Visual C++ and MFC Programming 2nd Edition

Chapter 15: Fundamental Controls Visual C++ and MFC Fundamentals

Practical Learning: Updating Controls Data

1. To see examples of updating data, implement the events of the Circular.cpp source
   file as follows:

// Circular.cpp : implementation file

//

#include "stdafx.h"

#include "Geometry1.h"

#include "Circular.h"

const double PIValue = 3.14159;

// CCircular dialog

IMPLEMENT_DYNAMIC(CCircular, CPropertyPage)

CCircular::CCircular()

: CPropertyPage(CCircular::IDD)

, m_szCircleRadius(_T("0.00"))

, m_szCircleCircumference(_T("0.00"))

, m_szCircleArea(_T("0.00"))

, m_szEllipseradius(_T("0.00"))

, m_szEllipseRadius(_T("0.00"))

, m_szEllipseCircumference(_T("0.00"))

, m_szEllipseArea(_T("0.00"))

{

}

CCircular::~CCircular()

{

}

void CCircular::DoDataExchange(CDataExchange* pDX)

{

CPropertyPage::DoDataExchange(pDX);

DDX_Text(pDX, IDC_EDT_CRADIUS, m_szCircleRadius);

DDX_Text(pDX, IDC_EDT_CCIRC, m_szCircleCircumference);

DDX_Text(pDX, IDC_EDT_CAREA, m_szCircleArea);

DDX_Text(pDX, IDC_EDT_VRADIUS, m_szEllipseradius);

DDX_Text(pDX, IDC_EDT_HRADIUS, m_szEllipseRadius);

DDX_Text(pDX, IDC_EDT_CCIRC2, m_szEllipseCircumference);

DDX_Text(pDX, IDC_EDT_EAREA, m_szEllipseArea);

}

BEGIN_MESSAGE_MAP(CCircular, CPropertyPage)

ON_BN_CLICKED(IDC_BTN_CCALC, OnBnClickedBtnCcalc)

ON_BN_CLICKED(IDC_BTN_ECALC, OnBnClickedBtnEcalc)

END_MESSAGE_MAP()

// CCircular message handlers

void CCircular::OnBnClickedBtnCcalc()

{

// TODO: Add your control notification handler code here

UpdateData();

double Radius, Circumference, Area;

Radius = atof(m_szCircleRadius);