Visual C++ and MFC Programming 2nd Edition

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

{

// TODO: Add your command handler code here

char NewTitle[] = "Introduction to Windows Programming";

SendMessage(WM_SETTEXT, NULL, reinterpret_cast<LPARAM>(NewTitle));

}

To retrieve the name of a window (always remember that the name of a window is not

the name of a class) or the text stored in a control, you can call the

CWnd::GetWindowText() function. Its syntax is:

int GetWindowText(LPTSTR lpszStringBuf, int nMaxCount) const;

The lpszStringBuf is the null-terminated string that will store the window name. The

nMaxCount is the minimum number of characters of the lpszStringBuf. If you specify

more characters than the name is made of, the compiler would reduce this number to the

actual length of the string. Therefore, it is safe to provide a high number.

Practical Learning: Changing a Control’s Text

1. The Geometry application should still be opened.
   To perform window text operations, change the Quadrilateral.cpp source file as
   follows:

// Quadrilateral.cpp : implementation file

//

...

// CQuadrilateral message handlers

BOOL CQuadrilateral::OnInitDialog()

{

CPropertyPage::OnInitDialog();

// 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_SquareSide.SetWindowText("0.00");

m_SquarePerimeter.SetWindowText("0.00");

m_SquareArea.SetWindowText("0.00");

m_RectLength.SetWindowText("0.00");

m_RectHeight.SetWindowText("0.00");

m_RectPerimeter.SetWindowText("0.00");

m_RectArea.SetWindowText("0.00");

return TRUE; // return TRUE unless you set the focus to a control

}

...

void CQuadrilateral::OnBnClickedBtnScalc()

{