Visual C++ and MFC Programming 2nd Edition

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

Circumference = Radius * 2 * PIValue;

Area = Radius * Radius * PIValue;

m_szCircleCircumference.Format("%.3f", Circumference);

m_szCircleArea.Format("%.3f", Area);

UpdateData(FALSE);

}

void CCircular::OnBnClickedBtnEcalc()

{

// TODO: Add your control notification handler code here

UpdateData();

double radius, Radius, Circumference, Area;

radius = atof(m_szEllipseradius);

Radius = atof(m_szEllipseRadius);

Circumference = (radius + Radius) * PIValue;

Area = radius * Radius * PIValue;

m_szEllipseCircumference.Format("%.3f", Circumference);

m_szEllipseArea.Format("%.3f", Area);

UpdateData(FALSE);

}

2. Test the application by changing the values of the Circular property pages


3. After using it, close the application and return to MSVC

14.2.8..Window’s Focus..................................................................................

A control is said to have focus if it is ready to receive input from the user. For example, if

a text control, such as an edit box, has focus and the user presses a character key, the

corresponding character would be displayed in the control.

Controls show different ways of having focus. For example, when an edit box has focus,

a caret is blinking in it:

When a button has focus, it displays a dotted rectangle around its caption:

There are two main ways a control receives focus: based on a user’s action or an explicit

request from you. To give focus to a control, the user usually presses Tab, which allows

navigating from one control to another. To programmatically give focus to a control, call

the CWnd::SetFocus() method.

CWnd* SetFocus( );