMN_NUMBERS,
};

/////////////////////////////////////////////////////////////////////////////
// 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()

/////////////////////////////////////////////////////////////////////////////
// CRHYesNoToAllDialogAppDlg dialog

CRHYesNoToAllDialogAppDlg::CRHYesNoToAllDialogAppDlg(CWnd* pParent /*=NULL*/)
	: CDialog(CRHYesNoToAllDialogAppDlg::IDD, pParent)
{
	//{{AFX_DATA_INIT(CRHYesNoToAllDialogAppDlg)
	v_NumberOfLines = 1000;
	//}}AFX_DATA_INIT
	// Note that LoadIcon does not require a subsequent DestroyIcon in Win32
	m_hIcon = AfxGetApp()->LoadIcon(IDR_MAINFRAME);
}

void CRHYesNoToAllDialogAppDlg::DoDataExchange(CDataExchange* pDX)
{
	CDialog::DoDataExchange(pDX);
	//{{AFX_DATA_MAP(CRHYesNoToAllDialogAppDlg)
	DDX_Control(pDX, IDC_BUTTON_MESSAGEBOX, c_CButton_MessageBox);
	DDX_Control(pDX, IDC_BUTTON_CRHMESSAGEBOX, c_CButton_CRHMessageBox);
	DDX_Control(pDX, IDC_THE_LIST, c_TheList);
	DDX_Text(pDX, IDC_EDIT_NUMBER_OF_LINES, v_NumberOfLines);
	//}}AFX_DATA_MAP
}

BEGIN_MESSAGE_MAP(CRHYesNoToAllDialogAppDlg, CDialog)
	//{{AFX_MSG_MAP(CRHYesNoToAllDialogAppDlg)
	ON_WM_SYSCOMMAND()
	ON_WM_PAINT()
	ON_WM_QUERYDRAGICON()
	ON_BN_CLICKED(IDC_BUTTON_MESSAGEBOX, OnButtonMessageBox)
	ON_BN_CLICKED(IDC_BUTTON_CWNDMESSAGEBOX, OnButtonCWndMessageBox)
	ON_BN_CLICKED(IDC_BUTTON_CRHMESSAGEBOX, OnButtonCRHMessageBox)
	//}}AFX_MSG_MAP
END_MESSAGE_MAP()

/////////////////////////////////////////////////////////////////////////////
// CRHYesNoToAllDialogAppDlg message handlers

BOOL CRHYesNoToAllDialogAppDlg::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
// vvv CRH
        c_TheList.InsertColumn(COLUMN_NUMBERS, "");

        SetDefID(IDC_BUTTON_CRHMESSAGEBOX);
        GotoDlgCtrl(&c_CButton_CRHMessageBox);
        return(FALSE);
// ^^^ CRH
	
	//CRH return TRUE;  // return TRUE  unless you set the focus to a control
}

void CRHYesNoToAllDialogAppDlg::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 CRHYesNoToAllDialogAppDlg::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 CRHYesNoToAllDialogAppDlg::OnQueryDragIcon()
{
	return (HCURSOR) m_hIcon;
}

/////////////////////////////////////////////////////////////////////////////

void CRHYesNoToAllDialogAppDlg::PrepareTheQuestion(int i, CString *pCString) 
{
    pCString->Format("Ok to add %i to list?", i);
    for (int j = 2; j <= i % 100; j++)
    {
        *pCString += " blah";
        if ((j % 20) == 0)
            *pCString += "\n";
    }
}

void CRHYesNoToAllDialogAppDlg::AddToList(int i) 
{
    CString vCString;
    vCString.Format("%i", i);

    LVITEM vLVITEM;
    vLVITEM.mask = LVIF_TEXT | LVIF_PARAM;  
    vLVITEM.iItem = i; 
    vLVITEM.iSubItem = COLUMN_NUMBERS; 
    vLVITEM.pszText = vCString.GetBuffer(vCString.GetLength());
        // see samples\VC98\mfc\general\LISTHDR\LHdrDlg.cpp
    vLVITEM.cchTextMax = 0;
    vLVITEM.lParam = (LPARAM)NULL;

    int ItemNumber = c_TheList.InsertItem(&vLVITEM);

    c_TheList.EnsureVisible(ItemNumber, false);
    UpdateWindow();
}

void CRHYesNoToAllDialogAppDlg::OnButtonMessageBox() 
{
	// TODO: Add your control notification handler code here
// vvv CRH
    UpdateData(true);  // get v_NumberOfLines from the control
    c_TheList.DeleteAllItems();
    UseMessageBox(v_NumberOfLines);
// ^^^ CRH
}

void CRHYesNoToAllDialogAppDlg::OnButtonCWndMessageBox() 
{
	// TODO: Add your control notification handler code here
// vvv CRH
    UpdateData(true);  // get v_NumberOfLines from the control
    c_TheList.DeleteAllItems();
    UseCWndMessageBox(v_NumberOfLines);
// ^^^ CRH
}

void CRHYesNoToAllDialogAppDlg::OnButtonCRHMessageBox() 
{
	// TODO: Add your control notification handler code here
// vvv CRH
    UpdateData(true);  // get v_NumberOfLines from the control
    c_TheList.DeleteAllItems();
    UseCRHYesNoToAllDialog(v_NumberOfLines);
// ^^^ CRH
}

void CRHYesNoToAllDialogAppDlg::UseMessageBox(int NLines) 
{
    CString vCString;

    for (int i = 1; i <= NLines; i++)
    {
        PrepareTheQuestion(i, &vCString);
        int rc = ::MessageBox(m_hWnd, vCString, 
                              "::MessageBox", 
                              MB_ICONQUESTION | MB_YESNOCANCEL);
        if (rc == IDCANCEL)
            break;
        if (rc == IDYES)
            AddToList(i);
    }
}

void CRHYesNoToAllDialogAppDlg::UseCWndMessageBox(int NLines) 
{
    CString vCString;

    for (int i = 1; i <= NLines; i++)
    {
        PrepareTheQuestion(i, &vCString);
        int rc = MessageBox(vCString, 
                            "CWnd::MessageBox", 
                            MB_ICONQUESTION | MB_YESNOCANCEL);
        if (rc == IDCANCEL)
            break;
        if (rc == IDYES)
            AddToList(i);
    }
}

void CRHYesNoToAllDialogAppDlg::UseCRHYesNoToAllDialog(int NLines) 
{
    CString vCString;

    CRHYesNoToAllDialog db(false, this);
    for (int i = 1; i <= NLines; i++)
    {
        PrepareTheQuestion(i, &vCString);
        int rc = db.CRHMessageBox(vCString, 
                                  "CRHYesNoToAllDialog::CRHMessageBox", 
                                  MB_ICONQUESTION | MB_YESNOCANCEL);
        if (rc == IDCANCEL)
            break;
        if (rc == IDYES)
            AddToList(i);
        db.CRHUpdateProgressBar(i, NLines);
    }
    
    // db goes out of scope and the CRHMessageBox disappears
}

// vvv CRH
// ^^^ CRH

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About the Author

Chris Hills
Software Developer (Senior)
United Kingdom United Kingdom
I've been programming computers since about 1968. I started at school with Algol 60 on an Elliott 803. From there I progressed through the Z80 and other microprocessors to the PC, DOS and Windows, Pascal, C and C++.
 
My other interests include astronomy and classical music. All of my contributions to Code Project have arisen from programs I've written in these areas.

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