Visual C++ and MFC Programming 2nd Edition

Index Visual C++ and MFC Fundamentals

10. Display the dialog box. Double-click the Calculate button. Accept the suggested
    name of the function and click OK


11. Implement the event as follows:

// MFCExtTestDlg.cpp : implementation file

//

#include "stdafx.h"

#include "MFCExtTest.h"

#include "MFCExtTestDlg.h"

#include "mfcextent.h"

#ifdef _DEBUG

#define new DEBUG_NEW

#undef THIS_FILE

static char THIS_FILE[] = __FILE__;

#endif

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

// CMFCExtTestDlg dialog

CMFCExtTestDlg::CMFCExtTestDlg(CWnd* pParent /*=NULL*/)

: CDialog(CMFCExtTestDlg::IDD, pParent)

{

//{{AFX_DATA_INIT(CMFCExtTestDlg)

m_Number1 = _T("0.00");

m_Number2 = _T("0.00");

m_Result = _T("0.00");

//}}AFX_DATA_INIT

m_hIcon = AfxGetApp()->LoadIcon(IDR_MAINFRAME);

}

...

void CMFCExtTestDlg::OnCalculateBtn()

{

// TODO: Add your control notification handler code here

double Number1, Number2, Result;

UpdateData();

// Evaluate the content of each operand edit box

if( MFCExtensions::IsNumeric(m_Number1) == TRUE )

{

Number1 = MFCExtensions::StringToFloat(m_Number1);

}

else

{

AfxMessageBox("Invalid Number");

Number1 = 0.00;

}

if( MFCExtensions::IsNumeric(m_Number2) == TRUE )

{

Number2 = MFCExtensions::StringToFloat(m_Number2);

}

else

{